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Vulnerability Database · Go · Package report

github.com/mattermost/mattermost-server: vulnerability history, versions and safety

github.com/mattermost/mattermost-server is a package in the Go ecosystem. Vulert records 402 vulnerabilities for it across 120 releases, from May 2022 to Oct 2026. Each vulnerability names the versions it affects, the fixed version to move to, and a workaround where no fix has been published.

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402 vulnerabilities recorded C8 H22 M88 L17 U267
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34 with no fix published

No patched version yet — these are the ones to plan around.

See the unfixed vulnerabilities →
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190 in the last 12 months

Most recent disclosure 01 Oct 2026.

See the disclosure history →
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0 malicious-package vulnerabilities

No published version shipped hostile code.

See all github.com/mattermost/mattermost-server vulnerabilities

Vulert verdict on github.com/mattermost/mattermost-server v11.9.0+incompatible i

Updated on 23 Oct 2026

Careful: v11.9.0+incompatible has 160 known vulnerabilities, and 33 have no fix yet. Use an earlier safe version, or the workaround listed for each one.

Package health score 50/100
  • Security Unfixed issues
  • Maintenance Sustainable
  • Popularity Key ecosystem project
  • Community Active

The current release has a vulnerability with no published fix, which caps this score.

What to do: Pin an earlier, unaffected release if you can, and apply the workaround each vulnerability lists until a fix is published. No fix yet: Vulert alerts you the moment one is published. Monitor it with Vulert →

  • Current release v11.9.0+incompatible — affected i
  • Vulnerabilities on record 402 over 4 years · 190 in the last year i
  • Latest disclosure 01 Oct 2026 i
  • Highest CVSS 9.9 i
  • With no published fix 34 i
  • Stars 39,345 i
  • OpenSSF scorecard 7/10 i
  • Last release 3 months ago i
  • Licence Apache-2.0 i

Version list, release dates, licence and dependants published by the Go module proxy, refreshed 22 Oct 2026. Licence information is not legal advice.

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01 Versions

Which versions are affected

Every version Vulert tracks for github.com/mattermost/mattermost-server, newest first, with the vulnerabilities recorded against each one. A version showing none has no vulnerability in the Vulert database — open it for the full picture on that release.

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Version Released Vulert vulnerabilities Licence Fix published Details
v11.7.12+incompatible 07 Oct 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.7.12-rc2+incompatible 07 Oct 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.7.12-rc1+incompatible 07 Oct 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v10.11.24+incompatible 15 Sep 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.7.11+incompatible 11 Sep 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.7.11-rc1+incompatible 11 Sep 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.9.2+incompatible 10 Sep 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.7.10+incompatible 26 Aug 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.7.9+incompatible 12 Aug 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.8.5+incompatible 06 Aug 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.8.5-rc1+incompatible 06 Aug 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.9.1+incompatible 06 Aug 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.9.1-rc1+incompatible 06 Aug 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v10.11.23+incompatible 03 Aug 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v10.11.23-rc1+incompatible 03 Aug 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.7.8+incompatible 31 Jul 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v10.11.22+incompatible 16 Jul 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.7.7+incompatible 16 Jul 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.8.4+incompatible 16 Jul 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.9.0+incompatible 07 Jul 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.8.3+incompatible 06 Jul 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260701191739-be8f7fe02f65+incompatible 01 Jul 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.9.0-rc3+incompatible 01 Jul 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260630030143-743b565c2d24 30 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260626205434-1efe1aa9bb2e 26 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260626205434-1efe1aa9bb2e+incompatible 26 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v5.3.2-0.20260626044829-3a74d782a816+incompatible 26 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260625173137-2d05d063711f 25 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v10.11.21+incompatible 25 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.6.6+incompatible 25 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.9.0-rc2+incompatible 25 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.7.6+incompatible 25 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260624173351-54ecdfd7ab32 24 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v5.3.2-0.20260624173351-54ecdfd7ab32+incompatible 24 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.8.2+incompatible 23 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260619183049-ee04f28e873d 19 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260619183049-ee04f28e873d+incompatible 19 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260618204351-017a7102f82e 18 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.9.0-rc1+incompatible 18 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260618053512-b3e2e8b8e4f7 18 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260617212206-9defd980928b 17 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260617133811-ffb86ddcae52+incompatible 17 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260616133502-c48a6df9106b 16 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.7.5+incompatible 16 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.7.5-rc1+incompatible 16 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260615165741-d90ea343bcc2 15 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.8.1+incompatible 15 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.7.4+incompatible 15 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260614162140-162322cc4ce0 14 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260614162140-162322cc4ce0+incompatible 14 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260613221023-d081ae0c9e8b 13 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260613221023-d081ae0c9e8b+incompatible 13 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260612231341-d41865371704 12 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260612231341-d41865371704+incompatible 12 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260612213916-46417611228d+incompatible 12 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260612154521-20c4cc42b2ee 12 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260611213115-5cbbb76b7b25 11 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260611201736-2db07164df09 11 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260611170227-80eb49802dcb 11 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260611145944-d5415c0a0dd1 11 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v5.3.2-0.20260611145944-d5415c0a0dd1+incompatible 11 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.7.3+incompatible 11 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.6.5+incompatible 11 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260611113943-d562481f82ad 11 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260610160753-8a267c8ababd+incompatible 10 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v10.11.20+incompatible 10 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260608191646-b7dda3435c3f 08 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260605163709-ff01f820439f 05 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.8.0+incompatible 05 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.8.0-rc5+incompatible 05 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260604070122-563e1a951da9+incompatible 04 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260603161545-fb8cfbaef761 03 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260603161545-fb8cfbaef761+incompatible 03 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v5.3.2-0.20260602201155-1e0bdaf068ef+incompatible 02 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260602201155-1e0bdaf068ef+incompatible 02 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260602192405-6ef5d58b7f12+incompatible 02 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260602181712-9d27c06085d2+incompatible 02 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260602142958-8e8b807a4291+incompatible 02 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v5.3.2-0.20260602131159-127552ce8420+incompatible 02 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260602131159-127552ce8420+incompatible 02 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260602101635-1b3dc637845e 02 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v5.3.2-0.20260602101635-1b3dc637845e+incompatible 02 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260602101635-1b3dc637845e+incompatible 02 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v5.3.2-0.20260602084825-6c401066f734+incompatible 02 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260602084825-6c401066f734+incompatible 02 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.8.0-rc4+incompatible 02 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260602054355-a84032f40a6a+incompatible 02 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260601160305-a57695daa3e9+incompatible 01 Jun 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260529163454-bcf511968217 29 May 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v10.11.19+incompatible 27 May 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260526165234-41367fa7b17c 26 May 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260526055117-1e98d75e80ec+incompatible 26 May 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.7.2+incompatible 26 May 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260525214903-099a18b84e3b+incompatible 25 May 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.6.4+incompatible 25 May 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v11.5.7+incompatible 25 May 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v10.11.19-rc1+incompatible 25 May 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v0.0.0-20260522184444-7e75035cb676 22 May 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v8.0.0-20260522184444-7e75035cb676+incompatible 22 May 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v5.3.2-0.20260522160503-44ba06ee3c8b+incompatible 22 May 2026 C8 H13 M47 L2 U90 Apache-2.0 No Details →
v5.3.2-0.20260522135915-c63154598c61+incompatible 22 May 2026 C8 H13 M47 L2 U90 — No Details →
v11.8.0-rc3+incompatible 22 May 2026 C8 H13 M47 L2 U90 — No Details →
v5.3.2-0.20260522085337-b4aa46a4be5f+incompatible 22 May 2026 C8 H13 M47 L2 U90 — No Details →
v5.3.2-0.20260521232339-6ee3fb9af191+incompatible 21 May 2026 C8 H13 M47 L2 U90 — No Details →
v8.0.0-20260521232339-6ee3fb9af191+incompatible 21 May 2026 C8 H13 M47 L2 U90 — No Details →
v11.6.3+incompatible 21 May 2026 C8 H13 M47 L2 U90 — No Details →
v0.0.0-20260520221954-981e5341ca86 20 May 2026 C8 H13 M47 L2 U90 — No Details →
v10.11.18+incompatible 20 May 2026 C8 H13 M47 L2 U90 — No Details →
v11.5.6+incompatible 20 May 2026 C8 H13 M47 L2 U90 — No Details →
v11.8.0-rc2+incompatible 20 May 2026 C8 H13 M47 L2 U90 — No Details →
v11.7.1+incompatible 19 May 2026 C8 H13 M47 L2 U90 — No Details →
v0.0.0-20260519141200-5566604e030b 19 May 2026 C8 H13 M47 L2 U90 — No Details →
v0.0.0-20260519135531-5cd26002d3e9 19 May 2026 C8 H13 M47 L2 U90 — No Details →
v0.0.0-20260519132204-92f6870a2b97 19 May 2026 C8 H13 M47 L2 U90 — No Details →
v0.0.0-20260519090425-0675d0ea0b38 19 May 2026 C8 H13 M47 L2 U90 — No Details →
v11.8.0-rc1+incompatible 19 May 2026 C8 H13 M47 L2 U90 — No Details →
v0.0.0-20260516022600-8eb97fa6c396 16 May 2026 C8 H13 M47 L2 U90 — No Details →
v0.0.0-20260514212937-d4fc0ecb1c35 14 May 2026 C8 H13 M47 L2 U90 — No Details →
v5.3.2-0.20260514212937-d4fc0ecb1c35+incompatible 14 May 2026 C8 H13 M47 L2 U90 — No Details →
v0.0.0-20260512080842-5c21fbbc0f91 12 May 2026 C8 H13 M47 L2 U90 — No Details →

The newest 120 of 2,386 versions Vulert tracks. Severity counts are the vulnerabilities recorded against that exact release.

02 Disclosure history

How often vulnerabilities are recorded

  • 2022 65
  • 2023 2
  • 2024 64
  • 2025 140
  • 2026 131

Counted by the year Vulert recorded each vulnerability — the same date the table below shows as disclosed. 190 of the 402 were recorded in the last 12 months.

03 Vulnerabilities

Recorded vulnerabilities for github.com/mattermost/mattermost-server

The 5 most severe of 402 vulnerabilities recorded for this package

Search all 402 in the database →
Vulnerability Severity Fixed version ↓ Disclosed ↓
CVE-2025-4981: Mattermost Arbitrary File Write Vulnerability 9.9 critical 0.0.0-20250519205859-65aec10162f6 20 Jun 2025
CVE-2017-18885: Mattermost Server Privilege Escalation via Unintended API Endpoints 9.8 critical 4.1.2 24 May 2022
CVE-2017-18915: Mattermost Server API Access Vulnerability Post-Restart 9.8 critical 3.6.7-0.20170420152529-0968e4079e0a 24 May 2022
CVE-2017-18908: Mattermost Server Password Reset Email Vulnerability 9.8 critical 3.9.1-rc1 24 May 2022
CVE-2017-18888: Mattermost Server SQL Injection Vulnerability in Multiple POST Requests 9.8 critical 4.1.2 24 May 2022

Vulnerability wrong, a fix missing, or a package we should cover? Report it and we will fix the record. Report Vulnerability Provide Feedback

Updated: 23/Oct/2026 · Vulnerabilities in our DB: 524315

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Questions

About github.com/mattermost/mattermost-server

Is github.com/mattermost/mattermost-server safe to use?

Vulert records 402 vulnerabilities for github.com/mattermost/mattermost-server in Go: 8 critical, 22 high, 88 medium and 17 low, plus 267 not yet rated. 34 of them have no published fix yet, so those are the ones to avoid or mitigate.

What is github.com/mattermost/mattermost-server's Vulert package health score?

Vulert scores github.com/mattermost/mattermost-server 50/100, which reads as usable, but worth attention. The score weighs the vulnerability record (40), maintenance and release cadence (25), adoption from dependents and stars (20) and community signals such as the OpenSSF scorecard and forks (15). The current release has a vulnerability with no published fix, which caps this score.

Is the latest version of github.com/mattermost/mattermost-server affected?

Yes. v11.9.0+incompatible, the version you would install today, has 160 known vulnerabilities, and 33 has no published fix yet. Use an earlier unaffected release, or the workaround each vulnerability lists.

Which version of github.com/mattermost/mattermost-server should I use?

v11.9.0+incompatible is the version Vulert recommends for the affected releases. The version table above lists every release with the vulnerabilities recorded against it, so you can confirm the range you actually run.

How many vulnerabilities does github.com/mattermost/mattermost-server have?

402 vulnerabilities are recorded for github.com/mattermost/mattermost-server in the Go ecosystem: 8 critical, 22 high, 88 medium and 17 low, plus 267 not yet rated. The ledger on this page lists the same counts next to the date of the most recent disclosure.

How often are new github.com/mattermost/mattermost-server vulnerabilities disclosed?

190 vulnerabilities were recorded for github.com/mattermost/mattermost-server in the last 12 months, and the oldest entry in this database dates to 24 May 2022. Recency matters more than a lifetime total: it shows how actively new issues are being disclosed for the package you are considering.

Which versions of github.com/mattermost/mattermost-server are affected?

Each vulnerability on this page lists the affected version range and the fixed version to move to. Open the vulnerability for the version you actually run — fixes are specific to a release line, not to the package as a whole.

How do I monitor github.com/mattermost/mattermost-server for upcoming vulnerabilities?

Upload the manifest or SBOM for your application at vulert.com/scanner and Vulert keeps checking the github.com/mattermost/mattermost-server version you actually run against new disclosures, then alerts you when one affects it. There is no installation and no source-code access required.