CVE-2021-29652: pomerium/pomerium - Unverified pomerium_signature in middleware
Summary
CVE-2021-29652: pomerium_signature is not verified in middleware in github.com/pomerium/pomerium. Affects github.com/pomerium/pomerium versions >= 0.10.0, < 0.13.4. Fixed in 0.13.4. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
The package under scrutiny is github.com/pomerium/pomerium, an open-source project written in Go. Pomerium is an identity-aware access proxy that enables secure access to internal applications. It provides features like single sign-on (SSO) and access control policies. The vulnerability affects the pomerium_signature verification in the middleware of the package.
Vulnerability Detail
The vulnerability (CVE-2021-29652) arises from certain API endpoints under /.pomerium/ not verifying parameters with pomerium_signature. This oversight allows an attacker to modify parameters that were intended to be trusted by Pomerium. Although the issue mainly impacts sign-in/sign-out routes, it does not bypass authentication. The vulnerability has a CVSS score of 5.4, indicating a moderate severity level.
How To Fix
Latest published version: v0.33.4 as of 22 Oct 2026
go get github.com/pomerium/pomerium@v0.33.4Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
0.13.4
This is the first release that contains the fix.
go get github.com/pomerium/pomerium@v0.13.4Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no specific workaround mentioned for this vulnerability.
Conclusion
In conclusion, the vulnerability in github.com/pomerium/pomerium allows for the modification of trusted parameters, potentially leading to unauthorized access or data manipulation. It is recommended to update the package to version 0.13.4 or later to mitigate this vulnerability. For further support on vulnerability remediation, contact DevNack.com.
See every vulnerability recorded for github.com/pomerium/pomerium →
FAQ
The vulnerability allows an attacker to modify trusted parameters in Pomerium, potentially leading to unauthorized access or manipulation of data. However, it does not bypass authentication.
The vulnerability primarily affects routes responsible for sign-in/sign-out functionality.
No, this vulnerability does not bypass authentication.
The vulnerability has a CVSS score of 5.4, indicating a moderate severity level.
To fix this vulnerability, update the package to version 0.13.4 or later.
References
Related vulnerabilities
Recent vulnerabilities recorded for github.com/pomerium/pomerium.
