CVE-2026-55807: Drupal Core Media Module oEmbed URL Discovery Vulnerability

drupal/core Updated 17 Jun 2026

Summary

17/06/2026

Disclosed on

CVE-2026-55807

CVE

Yes i

Fix available

Unrated

Severity

Not published

CVSS Score

CVE-2026-55807: The Media module comes with support for oEmbed. Affects drupal/core across 6 version ranges.

< 10.5.12 >= 10.6.0, < 10.6.11 >= 11.0.0, < 11.1.0 >= 11.1.0, < 11.2.0 >= 11.2.0, < 11.2.14 >= 11.3.0, < 11.3.12

Fixed in 6 releases; the minimum fixed version depends on the release line you run. How to fix ↓

Also tracked for

drupal · Bitnami

The same CVE-2026-55807 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.

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Background

Drupal is a popular open-source content management system (CMS) that allows users to create and manage websites. The Media module in Drupal provides support for embedding external content through oEmbed, a format that allows for easy integration of media from various providers. This functionality enhances user experience by allowing seamless media integration. However, the oEmbed specification includes mechanisms for URL discovery, which can be exploited if not properly secured.

Vulnerability Detail

The vulnerability arises from the URL discovery feature of the oEmbed implementation in the Media module of Drupal. This feature can be manipulated to trick Drupal into making unauthorized server-side requests to arbitrary URLs. Such exploitation could lead to various security issues, including data leakage, server-side request forgery (SSRF), and potential access to sensitive information. The vulnerability affects multiple versions of Drupal core, making it critical for users to address it promptly.

How To Fix

Fixed versions by release line

The minimum fixed version depends on the release line you run.

< 10.5.12 10.5.12
```
composer require drupal/core:10.5.12
```
>= 10.6.0, < 10.6.11 10.6.11
```
composer require drupal/core:10.6.11
```
>= 11.0.0, < 11.1.0 11.1.0
```
composer require drupal/core:11.1.0
```
>= 11.1.0, < 11.2.0 11.2.0
```
composer require drupal/core:11.2.0
```
>= 11.2.0, < 11.2.14 11.2.14
```
composer require drupal/core:11.2.14
```
>= 11.3.0, < 11.3.12 11.3.12
```
composer require drupal/core:11.3.12
```

Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →

Workaround

If you cannot update immediately, consider disabling the Media module or restricting access to the oEmbed functionality until a patch can be applied. This can be done by navigating to the module settings in your Drupal admin interface and disabling the Media module temporarily.

Conclusion

The CVE-2026-55807 vulnerability in the Drupal Core Media module poses significant risks due to its exploitation potential through the oEmbed URL discovery feature. It is crucial for users to update their installations to the latest patched versions to mitigate these risks. Regular monitoring and updates are essential for maintaining the security of your Drupal applications.

See every vulnerability recorded for drupal/core →