CVE-2026-55805 Drupal core - Moderately critical - Cross-site scripting - SA-CORE-2026-012
An attacker can inject malicious scripts into Drupal core pages, potentially executing code in victim browsers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-55805?
CVE-2026-55805 is a medium-severity cross-site scripting vulnerability in Drupal core, published on 25 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Drupal core allows Stored XSS. This issue affects Drupal core versions: from 0.0.0 to 10.6.13, from 11.3.0 to 11.3.14, from 11.4.0 to 11.4.4, from 0.0.0 to 11.0.*, from 0.0.0 to 11.1.*, from 0.0.0 to 11.2.*.
Weakness: CWE-79
Which versions are affected by CVE-2026-55805?
1 open source package ship an affected version, including drupal/core.
| Package | Affected | Fixed in |
|---|---|---|
drupal/core Packagist | All versions | 10.6.13, 11.3.14, 11.4.4, 11.1.0, 11.2.0, 11.3.0 |
How do I fix CVE-2026-55805?
Upgrade drupal/core to a fixed version for your release line: 10.6.13, 11.3.14, 11.4.4 or 11.1.0.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-55805 being exploited?
There is no known exploitation of CVE-2026-55805 in the wild and no public exploit code.
Sources
Also known as DRUPAL-CORE-2026-012, GHSA-vqm5-mjxv-776v.