CVE-2026-55808 Drupal core - Moderately critical - Improper validation - SA-CORE-2026-009
Attackers can inject malicious scripts into Drupal core pages, potentially stealing user sessions or 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-2026-55808?
CVE-2026-55808 is a medium-severity cross-site scripting vulnerability in Drupal Drupal, published on 10 Jul 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 Cross-Site Scripting (XSS). This issue affects Drupal core versions: from 0.0.0 to 10.5.12, from 10.6.0 to 10.6.11, from 11.2.0 to 11.2.14, from 11.3.0 to 11.3.12, from 0.0.0 to 11.0.*, from 0.0.0 to 11.1.*.
Weakness: CWE-79
Which versions are affected by CVE-2026-55808?
2 open source packages ship an affected version, including drupal and drupal/core. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
drupal Bitnami | All versions | 10.5.12, 10.6.11, 11.2.14, 11.3.12 |
drupal/core Packagist | All versions | 10.5.12, 10.6.11, 11.2.14, 11.3.12, 11.1.0, 11.2.0 |
Products include Drupal Drupal.
How do I fix CVE-2026-55808?
Upgrade drupal to a fixed version for your release line: 10.5.12, 10.6.11, 11.2.14 or 11.3.12.
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-2026-55808 being exploited?
There is no known exploitation of CVE-2026-55808 in the wild and no public exploit code.
Other vulnerabilities in Drupal Drupal
Sources
Also known as BIT-drupal-2026-55808, DRUPAL-CORE-2026-009, GHSA-9wh5-5mcm-hf2j, MINI-mj26-78q8-f5gm, MINI-qr8x-4m3h-p2mm.