CVE-2026-15917 Drupal core - Moderately critical - Cross-site scripting - SA-CORE-2026-011
An attacker 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
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-15917?
CVE-2026-15917 is a medium-severity cross-site scripting vulnerability in Drupal core, published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, 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 11.3.0 to 11.3.14, from 11.4.0 to 11.4.4, from 0.0.0 to 11.2.*.
Weakness: CWE-79
Which versions are affected by CVE-2026-15917?
1 open source package ship an affected version, including drupal/core.
| Package | Affected | Fixed in |
|---|---|---|
drupal/core Packagist | From 11.3.0 | 11.3.14, 11.4.4, 11.3.0 |
How do I fix CVE-2026-15917?
Upgrade drupal/core to a fixed version for your release line: 11.3.14, 11.4.4 or 11.3.0.
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-2026-15917 being exploited?
There is no known exploitation of CVE-2026-15917 in the wild and no public exploit code.
Sources
Also known as DRUPAL-CORE-2026-011, GHSA-pw57-w545-279f.