Vulnerability · Published Aug 25, 2026 · Assigned by drupal
CVE-2026-15917Drupal core - Moderately critical - Cross-site scripting - SA-CORE-2026-011
Medium 4.7
In plain English
A medium-severity cross-site scripting in Drupal core from Drupal. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.7Medium
Exploit odds (30 days)0.2%top 89.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.*.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | drupal/core | 11.3.0, 11.3.14, 11.4.4 | DRUPAL-CORE-2026-011 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Drupal | Drupal core | 11.3.0 – before 11.3.1411.4.0 – before 11.4.40.0.0 – before 11.2.* |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N