What is CVE-2026-55808?

CVE-2026-55808 is a medium-severity vulnerability in Drupal, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-07-10.

How severe is CVE-2026-55808?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Drupal

CVE-2026-55808

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.*.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (19.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Drupal
Drupal Core — versions 0.0.0, 10.6.0, 11.2.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

mlhess@drupal.org (Vendor Advisory)

Frequently asked questions

What is CVE-2026-55808?: CVE-2026-55808 is a medium-severity vulnerability in Drupal, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-07-10.
How severe is CVE-2026-55808?: Medium severity. CVSS v3 base score is 5.4 out of 10.