What is CVE-2026-107263?

CVE-2026-107263 is a medium-severity vulnerability in Drupal Gutenberg, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-10-30.

How severe is CVE-2026-107263?

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

Auth bypass in Drupal Gutenberg

CVE-2026-107263

Incorrect Authorization vulnerability in Drupal Gutenberg allows Forceful Browsing. This issue affects Gutenberg versions: from 0.0.0 to 2.15.0, from 3.0.0 to 3.0.7.

Vulnerability class: Broken Access Control

Published 2026-10-30 · last modified 2026-10-30.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.001 (3.5th percentile), scored 2026-10-31.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 3.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Drupal Gutenberg

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

www.drupal.org/sa-contrib-2026-202

Frequently asked questions

What is CVE-2026-107263?: CVE-2026-107263 is a medium-severity vulnerability in Drupal Gutenberg, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-10-30.
How severe is CVE-2026-107263?: Medium severity. CVSS v3 base score is 5.4 out of 10.