What is CVE-2026-26274?

CVE-2026-26274 is a medium-severity vulnerability in Octobercms October, classified under Incomplete List of Disallowed Inputs. CVSS score: 6.6/10. Published 2026-04-21.

How severe is CVE-2026-26274?

Medium severity. CVSS v3 base score is 6.6 out of 10.

Auth bypass in Octobercms October

CVE-2026-26274

October is a Content Management System (CMS) and web platform. Prior to 3.7.14 and 4.1.10, a vulnerability was identified in the Twig sandbox security policy that allowed database write operations when cms.safe_mode is enabled. Backend use…

EPSS: 0.002 (13.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

Octobercms October — versions >= 4.0.0, < 4.1.10, < 3.7.14

Weakness classification (CWE)

CWE-184 — Incomplete List of Disallowed Inputs
CWE-863 — Incorrect Authorization

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-26274?: CVE-2026-26274 is a medium-severity vulnerability in Octobercms October, classified under Incomplete List of Disallowed Inputs. CVSS score: 6.6/10. Published 2026-04-21.
How severe is CVE-2026-26274?: Medium severity. CVSS v3 base score is 6.6 out of 10.