What is CVE-2026-113661?

CVE-2026-113661 is a medium-severity vulnerability in Apostrophecms Apostrophe, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-10-20.

How severe is CVE-2026-113661?

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

XSS in Apostrophecms Apostrophe

CVE-2026-113661

ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. Prior to sanitize-html 2.18.0, a non-default configuration that allows meta refresh elements and their http-equiv and content attributes can retain unsafe script or redirect destinations embedded in the refresh content value. This issue is fixed in sanitize-html 2.18.0.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-20 · last modified 2026-10-21.

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.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Apostrophecms Apostrophe — versions < 4.33.0
Apostrophecms Sanitize-Html — versions < 2.18.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-113661?: CVE-2026-113661 is a medium-severity vulnerability in Apostrophecms Apostrophe, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-10-20.
How severe is CVE-2026-113661?: Medium severity. CVSS v3 base score is 5.4 out of 10.