Stored XSS in ApostropheCMS due to inadequate color field validation
CVE-2026-112951

5.4MEDIUM

Key Information:

Vendor

Apostrophecms

Status
Apostrophe
Vendor
CVE Published:
20 October 2026

What is CVE-2026-112951?

ApostropheCMS, an open-source Node.js content management system, suffers from a vulnerability where the color field accepts trailing content after valid rgb() or hsl() prefixes. This flaw is due to inadequate validation by TinyColor, which allows authenticated users with edit permissions to embed arbitrary HTML after a valid color prefix. Once rendered, this malicious payload can execute, leading to stored XSS attacks. The issue was addressed in version 4.34.0.

Affected Version(s)

apostrophe < 4.34.0

References

https://github.com/apostrophecms/apostrophe/security/advi...
x_refsource_CONFIRM
https://github.com/apostrophecms/apostrophe/commit/06e4b3...
x_refsource_MISC
https://github.com/apostrophecms/apostrophe/commit/40b989...
x_refsource_MISC

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.