CVE-2026-112951CWE-79cross-site-scripting

CVE-2026-112951

Medium · published October 20, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
21.9
In the wild
Unconfirmed
What it is

ApostropheCMS is an open-source Node.js content management system. Prior to 4.34.0, the color field accepts trailing content after a valid rgb() or hsl() prefix because its TinyColor validation does not require the entire value to match a color. An authenticated user with edit rights can store arbitrary HTML after a valid color prefix. When the stored value is rendered, the payload executes, resulting in stored XSS. This issue is fixed in version 4.34.0.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00303 · 21.9th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-10-20T20:17Z
References (5)
https://github.com/apostrophecms/apostrophe/commit/06e4b377f3c360f9e89c32dccd7e505ad5ddf498 · [email protected]https://github.com/apostrophecms/apostrophe/commit/40b989b1a9dd23d30029b8ce7668634265cfe5ea · [email protected]https://github.com/apostrophecms/apostrophe/releases/tag/[email protected] · [email protected]https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-vmgj-9cwm-cf3h · [email protected]https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-vmgj-9cwm-cf3h · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 22 OCT 03:29Z
    EPSS moved — → 0%
    epss
  • 20 OCT 15:33Z
    ApostropheCMS: Color field validation bypass allows stored XSS via HTML appended after rgb()/hsl() prefix
    cvelistv5
  • 20 OCT 15:33Z
    ApostropheCMS: Color field validation bypass allows stored XSS via HTML appended after rgb()/hsl() prefix
    cvelistv5