CVE-2026-53962CWE-79

Discourse: Insufficient SVG sanitization logic

Medium · published July 9, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
34.7
In the wild
Unconfirmed
What it is

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, insufficient SVG sanitization in upload and user avatar handling could lead to cross-site scripting when a user visited specific URLs that are not normally part of community browsing. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

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
0.00415 · 34.7th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-07-09T22:02Z
EPSS history
Timeline
  • 09 JUL 22:02Z
    Discourse: Insufficient SVG sanitization logic
    cvelistv5