CVE-2023-30538CWE-79

Stored Cross-site Scripting via improper sanitization of svg files in Discourse

Medium · published April 18, 2023

CVSS v3.1
5.4
EPSS
0%
Percentile
29.0
In the wild
Unconfirmed
What it is

Discourse is an open source platform for community discussion. Due to the improper sanitization of SVG files, an attacker can execute arbitrary JavaScript on the users’ browsers by uploading a crafted SVG file. This issue is patched in the latest stable and tests-passed versions of Discourse. Users are advised to upgrade. For users unable to upgrade there are two possible workarounds: enable CDN handing of uploads (and ensure the CDN sanitizes SVG files) or disable SVG file uploads by ensuring that the `authorized extensions` site setting does not include `svg` (or reset that setting to the default, by default Discourse doesn't enable SVG uploads by users).

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00364 · 29.0th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2023-04-18T21:25Z
EPSS history
Timeline
  • 18 APR 21:25Z
    Stored Cross-site Scripting via improper sanitization of svg files in Discourse
    cvelistv5