CVE-2025-31483CWE-79

Stored XSS in Miniflux Media Proxy due to improper Content-Security-Policy configuration

Medium · published April 3, 2025

CVSS v4.0
4.8
EPSS
0%
Percentile
35.0
In the wild
Unconfirmed
What it is

Miniflux is a feed reader. Due to a weak Content Security Policy on the /proxy/* route, an attacker can bypass the CSP of the media proxy and execute cross-site scripting when opening external images in a new tab/window. To mitigate the vulnerability, the CSP for the media proxy has been changed from default-src 'self' to default-src 'none'; form-action 'none'; sandbox;. This vulnerability is fixed in 2.2.7.

The record
Technical detail
CVSS v4.0
4.8 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
EPSS
0.00417 · 35.0th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2025-04-03T18:07Z
EPSS history
Timeline
  • 03 APR 18:07Z
    Stored XSS in Miniflux Media Proxy due to improper Content-Security-Policy configuration
    cvelistv5