Vulnerability · Published Apr 3, 2025 · Assigned by GitHub_M

CVE-2025-31483Stored XSS in Miniflux Media Proxy due to improper Content-Security-Policy configuration

Medium 4.8

In plain English

A medium-severity cross-site scripting in v2 from miniflux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)4.8Medium

Exploit odds (30 days)0.4%top 63.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	miniflux	no fix listed	DEBIAN-CVE-2025-31483
Debian:14	miniflux	2.2.12-1	DEBIAN-CVE-2025-31483
Go	miniflux.app	no fix listed	GO-2025-3591
Go	miniflux.app/v2	2.2.7	GO-2025-3591
Go	miniflux.app/v2	2.2.7	GHSA-cq88-842x-2jhp
Ubuntu:25.10	miniflux	no fix listed	UBUNTU-CVE-2025-31483
Ubuntu:26.10	miniflux	no fix listed	UBUNTU-CVE-2025-31483

Affected products (as reported)

Vendor	Product	Versions
miniflux	v2	< 2.2.7

Weakness: CWE-79 · 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

References

https://github.com/miniflux/v2/security/advisories/GHSA-cq88-842x-2jhp x_refsource_CONFIRM
https://github.com/miniflux/v2/commit/cb695e653a08af4cabcb277c271ce74bd0c746e6 x_refsource_MISC