4.8

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

Deferred
AliasesUBUNTU-CVE-2025-31483GHSA-cq88-842x-2jhpGO-2025-3591
Published 03-04-2025Last modified 03-04-2025

Vulnerability summary

CVE-2025-31483 is a medium (CVSS 4.8) Cross-site Scripting vulnerability in miniflux v2. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 34.9% of scored vulnerabilities.

Overall risk
19/100
0100
Low · default modelHow is this calculated?
CVSS score
4.8/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.42%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2025:14982-1

Timeline

  1. 03-04-2025
    PublishedVulnerability first disclosed.
  2. 03-04-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.42%

Chance of exploitation in the next 30 days

Percentile

35%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.41% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • minifluxAll versions (No fix recorded) | < 2.2.12-1
Go1 product
  • miniflux.appAll versions (No fix recorded)
Miniflux1 product
Miniflux.app1 product
  • v2< 2.2.7
Ubuntu1 product
  • minifluxAll versions (No fix recorded)

5 vendors · 5 products

References

7 links