CVE-2025-31483
Stored XSS in Miniflux Media Proxy due to improper Content-Security-Policy configuration
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Active
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Stored XSS in Miniflux Media Proxy due to improper Content-Security-Policy configuration
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.
- Record
CVE-2025-31483- CVSS 4.0
- 4.8 Medium
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 - Weakness
- CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2025-9736
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.
- Record
EUVD-2025-9736- CVSS 4.0
- 4.8 Medium
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-cq88-842x-2jhp
Miniflux Media Proxy vulnerable to Stored Cross-site Scripting due to improper Content-Security-Policy configuration
Summary
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.
Impact
A malicious feed added to Miniflux can execute arbitrary JavaScript in the user's browser when opening external resources, such as proxified images, in a new tab or window.
Mitigation
The CSP for the media proxy has been changed from default-src 'self' to default-src 'none'; form-action 'none'; sandbox;.
Upgrade to Miniflux >= 2.2.7
Credit
RyotaK (GMO Flatt Security Inc.) with takumi-san.ai
- Record
GHSA-cq88-842x-2jhp- CVSS 4.0
- 4.8 Medium
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 - Weakness
- CWE-79
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2025-31483- CVSS 4.0
- 4.8 Medium
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Weakness
- CWE-79
- Updated
- 2026-11-02
OSV
Stored XSS in Miniflux Media Proxy due to improper Content-Security-Policy configuration
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.
- Record
CVE-2025-31483- CVSS 4.0
- 4.8 Medium
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 - Weakness
- CWE-79
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2025-31483
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.
- Record
DEBIAN-CVE-2025-31483- CVSS 4.0
- 4.8 Medium
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Updated
- 2026-11-02
Show 4 moreShow less
OSVGHSA-cq88-842x-2jhp
Miniflux Media Proxy vulnerable to Stored Cross-site Scripting due to improper Content-Security-Policy configuration
Summary
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.
Impact
A malicious feed added to Miniflux can execute arbitrary JavaScript in the user's browser when opening external resources, such as proxified images, in a new tab or window.
Mitigation
The CSP for the media proxy has been changed from default-src 'self' to default-src 'none'; form-action 'none'; sandbox;.
Upgrade to Miniflux >= 2.2.7
Credit
RyotaK (GMO Flatt Security Inc.) with takumi-san.ai
- Record
GHSA-cq88-842x-2jhp- CVSS 4.0
- 4.8 Medium
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 - Weakness
- CWE-79
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2025-31483
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.
- Record
UBUNTU-CVE-2025-31483- CVSS 4.0
- 4.8 Medium
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 - Updated
- 2026-11-02
OSVGO-2025-3591 No score
Miniflux Media Proxy vulnerable to Stored Cross-site Scripting due to improper Content-Security-Policy configuration in miniflux.app
Miniflux Media Proxy vulnerable to Stored Cross-site Scripting due to improper Content-Security-Policy configuration in miniflux.app
- Record
GO-2025-3591- Updated
- 2026-11-02
OSVopenSUSE-SU-2025:14982-1 No score
govulncheck-vulndb-0.0.20250409T170536-1.1 on GA media
These are all security issues fixed in the govulncheck-vulndb-0.0.20250409T170536-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2025:14982-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
miniflux.app/v2Go |
before 2.2.7 | 2.2.7 |
minifluxDebian:13 |
All versions, plus listed versions 2.2.10-12.2.11-12.2.12-12.2.13-12.2.16-1 Show 8 moreShow less2.2.16-22.2.19-12.2.19-22.2.6-12.2.6-22.3.0-12.3.2-12.3.3-1 |
None known |
minifluxDebian:14 |
before 2.2.12-1, plus listed versions 2.2.10-12.2.11-12.2.6-12.2.6-2 |
2.2.12-1 |
miniflux.appGo |
All versions | None known |
minifluxUbuntu:Pro:24.04:LTS |
All versions, plus listed versions 2.0.51-12.0.51-22.0.51-2ubuntu0.12.0.51-2ubuntu0.22.0.51-2ubuntu0.2+esm12.0.51-2ubuntu0.32.0.51-2ubuntu0.3+esm12.0.51-2ubuntu0.3+esm2 |
None known |
minifluxUbuntu:25.10 |
All versions, plus listed versions 2.2.6-12.2.6-2 |
None known |
minifluxUbuntu:26.10 |
All versions, plus listed versions 2.2.16-22.3.0-12.3.2-1 |
None known |
minifluxUbuntu:Pro:26.04:LTS |
All versions, plus listed versions 2.2.6-22.2.13-12.2.16-22.2.16-2ubuntu0.26.04.1~esm1 |
None known |
govulncheck-vulndbopenSUSE:Tumbleweed From an advisory covering 4 CVEs |
before 0.0.20250409T170536-1.1 | 0.0.20250409T170536-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-31483 is a medium vulnerability (CVSS 4.8) in Miniflux V2, published April 3, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.43%, the 37th percentile. Fixed in miniflux.app/v2 2.2.7.
References
github.com/miniflux/v2/security/advisories/GHSA-cq88-842x-2jhp
nvd.nist.gov/vuln/detail/CVE-2025-31483
security-tracker.debian.org/tracker/CVE-2025-31483