GHSA-mqqg-xjhj-wfgw
Suggest an improvement- Source
- https://github.com/advisories/GHSA-mqqg-xjhj-wfgw
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/04/GHSA-mqqg-xjhj-wfgw/GHSA-mqqg-xjhj-wfgw.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-mqqg-xjhj-wfgw
- Aliases
- Related
- Published
- 2025-04-02T17:25:15Z
- Modified
- 2025-04-02T18:12:09.701535Z
- Severity
-
- 4.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N CVSS Calculator
- Summary
- Stored XSS in Miniflux when opening a broken image due to unescaped ServerError in proxy handler
- Details
-
Impact
Since v2.0.25, Miniflux will automatically proxy images served over HTTP to prevent mixed content errors.
When an outbound request made by the Go HTTP client fails, the
html.ServerErroris returned unescaped without the expected Content Security Policy header added to valid responses.By creating an RSS feed item with the inline description containing an
<img>tag with asrcsetattribute pointing to an invalid URL likehttp:a<script>alert(1)</script>, we can coerce the proxy handler into an error condition where the invalid URL is returned unescaped and in full.This results in JavaScript execution on the Miniflux instance as soon as the user is convinced (e.g. by a message in the alt text) to open the broken image.
An attacker can execute arbitrary JavaScript in the context of a victim Miniflux user when they open a broken image in a crafted RSS feed. This can be used to perform actions on the Miniflux instance as that user and gain administrative access to the Miniflux instance if it is reachable and the victim is an administrator.
Patches
PR #1746 fixes the problem. Available in Miniflux >= 2.0.43.
Workarounds
- Disable image proxy (default value is
http-only).
References
- https://miniflux.app/docs/configuration.html#proxy-images
- Disable image proxy (default value is
- Database specific
{ "nvd_published_at": "2023-03-17T20:15:00Z", "cwe_ids": [ "CWE-79" ], "severity": "MODERATE", "github_reviewed": true, "github_reviewed_at": "2025-04-02T17:25:15Z" }- References
-
- https://github.com/miniflux/v2/security/advisories/GHSA-mqqg-xjhj-wfgw
- https://nvd.nist.gov/vuln/detail/CVE-2023-27592
- https://github.com/miniflux/v2/pull/1746
- https://github.com/miniflux/v2
- https://github.com/miniflux/v2/blob/b2fd84e0d376a3af6329b9bb2e772ce38a25c31c/ui/proxy.go#L76
- https://github.com/miniflux/v2/blob/b2fd84e0d376a3af6329b9bb2e772ce38a25c31c/ui/proxy.go#L90
- https://github.com/miniflux/v2/releases/tag/2.0.25
- https://github.com/miniflux/v2/releases/tag/2.0.43
- https://miniflux.app/docs/configuration.html#proxy-images
Affected packages
Go / miniflux.app/v2
Package
- Name
- miniflux.app/v2
- View open source insights on deps.dev
- Purl
- pkg:golang/miniflux.app/v2