CVE-2023-27592

MEDIUM EPSS 43.6%
Published Mar 17, 20233y ago · Modified Jun 17, 20262w ago
5.4 CVSS 3.1
Medium
Find Similar
Published Mar 17, 2023 3y ago
Last Modified Jun 17, 2026 2w ago

Description

Miniflux is a feed reader. 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.ServerError` is 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 a `srcset` attribute pointing to an invalid URL like `http: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. A patch is available in version 2.0.43. As a workaround sisable image proxy; default value is `http-only`.

CVSS Details

Base Score
5.4
Exploitability
2.3
Impact
2.7
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction Required
Scope Changed
Confidentiality Low
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
43.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 1

VendorProductVersionRange
miniflux_projectminiflux*≥2.0.25  –  <2.0.43

References 7

  • github.com https://github.com/miniflux/v2/blob/b2fd84e0d376a3af6329b9bb2e772ce38a25c31c/ui/proxy.go#L76
    Product
  • github.com https://github.com/miniflux/v2/blob/b2fd84e0d376a3af6329b9bb2e772ce38a25c31c/ui/proxy.go#L90
    Product
  • github.com https://github.com/miniflux/v2/pull/1746
    Issue TrackingPatch
  • github.com https://github.com/miniflux/v2/releases/tag/2.0.25
    Release Notes
  • github.com https://github.com/miniflux/v2/releases/tag/2.0.43
    Release Notes
  • github.com https://github.com/miniflux/v2/security/advisories/GHSA-mqqg-xjhj-wfgw
    PatchVendor Advisory
  • miniflux.app https://miniflux.app/docs/configuration.html#proxy-images
    Product

Remediation

  • github.com https://github.com/miniflux/v2/pull/1746
    Issue TrackingPatch
  • github.com https://github.com/miniflux/v2/security/advisories/GHSA-mqqg-xjhj-wfgw
    PatchVendor Advisory