PT-2026-2121 · Miniflux+1 · Miniflux+1

Eclipse07077-Ljw · Published 2026-01-07 · Updated 2026-03-07 · CVE-2026-21885

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Name of the Vulnerable Software and Affected Versions Miniflux versions prior to 2.2.16

Description Miniflux is an open source feed reader. Prior to version 2.2.16, the media proxy endpoint, GET /proxy/{encodedDigest}/{encodedURL}, can be exploited to perform Server-Side Request Forgery (SSRF). An authenticated user can manipulate Miniflux to create a signed proxy URL for media URLs specified by the attacker within feed entry content. These URLs can include internal addresses, such as localhost, private RFC1918 ranges, or link-local metadata endpoints. Accessing the generated /proxy/... URL causes Miniflux to retrieve and return the response from the internal address.

Recommendations Upgrade to Miniflux version 2.2.16 or later.

Exploit

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

CVE-2026-21885

GHSA-XWH2-742G-W3WP

GO-2026-4287

SUSE-SU-2026:0142-1

Affected Products

Debian

Miniflux

References · 49

• 🔥 https://github.com/miniflux/v2/security/advisories/GHSA-xwh2-742g-w3wp · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21885.json · Exploit
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-21885 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-xwh2-742g-w3wp · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-21885 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-21885 · Security Note
• https://osv.dev/vulnerability/CVE-2026-21885 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-21885 · Vendor Advisory
• https://osv.dev/vulnerability/GO-2026-4287 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-21885 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2026:0142-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-21885 · Vendor Advisory
• https://github.com/miniflux/v2 · Note
• https://suse.com/security/cve/CVE-2025-15107 · Note
• https://suse.com/security/cve/CVE-2017-18901 · Note