Vulnerability · Published Oct 11, 2026 · Assigned by VulnCheck

CVE-2026-108735Miniflux 2.3.0 through 2.3.3 SSRF via Per-Feed Proxy URL

Medium 4.3

In plain English

A medium-severity server-side request forgery in miniflux from miniflux. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.3%top 80.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Miniflux 2.3.0 through 2.3.3 contains a server-side request forgery vulnerability that allows authenticated users to reach internal addresses by setting a feed's proxy_url. Attackers can point proxy_url at loopback or internal hosts, bypassing FETCHER_ALLOW_PRIVATE_NETWORKS checks to probe internal ports and send proxy-style requests to internal services.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	miniflux	no fix listed	DEBIAN-CVE-2026-108735
Debian:14	miniflux	2.3.4-1	DEBIAN-CVE-2026-108735
Ubuntu:26.10	miniflux	no fix listed	UBUNTU-CVE-2026-108735

Affected products (as reported)

Vendor	Product	Versions
miniflux	miniflux	2.3.0 – through 2.3.3

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

https://hackmd.io/@haind03/miniflux-feed-proxy-url-private-network-bypass third-party-advisory
https://github.com/miniflux/v2/blob/c4d54f87a81b30aa173fddf05d7ff83ae7da5796/internal/reader/fetcher/request_builder.go#L155-L220 technical-description
https://github.com/miniflux/v2/blob/c4d54f87a81b30aa173fddf05d7ff83ae7da5796/internal/urllib/url.go#L64-L72 technical-description
https://github.com/miniflux/v2 product
VulnCheck Advisory: Miniflux 2.3.0 through 2.3.3 SSRF via Per-Feed Proxy URL third-party-advisory