CVE-2026-61520
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N
Summary
Simple Machines Forum 2.1 prior to commit 4bf35cf and 3.0 prior to commit b4d23df contains a server-side request forgery vulnerability in the image proxy that allows authenticated attackers to trigger internal HTTP requests by embedding attacker-controlled URLs in BBCode image tags, which the proxy fetches without validating resolved destination IPs against private address ranges, loopback, or link-local addresses. Attackers can leverage SMF's automatic HMAC signature generation for any embedded image URL to obtain valid signed proxy requests targeting internal services such as cloud instance metadata endpoints, internal web applications, and container network services.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| SimpleMachines | SMF | 2.1.0 < 2.1.7 | affected |
| SimpleMachines | SMF | 4bf35cf9e45573a5f55a6f52995086c1da89c096 | unaffected |
| SimpleMachines | SMF | 3.0.0 | unaffected |
| SimpleMachines | SMF | b4d23dfd74a511587c605f9d294cefc3a75b4b26 | affected |
Weaknesses
- CWE-918: Server-Side Request Forgery (SSRF)
References
- https://github.com/SimpleMachines/SMF/commit/4bf35cf9e45573a5f55a6f52995086c1da89c096
- https://github.com/SimpleMachines/SMF/commit/b4d23dfd74a511587c605f9d294cefc3a75b4b26
- https://www.vulncheck.com/advisories/simple-machines-forum-ssrf-via-image-proxy
Feedback
Was this page helpful?
Glad to hear it! Please tell us how we can improve.
Sorry to hear that. Please tell us how we can improve.