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CVE-2026-61520 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:6 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L

CNA: [email protected]CVSS-B:7.7 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/SimpleMachines/SMF/commit/4bf35cf9e45573a5f55a6f52995086c1da89c096	[email protected]	Source CodeVendor
https://github.com/SimpleMachines/SMF/commit/b4d23dfd74a511587c605f9d294cefc3a75b4b26	[email protected]	Source CodeVendor
https://www.vulncheck.com/advisories/simple-machines-forum-ssrf-via-image-proxy	[email protected]	AdvisoryRemedy

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-918	Server-Side Request Forgery (SSRF)	[email protected]

Affected Products

Product	Versions
Simple Machines Forum	>= 2.1.0, < 4bf35cf9e45573a5f55a6f52995086c1da89c096 >= 3.0.0, < b4d23dfd74a511587c605f9d294cefc3a75b4b26
CPE cpe:2.3:a:simplemachines:simple_machines_forum:::::::: Remediation Upgrade: 4bf35cf9e45573a5f55a6f52995086c1da89c096moderate effort Upgrade: b4d23dfd74a511587c605f9d294cefc3a75b4b26moderate effort

Change History

3 change records found show changes

Date	Action	Recorded By
Jul 15, 2026	CVE Modified	CISA-ADP
Jul 14, 2026	CVE Modified	[email protected]
Jul 14, 2026	New CVE Received	[email protected]