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CVE-2026-61520

HIGH
7.7
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-61520
State
PUBLISHED
Assigner
VulnCheck
Reserved
2026-07-10 15:43 UTC
Published
2026-07-14 20:17 UTC
Last updated
2026-07-15 13:26 UTC
Primary CWE
CWE-918
Server-Side Request Forgery (SSRF)
Vendor / Product
SimpleMachines / SMF
Sources
cve.org  ·  NVD

Severity & Metrics

7.7 HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
SimpleMachines SMF — 2.1.0 < 2.1.7, 4bf35cf9e45573a5f55a6f52995086c1da89c096, 3.0.0, b4d23dfd74a511587c605f9d294cefc3a75b4b26
Weakness (CWE)
CWESourceDescription
CWE-918 cna Server-Side Request Forgery (SSRF)
CVSS scores (2)
ScoreSeverityVersionSourceVector
7.7 HIGH 3.1 cna CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
6.3 MEDIUM 4.0 cna 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
References (3)
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