CVE-2026-76239CWE-918ssrf

CVE-2026-76239

Medium · published August 19, 2026

CVSS v3.1
6.3
EPSS
0%
Percentile
24.2
In the wild
Unconfirmed
What it is

Stigmem before 0.9.0a11 fails to validate the delivery_address parameter when creating webhook subscriptions, allowing authenticated users to specify internal loopback and private network destinations. Attackers can trigger matching fact-change events to cause the Stigmem server to issue server-side HTTP POST requests to internal services, enabling blind SSRF attacks against localhost and private network endpoints.

The record
Technical detail
CVSS v3.1
6.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CVSS v4.0
5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
EPSS
0.00324 · 24.2th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-08-19T18:17Z
References (3)
https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-5p3m-vhh6-9236 · [email protected]https://www.vulncheck.com/advisories/stigmem-before-0a11-ssrf-via-unvalidated-webhook-delivery-address · [email protected]https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-5p3m-vhh6-9236 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 19 AUG 14:02Z
    Stigmem before 0.9.0a11 SSRF via unvalidated webhook delivery_address
    cvelistv5