VULNERABILITY INTELLIGENCE
CVE-2026-76239
CVSS score5.3 MEDIUM
EPSS probability0.32%
CISA KEVNot currently listed
Published2026-08-19
Last modified2026-10-24
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Description
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.
Weakness classification
- CWE-918: Server-Side Request Forgery (SSRF)