CVE-2026-76239
MEDIUM
NVD
CVSS Score
6.3
Severity
MEDIUM
Published
Aug 19, 2026
Vendor
unknown
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.