SSRF in Eidetic-Labs Stigmem
CVE-2026-76239
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (23.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/eidetic-labs/stigmem/security/advisories/GHSA-5p3m-vhh6-9236 (vendor-advisory)
- www.vulncheck.com/advisories/stigmem-before-0a11-ssrf-via-unvalidated-webhook-d… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-76239?
- CVE-2026-76239 is a medium-severity vulnerability in Eidetic-Labs Stigmem, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.3/10. Published 2026-08-19.
- How severe is CVE-2026-76239?
- Medium severity. CVSS v3 base score is 6.3 out of 10.