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.

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)

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.

Affected products

Eidetic-labs Stigmem

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (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.