What’s Vulnerable › Vulnerabilities

CVE-2026-76239: Stigmem before 0.9.0a11 SSRF via unvalidated webhook delivery_address

• Severity: medium (CVSS 6.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-19 · updated 2026-10-24
• Weakness: CWE-918

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.

Affected products

• eidetic-labs stigmem-node: before 0.9.0a11 — fixed in 0.9.0a11

How to fix

Upgrade to a fixed version: eidetic-labs stigmem-node 0.9.0a11. Check the vendor advisory for mitigations.

References

• https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-5p3m-vhh6-9236
• https://www.vulncheck.com/advisories/stigmem-before-0a11-ssrf-via-unvalidated-webhook-delivery-address
• https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-5p3m-vhh6-9236

Get alerted when CVE-2026-76239 or the next vulnerability affects your stack