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Advisory record · GHSA-5p3m-vhh6-9236

stigmem-node has blind SSRF via unvalidated webhook subscription delivery_address

CVSS 5.3 MediumEPSS 0.0032 · 25th percentile

Published by the GitHub Advisory Database at 20 Aug 2026, 18:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
stigmem-nodePyPI<0.9.0a110.9.0a11
Identifiers
GHSA-5p3m-vhh6-9236 · CVE-2026-76239
Weakness (CWE)
CWE-20 · CWE-918
Tags
Published
20 Aug 2026
Updated
20 Aug 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Versions of stigmem-node before 0.9.0a11 are affected by a blind server-side request forgery (SSRF) flaw in webhook subscriptions. An authenticated user can set a webhook delivery address that is stored without validation, so when a matching event fires the server sends an HTTP POST to internal destinations such as loopback addresses. Upgrade to 0.9.0a11 or later, which fixes the issue. The source gives few details on the exact fix or any workaround.

Written 5 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0032, the 25th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:39 UTC First seen by agentprime
  2. 31 Oct 2026, 14:39 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.