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Advisory record · GHSA-vw42-752g-5mrp

YesWiki has Unauthenticated Server-Side Request Forgery via ActivityPub `Signature.keyId`

CVSS 8.3 HighEPSS 0.0049 · 42nd percentile

Published by the GitHub Advisory Database at 9 Jul 2026, 20:58 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
yeswiki/yeswikiPackagist>=4.6.2, <4.6.64.6.6
Identifiers
GHSA-vw42-752g-5mrp · CVE-2026-52769 · PKSA-hr6j-d2dr-68v5
Weakness (CWE)
CWE-918
Tags
Published
9 Jul 2026
Updated
9 Jul 2026

Machine-written summary

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

YesWiki versions 4.6.2 up to but not including 4.6.6 are affected. An unauthenticated remote attacker can send a request to the public ActivityPub inbox route with a crafted HTTP Signature header whose keyId is a URL, causing the server to make outbound GET requests to arbitrary hosts before signature verification. This requires ActivityPub to be enabled on at least one Bazar form. Upgrade to YesWiki 4.6.6.

Written 3 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
8.3 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0049, the 42nd percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:25 UTC First seen by agentprime
  2. 31 Oct 2026, 14:25 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.