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Advisory record · GHSA-9369-69wj-7m2f

YesWiki Vulnerable to Authenticated PHP Object Injection in BazarImportAction via unserialize

CVSS 9.4 CriticalCriticalEPSS 0.0028 · 20th percentile

Critical, because:

  • CVSS score 9.4: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 9 Jul 2026, 21:02 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
yeswiki/yeswikiPackagist<4.6.64.6.6
Identifiers
GHSA-9369-69wj-7m2f · CVE-2026-52777 · PKSA-24cb-kfcr-z2kg
Weakness (CWE)
CWE-352 · CWE-502
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.

GHSA-9369-69wj-7m2f: YesWiki versions before 4.6.6 are affected by PHP object injection in the BazarImportAction import path, which calls unserialize on attacker-supplied data without restricting classes. An attacker needs a wiki admin's session, reached through a crafted page that the admin visits, and could potentially reach remote code execution if a suitable gadget chain is present; the source does not provide a working end-to-end chain. Upgrade to YesWiki 4.6.6 or later, which is the listed fixed version.

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
9.4 Critical 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0028, the 20th percentile, on 9 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.