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CVE-2026-63115 ActivityPub Undo handler can unfollow or remove reposts on behalf of other accounts

🗓️ 30 Oct 2026 21:33:55Reported by GitHub_MType 
cvelist
 cvelist
🔗 www.cve.org👁 12 Views

Remote federated server can remove follows or reposts on behalf of other accounts in ActivityPub.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
cve
CVE
CVE-2026-63115
30 Oct 202621:33
–cve
euvd
EUVD
EUVD-2026-114518
30 Oct 202621:33
–euvd
nvd
NVD
CVE-2026-63115
30 Oct 202622:16
–nvd
ptsecurity
Positive Technologies
PT-2026-134226
30 Oct 202600:00
–ptsecurity
rapid7
Rapid7 Vulnerability Database (full)
CVE-2026-63115: TryGhost ActivityPub: ActivityPub is a multi-tenant ActivityPub server for Ghost, built with Fedify
30 Oct 202600:00
–rapid7
[
  {
    "vendor": "TryGhost",
    "product": "ActivityPub",
    "versions": [
      {
        "version": ">= 1.0.0, < 1.2.6",
        "status": "affected"
      }
    ]
  }
]

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