CVE-2026-53950: XSS in Ghost's ActivityPub client

August 4, 2026

The ActivityPub client in Ghost was vulnerable to JavaScript injection on posts shared by a maliciously customised ActivityPub server.

References

github.com/TryGhost/Ghost/security/advisories/GHSA-xpp7-93x6-v29m
github.com/advisories/GHSA-xpp7-93x6-v29m
nvd.nist.gov/vuln/detail/CVE-2026-53950

Code Behaviors & Features

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