High severity7.5NVD Advisory· Published Jun 24, 2026· Updated Jun 25, 2026

CVE-2026-53950

Description

@tryghost/activitypub is Ghost’s social/federation client app. Prior to 3.1.0, the ActivityPub client in Ghost was vulnerable to JavaScript injection on posts shared by a maliciously customised ActivityPub server. This vulnerability is fixed in 3.1.0.

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
@tryghost/activitypubnpm	< 3.1.0	3.1.0

Affected products

osv-coords
pkg:bitnami/ghost
Range: < 3.1.0
Tryghost/Ghostllm-create
Range: <3.1.0
Tryghost/@tryghost/activitypubllm-create
Range: <3.1.0

Patches

Vulnerability mechanics

References

github.com/advisories/GHSA-xpp7-93x6-v29mghsaADVISORY
nvd.nist.gov/vuln/detail/CVE-2026-53950ghsaADVISORY
github.com/TryGhost/Ghost/security/advisories/GHSA-xpp7-93x6-v29mnvdWEB

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cvss	0.488
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000