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TI-2026-38918 Aliases CVE-2026-53950GHSA-xpp7-93x6-v29m

@tryghost/activitypub: XSS in Ghost's ActivityPub client

Priority LOW 35CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

@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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00352 29th percentileScored 2026-11-07
Fix Fixed Ghost (TryGhost): 3.1.0@tryghost/activitypub (npm): 3.1.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
TryGhostGhostbefore 3.1.03.1.0Patch availableCNA
—@tryghost/activitypub (npm)before 3.1.03.1.0Patch availableGHSA-xpp7-93x6-v29m
  • Ghost VendorTryGhost Affected before 3.1.0 Fixed in 3.1.0 Patch available CNA
  • @tryghost/activitypub (npm) Vendor— Affected before 3.1.0 Fixed in 3.1.0 Patch available GHSA-xpp7-93x6-v29m

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:ghost:ghost:*:*:*:*:*:*:*:*——TryGhost
  • cpe:2.3:a:ghost:ghost:*:*:*:*:*:*:*:* Versions — — ·TryGhost

Remediation

  • Fix · CNA Ghost (TryGhost) Fixed in 3.1.0
  • Fix · GHSA-xpp7-93x6-v29m @tryghost/activitypub (npm) Fixed in 3.1.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-53950
  2. 2026-10-03 Alias added: GHSA-xpp7-93x6-v29m

References

Advisory 1

Other 2

  • TI-2026-21459 Ghost has a SQL Injection in its Content API CVSS 3.1CRITICAL 9.4
  • TI-2022-10277 An arbitrary file upload vulnerability in the file upload module of Ghost v4.39.0 allows… CVSS 3.1CRITICAL 9.8
  • TI-2024-22785 Ghost through 5.85.1 allows remote attackers to bypass an authentication rate-limit… CVSS 3.1CRITICAL 9.1
  • TI-2023-14843 Ghost vulnerable to disclosure of private API fields CVSS 3.1HIGH 7.5
  • TI-2025-09049 Ghost 6.0.6 - SSRF via oEmbed Bookmark CVSS 4.0MEDIUM 6.1
  • TI-2023-20918 Arbitrary file read via symlinks in Ghost CVSS 3.1MEDIUM 6.5
See all 109 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences