Stored cross-site scripting in Ghost bookmark card images
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution, Cross-site scripting
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-434 and CWE-79.
Summary
Ghost from 5.94.0 before 6.64.0 is affected. When creating a bookmark card, Ghost stored non-image files fetched from external websites as bookmark icons or thumbnails, an unrestricted file upload flaw (CWE-434). Any staff user, including Contributors, can host arbitrary HTML on the site's domain, possibly compromising other staff users' admin sessions.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
Description from the CNA
Ghost is a Node.js content management system. From 5.94.0 until 6.64.0, when creating a bookmark card, Ghost could store non-image files fetched from an external website as bookmark icons or thumbnails. This allowed any staff user, including Contributors, to host arbitrary HTML on the site's domain, possibly resulting in compromise of other staff users' admin sessions. This issue is fixed in version 6.64.0.
Why it matters now
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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| TryGhost | Ghost | 5.94.0 to before 6.64.0 | 6.64.0 | Patch available | CNA |
| — | ghost (npm) | 5.94.0 to before 6.64.0 | 6.64.0 | Patch available | GHSA-347q-26qq-h2p6 |
- Ghost VendorTryGhost Affected 5.94.0 to before 6.64.0 Fixed in 6.64.0 Patch available CNA
- ghost (npm) Vendor— Affected 5.94.0 to before 6.64.0 Fixed in 6.64.0 Patch available GHSA-347q-26qq-h2p6
Remediation
Upgrade Ghost to version 6.64.0, which fixes this issue.
Written with Claude Haiku 5.5 from the sources below · 2026-10-29
- Fix · CNA Ghost (TryGhost) Fixed in 6.64.0
- Fix · GHSA-347q-26qq-h2p6 ghost (npm) Fixed in 6.64.0 Advisory →
Timeline
- 2026-10-05 Threatist record created from CVE-2026-105651
- 2026-10-07 Priority changed: MEDIUM → LOW
- 2026-10-07 Alias added: GHSA-347q-26qq-h2p6
- 2026-10-07 Fix available: npm/[email protected] · GHSA-347q-26qq-h2p6
- 2026-10-07 CVSS score added · GHSA-347q-26qq-h2p6
- 2026-10-07 Weakness changed · GHSA-347q-26qq-h2p6
- 2026-10-07 7 new references · GHSA-347q-26qq-h2p6
- 2026-10-07 CISA SSVC decision points changed
References
Other 6
- https://github.com/TryGhost/Ghost/security/advisories/GHSA-347q-26qq-h2p6
- https://github.com/TryGhost/Ghost/issues/30761
- https://github.com/TryGhost/Ghost/commit/b41fe3f2c399cef058e6b487782a0b2263e86c03
- https://github.com/TryGhost/Ghost/releases/tag/v6.64.0
- https://github.com/TryGhost/Ghost/pull/30761
- https://github.com/TryGhost/Ghost
More TryGhost vulnerabilities
- 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
Sources
- CVE-2026-105651 · CVE Program
- CVE-2026-105651 · NVD
- FIRST EPSS
- GHSA-347q-26qq-h2p6 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences