EUVD-2026-53391
GHSA-pr22-p9rp-2cqv
Severity by source
AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L
PR:L because any staff role (not admin) can exploit; C:H/I:H because session hijack grants full admin account control; A:N as XSS has no availability impact.
Primary rating from Vendor (https://github.com/TryGhost/Ghost).
CVSS VectorVendor: https://github.com/TryGhost/Ghost
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L
Lifecycle Timeline
2DescriptionCVE.org
Impact
An input validation issue allowed any staff user to create a post with content that could be used to hijack another staff user's Ghost Admin session resulting in privilege escalation.
Vulnerable versions
This vulnerability is present in Ghost from v4.9.0 up to v6.54.0.
Patches
v6.54.1 contains a fix for this issue.
How to update
For self-hosters using Docker, find Docker's official Ghost image here. Updating a Docker-based Ghost instance is documented here.
If your Ghost is a Ghost-CLI install see our documentation on updating it to the latest version here.
References
Ghost thanks Versa for disclosing this vulnerability responsibly.
For more information
If you have any questions or comments about this advisory, email Ghost at [security@ghost.org](mailto:security@ghost.org).
AnalysisAI
Stored cross-site scripting in Ghost CMS feature image captions enables any authenticated staff user to inject unsanitized HTML into the post revision history modal, hijacking the Ghost Admin session of another staff or administrator user who views that revision. Affects Ghost npm package versions v4.9.0 through v6.54.0. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold at least a staff-level authenticated account in the target Ghost installation (Author, Editor, or equivalent role with post-creation capability). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 4.3 (Medium) with vector AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L is conservative and potentially misleading on two counts. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Ghost to v6.54.1 immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
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External POC / Exploit Code
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