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Ghost: Authorization Bypass in Comment Like Feature

Moderate severity GitHub Reviewed Published Aug 11, 2026 in TryGhost/Ghost • Updated Oct 27, 2026

Package

npm ghost (npm)

Affected versions

>= 5.9.0, < 6.44.1

Patched versions

6.44.1

Description

Impact

An input validation issue allowed members to delete comment likes / dislikes that they were not authorized to delete.

Vulnerable versions

This vulnerability is present in Ghost from v5.9.0 up to v6.44.1.

Patches

v6.44.1 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 Adel Assakaf and Arthur Gurunlian as well as Geoffrey Diederichs of Escape for disclosing this vulnerability responsibly.

For more information

If you have any questions or comments about this advisory, email us at security@ghost.org.

References

@acburdine acburdine published to TryGhost/Ghost Aug 11, 2026
Published to the GitHub Advisory Database Oct 27, 2026
Reviewed Oct 27, 2026
Last updated Oct 27, 2026

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(10th percentile)

Weaknesses

Improper Neutralization of Special Elements in Data Query Logic

The product generates a query intended to access or manipulate data in a data store such as a database, but it does not neutralize or incorrectly neutralizes special elements that can modify the intended logic of the query. Learn more on MITRE.

CVE ID

CVE-2026-103288

GHSA ID

GHSA-qrh6-cwg3-343x

Source code

Credits

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