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PatchSiren cyber security CVE debrief

CVE-2026-103289 TryGhost CVE debrief

CVE-2026-103289: Ghost Authorization Bypass Vulnerability. An input validation issue in the comments feature of Ghost versions between 5.9.0 and 6.44.1 allows members to access comments they are not authorized to access. Defenders should assess exposure and prioritize updates to version 6.44.1 or later. This vulnerability could lead to potential unauthorized access to comments, impacting member access controls. The issue was responsibly disclosed by Himanshu Anand. For self-hosters, updating to the latest version is recommended, with specific guidance for Docker and Ghost-CLI installs available.

Vendor
TryGhost
Product
ghost
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-07
Original CVE updated
2026-10-07
Advisory published
2026-10-07
Advisory updated
2026-10-07

Who should care

Defenders responsible for Ghost installations, particularly those using versions between 5.9.0 and 6.44.1, should assess exposure and prioritize updates. This includes reviewing and adjusting input validation for comment access controls and monitoring for unauthorized access attempts. Security teams and vulnerability management teams should also review the impact on member access controls and plan for updates or mitigations.

Why it matters

Defenders should prioritize updating Ghost installations to version 6.44.1 or later to address the authorization bypass vulnerability, which could allow unauthorized access to comments.

  • Potential unauthorized access to comments
  • Need to verify and update Ghost installations
  • Possible impact on member access controls

Technical summary

The vulnerability is present in Ghost from version 5.9.0 up to version 6.44.1. An input validation issue allowed members to access comments they were not authorized to access. This issue was responsibly disclosed by Himanshu Anand. The CVE record was published on 2026-10-07T16:18:00.000Z and has not been modified since then. Evidence is based on the official CVE Program record and NIST NVD detail page. Defenders should prioritize updating Ghost installations to version 6.44.1 or later to address the authorization bypass vulnerability.

Defensive priority

Defenders should prioritize updating Ghost installations to version 6.44.1 or later to address the authorization bypass vulnerability.

Recommended defensive actions

  • Update Ghost installations to version 6.44.1 or later
  • Review and adjust input validation for comment access controls
  • Monitor for unauthorized access attempts
  • Verify Ghost installations are up-to-date, especially those using versions between 5.9.0 and 6.44.1
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • technicalSummary

Evidence notes

The vulnerability is present in Ghost from version 5.9.0 up to version 6.44.1. An input validation issue allowed members to access comments they were not authorized to access. This issue was responsibly disclosed by Himanshu Anand. The CVE record was published on 2026-10-07T16:18:00.000Z and has not been modified since then. Evidence is based on the official CVE Program record and NIST NVD detail page.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-103289 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-103289

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-103289 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-103289

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Ghost: Authorization Bypass in Comments Feature

    Unverified legacy reference

    URL: https://storage.googleapis.com/osv-vulnerabilities/npm/GHSA-6q6j-f24j-p477.json

    osv_dev

  • Source reference

    Unverified legacy reference

    URL: https://github.com/TryGhost/Ghost/security/advisories/GHSA-6q6j-f24j-p477

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-105681

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://github.com/TryGhost/Ghost/pull/28297

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://github.com/TryGhost/Ghost/commit/405c2623ff9060295d4a87d3a0eb4ef766c8d2d3

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://github.com/TryGhost/Ghost

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://github.com/TryGhost/Ghost/releases/tag/v6.44.1

    Supplemental source

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.