CVE-2026-103273: Ghost staff token authorization bypass in post editing

CVE-2026-103273 · Severity: medium · CVSS 4.3 · Published 2026-10-01

Ghost is a content management system used to publish and manage websites and blogs. Lower-privilege staff members can exploit authentication tokens to edit posts they are not authorized to modify, potentially allowing unauthorized content changes or malicious modifications to published material.

Technologies: TryGhost Ghost. Vendors: TryGhost.

Quick answers

Is CVE-2026-103273 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-103273 being exploited in the wild.
How severe is CVE-2026-103273?
Medium severity, with a CVSS score of 4.3, published 1 October 2026.
Which products and versions are affected?
TryGhost Ghost 4.3.0 to before 6.58.0.
Is there a fix for CVE-2026-103273?
Yes: fixed in v6.58.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-103273 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2026-103273?
Check whether you run TryGhost Ghost at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Fixed in: v6.58.0

Technical details

Ghost versions 4.3.0 through 6.57.x contain an incorrect authorization check (CWE-863) in post editing functionality. Staff users with low privileges can use staff tokens to bypass privilege-level restrictions and edit posts beyond their assigned role, requiring network access and valid staff credentials but no user interaction.

Affected products

  • TryGhost Ghost 4.3.0 to before 6.58.0

Timeline

  • 2026-08-20: disclosed: GitHub Security Advisory published
  • 2026-10-01: advisory: CVE-2026-103273 published

References

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