CVE-2026-70596 Ghost: Cross-Site Scripting in Feature Image Captions
An XSS vulnerability in Ghost CMS allows staff users to hijack other staff sessions via feature image captions, leading to privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-70596?
CVE-2026-70596 is a medium-severity cross-site scripting vulnerability in TryGhost Ghost, published on 5 Aug 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
Ghost is a Node.js content management system. From 4.9.0 until 6.54.1, an input validation issue allowed any staff user to create a post with content in feature_image_caption that could be used to hijack another staff user's Ghost Admin session, resulting in privilege escalation. This issue is fixed in 6.54.1.
Weakness: CWE-79
Which versions are affected by CVE-2026-70596?
3 open source packages ship an affected version, including ghost.
| Package | Affected | Fixed in |
|---|---|---|
ghost Bitnami | From 4.9.0 | 6.54.1 |
ghost npm | From 4.9.0 | 6.54.1 |
ghost npm | From 4.9.0 | 6.54.1 |
How do I fix CVE-2026-70596?
Upgrade ghost to 6.54.1 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-70596 being exploited?
There is no known exploitation of CVE-2026-70596 in the wild and no public exploit code.
Sources
Also known as BIT-ghost-2026-70596, GHSA-pr22-p9rp-2cqv.