CVE-2026-88997 JSM Show Post Metadata < 4.9.1 - Contributor+ Stored XSS via Custom Field Meta Key
Contributors can inject JavaScript via post meta keys, leading to session hijacking of higher-privileged users reviewing posts.
- 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
- None listed
What is CVE-2026-88997?
CVE-2026-88997 is a medium-severity cross-site scripting vulnerability in Unknown JSM Show Post Metadata, published on 23 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
The JSM Show Post Metadata WordPress plugin before 4.9.1 does not properly escape a post meta key before outputting it into an inline event-handler attribute in an admin-facing meta box, allowing users with contributor-level access and above to inject arbitrary JavaScript that executes in the session of a higher-privileged user who reviews the affected post.
Weakness: CWE-79
Which versions are affected by CVE-2026-88997?
How do I fix CVE-2026-88997?
No fix has been published for CVE-2026-88997 yet. Limit exposure of the affected software until one is available.
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-2026-88997 being exploited?
There is no known exploitation of CVE-2026-88997 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-w38r-xjmg-mmg7.