CVE-2026-16603 Content Protector (Passster) < 4.3.6 - Unauthenticated Category-Locked Content Disclosure via Core REST API
Unauthenticated attackers can bypass category-based content protection to read full post content via the WordPress REST API.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-16603?
CVE-2026-16603 is a high-severity missing authorization vulnerability in Unknown Passster, published on 5 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Passster WordPress plugin before 4.3.6 does not enforce its category-based content protection on the WordPress REST API, allowing unauthenticated users to read the full content, title, and excerpt of category-locked posts through the core REST API.
Weakness: CWE-200
Which versions are affected by CVE-2026-16603?
How do I fix CVE-2026-16603?
No fix has been published for CVE-2026-16603 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-16603 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-16603 exists.
Sources
Also known as GHSA-w2h3-gqm7-9j89.