High severity · published Aug 5, 2026
CVE-2026-16603
Content Protector (Passster) < 4.3.6 - Unauthenticated Category-Locked Content Disclosure via Core REST API
7.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PA
Passster ·
before 4.3.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-16603
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-16603
wpscan.com
https://wpscan.com/vulnerability/ec56a66e-e98a-4260-a0af-3ef6905ce839/
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