CVE-2026-16604highCWE-200

CVE-2026-16604: high-severity vulnerability in Passster

Content Protector (Passster) < 4.3.6 - Unauthenticated Protected Content Disclosure via Content-Lock Block data-content Attribute

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41Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 7.5epss 0.4%
The Passster WordPress plugin before 4.3.6 outputs password-protected block content in the public page response before verifying the password, allowing unauthenticated users to recover the protected content without knowing the password.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
Unknown · Passster
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — Passster

In the same product, most dangerous first.

CVE-2021-24881HIGHPassster < 3.5.5.9 - Protection Bypass & Arbitrary Post AccessEPSS 0.8%CVE-2022-3206MEDIUMPassster < 3.5.5.5.2 - Insecure Storage of PasswordEPSS 0.6%CVE-2026-16603HIGHContent Protector (Passster) < 4.3.6 - Unauthenticated Category-Locked Content Disclosure via Core REST APIEPSS 0.4%CVE-2026-16602HIGHContent Protector (Passster) < 4.3.6 - Unauthenticated Non-Public Post Content Disclosure via Captcha REST EndpointEPSS 0.4%CVE-2021-24837—Passster < 3.5.5.8 - Contributor+ Stored Cross-Site ScriptingEPSS 0.4%CVE-2025-15490MEDIUMPassster < 4.2.26 - Global Protection BypassEPSS 0.4%