CVE-2021-24881: high-severity vulnerability in Passster
Passster < 3.5.5.9 - Protection Bypass & Arbitrary Post Access
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.8%
The Passster WordPress plugin before 3.5.5.9 does not properly check for password, as well as that the post to be viewed is public, allowing unauthenticated users to bypass the protection offered by the plugin, and access arbitrary posts (such as private) content, by sending a specifically crafted request.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
Unknown · PasssterRelated CVEs — Passster
In the same product, most dangerous first.
CVE-2022-3206MEDIUMPassster < 3.5.5.5.2 - Insecure Storage of PasswordEPSS 0.6%CVE-2026-16604HIGHContent Protector (Passster) < 4.3.6 - Unauthenticated Protected Content Disclosure via Content-Lock Block data-content AttributeEPSS 0.4%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%