Information disclosure in Passster

CVE-2026-16604

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.

Vulnerability class: Information Disclosure

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (37.7th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 37.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-16604: held from 0.004 to 0.004.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

  • Passster — versions 0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-16604?
CVE-2026-16604 is a high-severity vulnerability in Passster, classified under Information Disclosure. CVSS score: 7.5/10. Published 2026-08-05.
How severe is CVE-2026-16604?
High severity. CVSS v3 base score is 7.5 out of 10.