CVE-2026-17559

The Passster WordPress plugin before 4.3.9 does not correctly match its own public endpoint paths when deciding which REST API requests may bypass global password protection, comparing them as an unanchored substring of the request URI rather than against the resolved route, allowing an unauthenticated attacker to read the content of globally password-protected posts and pages.

CVSS v3.1

5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS

0.26% chance of exploitation in the next 30 days, 17th percentile

Published

2026-08-21

Proof-of-concept exploits (1)

• https://wpscan.com/vulnerability/28a48c1c-e162-4e8a-b450-5568fb3a3fc8/

References

• CVE Record
• NVD entry

Related

• CVE-2026-17544
• CVE-2026-17565
• CVE-2026-17543
• CVE-2026-17566
• CVE-2026-17542
• CVE-2026-17583