Authentication bypass using an alternate path or channel in CAPTCHA - CVE-2026-118582
Published: October 30, 2026
Vulnerability identifier: #VU158571
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-118582
CWE-ID: CWE-288
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to the affected module does not fully invalidate a solved CAPTCHA session. A remote attacker can bypass the CAPTCHA on subsequent submissions.
Affected software
CAPTCHA
How to mitigate CVE-2026-118582
Install updates from vendor's website.
CAPTCHA - addressed in versions 1.18.0, 2.0.11