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Vulnerabilities CVE-2026-49953

CVE-2026-49953

Medium
Open
TLP:CLEAR

Discuz! X5.0 CAPTCHA Bypass via Predictable Character Set

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Description

Discuz! X5.0 releases 20260320 through 20260610 contains a CAPTCHA bypass vulnerability that allows unauthenticated remote attackers to defeat challenge controls by exploiting limited complexity and predictable character sets in generated CAPTCHA images. Attackers can train a custom optical character recognition model against collected CAPTCHA samples to reliably predict challenge text, bypassing protections on login, registration, and other functionality from automated abuse.

Details

CVSS Score
6.9
EPSS Score
0.36%

29th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Confidence
90%
Published
Jun 15, 2026
Last Modified
Jul 28, 2026
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