CVE-2026-49953
MEDIUM
6,9
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Confidentiality: N/A
Integrity: N/A
Availability: N/A
MEDIUM
6,5
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: low
Integrity: low
Availability: none
Description
AI Translation Available
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.
EPSS (Exploit Prediction Scoring System)
Trend Analysis
EPSS (Exploit Prediction Scoring System)
Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.
EPSS Score
0,0036
Percentile
0,3th
Updated
Single Data Point
Only one EPSS measurement is available for this CVE. Trend analysis requires multiple data points over time.
804
Guessable CAPTCHA
IncompleteCommon Consequences
Security Scopes Affected:
Access Control
Other
Potential Impacts:
Bypass Protection Mechanism
Other
Applicable Platforms
Technologies:
Web Server
http://seclists.org/fulldisclosure/2026/Jun/4
https://karmainsecurity.com/chaining-bugs-in-discuz-from-race-condition-to-rce
https://karmainsecurity.com/KIS-2026-10
https://www.vulncheck.com/advisories/discuz-x5-0-captcha-bypass-via-predictable…