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This vulnerability exploits the absence of rate-limiting controls on the Shiori web application’s login endpoint. The login function does not track or restrict the number of failed authentication attempts from a single source IP address or user session. An attacker can systematically submit a high volume of login requests with different password guesses against a known username. Without countermeasures like account lockouts, progressive delays, or CAPTCHA challenges, the attacker can continue brute-forcing indefinitely. This allows for the eventual discovery of valid credentials through automated scripting. The attack leverages the predictable nature of HTTP POST requests to the `/login` path, requiring no prior authentication or complex manipulation of the application state. Successful exploitation leads to full authentication bypass and unauthorized access to the bookmark management interface and stored data.
Platform: Shiori
Version: <=1.7.4
Vulnerability: Authentication Bypass
Severity: Moderate
date: 2026-01-09
Prediction: Patch by 2026-01-23
What Undercode Say:
Analytics
`grep -r “login” shiori/routes/`
`tail -f /var/log/shiori/access.log | grep POST`
`hydra -L users.txt -P rockyou.txt http-post-form://target:8080/login:username=^USER^&password=^PASS^:F=Invalid`
How Exploit:
1. Enumerate a valid username.
2. Craft iterative login POST requests.
3. Use wordlist for password candidates.
4. Script the attack for automation.
5. Gain authenticated session cookie.
Protection from this CVE
Implement login rate-limiting.
Add account lockout policy.
Require strong passwords.
Deploy fail2ban rules.
Use multi-factor authentication.
Impact:
Unauthorized data access.
Data modification or deletion.
Potential initial foothold.
Loss of confidentiality.
Compromised user account.
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Sources:
Reported By: github.com
Extra Source Hub:
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