Weakness (CWE)
CWE-307: Improper Restriction of Excessive Authentication Attempts
The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame.
How to prevent it (2 mitigations)
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Architecture and Design
Common protection mechanisms include:
- Disconnecting the user after a small number of failed attempts
- Implementing a timeout
- Locking out a targeted account
- Requiring a computational task on the user's part.
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Architecture and Design
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482].
Consider using libraries with authentication capabilities such as OpenSSL or the ESAPI Authenticator. [REF-45]
Source: MITRE CWE-307
211 results · Clear filters · Feed
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Medium 6.9
Bruteforce Protection Bypass in WidzialniCMS
WidzialniCMS is vulnerable to Bruteforce Protection Bypass in the login functionality. The cookie-based lockout can be bypassed by omitting the login_count and login_timeout cookies, allowing an unauthenticated attacker to perform an unlimited number of login…
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Medium 5.9
Vikunja before 2.7.1 Password Brute-Force via TOTP Disable Endpoint
Vikunja before 2.7.1 contains an improper restriction of excessive authentication attempts vulnerability that allows session holders to brute-force account passwords via unthrottled re-authentication endpoints. Attackers with a stolen session can guess the pa…
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Medium 5.3
HCL AION is affected by multiple security vulnerabilities.
HCL AION is affected by a vulnerability where the account lockout mechanism did not sufficiently restrict repeated failed login attempts, allowing an attacker to make a large number of password guesses against a user account. This may increase the risk of acc…
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Medium 5.3
BlueprintUE Self-Hosted Edition 4.2.0 before 4.3.4 Login Rate Limit Bypass
BlueprintUE Self-Hosted Edition 4.2.0 before 4.3.4 contains a login rate limit bypass vulnerability in LoginMiddleware.php that keys failed-login counters on case-sensitive usernames. Unauthenticated attackers can vary username casing against case-insensitive…
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Medium 5.9
ProSoft ICX35 Login Lockout Bypass via Client-Side Cookies
ProSoft Technology ICX35 devices (X35-HWC-A and ICX35-HWC-E) contain a login lockout bypass in the integrated module web page. The account lockout mechanism that restricts repeated failed authentication attempts is enforced in client-side JavaScript, so a rem…
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Medium 6.3
AshAuthentication brute_force_strategy does not limit sign-in and request actions defined on the resource
Improper Restriction of Excessive Authentication Attempts vulnerability in team-alembic ash_authentication allows an unauthenticated attacker to guess passwords and one-time passwords without limit. The password, magic link and OTP strategies enforce brute_fo…
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Medium 5.4
Dell OpenManage Enterprise, versions prior to 4.8.0, contains an Improper Restriction of Excessive Authentication Attem…
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Medium 5.3
Missing brute-force protection for web interface
HTTP basic auth enforces no retry limit or backoff. Combined with the default service password, the keyspace is exhaustible.
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Medium 5.3
Shield - Moderately critical - Access bypass - SA-CONTRIB-2026-248
Improper Restriction of Excessive Authentication Attempts vulnerability in Drupal Shield allows Brute Force. This issue affects Shield versions: from 0.0.0 to 1.9.0.
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Medium 5.3
OTP Brute-Force Account Takeover in Idvlabs Software's Ontime
Improper restriction of excessive authentication attempts vulnerability in İdvlabs Software and Consulting Services Inc. Ontime allows Brute Force. This issue affects Ontime: through 2026-10-27. NOTE: The vendor was contacted early about this disclosure but …
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Medium 6.3
Lack of rate-limiting in 2fa code check mechanism in twofactor_gauthenticator
The twofactor_gauthenticator plugin for Roundcube is vulnerable to brute-forcing of the second-factor code. Due to the lack of rate limiting, an attacker who obtains user's password can submit arbitrary 6-digit codes, resulting in second-factor bypass and una…
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Medium 5.9
ApostropheCMS: No Attempt Throttling on Authenticated Password-Change Endpoint Enables Unlimited Current-Password Guessing
ApostropheCMS is an open-source Node.js content management system. Prior to 4.33.0, the self-service password-change endpoint verifies the current password but does not use the login module’s failed-attempt counter, throttle, delay, or lockout mechanism. An a…
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Medium 4.8
Password Brute Force via Password History Validation in Multiple WSO2 Products Allows User Account Discovery
The RemoteUserStoreManagerService does not sufficiently validate password change attempts when the password history validation feature is enabled. This oversight allows an attacker to repeatedly attempt password guesses for a user account without being adequa…
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Medium 6.9
FOSSBilling: Unauthenticated client account enumeration via guest signup endpoint
FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.7, the unauthenticated POST /api/guest/client/create endpoint reveals whether a submitted email belongs to a registered client because guest signup returns a distinct u…
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Medium 6.5
phpMyFAQ 4.2.0-alpha before 4.2.0-beta Missing Rate Limiting on Password-Reset Endpoints
phpMyFAQ 4.2.0-alpha before 4.2.0-beta lacks effective rate limiting on the unauthenticated user/password/update and user/password/reset endpoints. Unauthenticated attackers can send unlimited reset requests to flood a registered user's inbox with reset email…
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Medium 6.5
phpMyFAQ 4.2.0-alpha.2 before 4.2.0-beta 2FA Brute-Force via remove-twofactor Endpoint
phpMyFAQ from 4.2.0-alpha.2 before 4.2.0-beta lacks brute-force lockout in the removeTwofactorConfig() 2FA removal endpoint, allowing authenticated attackers to guess TOTP codes without limit. Attackers holding a hijacked session and CSRF token can repeatedly…
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Medium 6.5
FileRise: Rate Limiting Bypass via Username Rotation Enables Unlimited Password Spraying
FileRise is a self-hosted web-based file manager with multi-file upload, editing, and batch operations. Prior to 3.21.0, FileRise tracks failed logins only by the combination of source IP address and username. A remote unauthenticated attacker can rotate user…
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Medium 5.3
Wazuh 4.0.0 before 4.14.8 API Brute-Force Protection Bypass via Race Condition
Wazuh from 4.0.0 before 4.14.8 contains a race condition in API login throttling that allows unauthenticated attackers to bypass max_login_attempts by sending concurrent requests. Attackers can fire concurrent login bursts to the authenticate and run_as endpo…
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Medium 6.5
FreeRDP 3.0.0 before 3.32.0 PIN Brute-Force via Virtual Smartcard
FreeRDP 3.0.0 before 3.32.0 contains an improper restriction of excessive authentication attempts in its virtual smartcard GIDS implementation, which stores the PIN retry counter per-handle. A malicious RDP server can exhaust the counter with VERIFY APDUs, th…
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Medium 5.3
IBM i Information Disclosure
IBM i 7.3, 7.4, 7.5, and 7.6 could allow a remote attacker to perform brute-force attacks to obtain credentials due to improper authentication.
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Medium 6.5
AniWorld Downloader before 5.3.0 WebUI Login Brute Force via /login
AniWorld Downloader before 5.3.0 contains an improper restriction of authentication attempts vulnerability in the WebUI /login POST handler that allows unauthenticated attackers to guess passwords without throttling. Attackers can enumerate usernames through …
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Medium 6.5
Pingvin Share X before 1.22.0 Ineffective Authentication Rate Limiting via Throttler TTL
Pingvin Share X before 1.22.0 contains an ineffective rate limiting vulnerability because throttler TTL values specified in seconds are interpreted as milliseconds. Unauthenticated attackers can send effectively unthrottled requests to /api/auth/signIn, /api/…
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Medium 6.8
pH7Builder before 18.5.0 2FA Brute Force via VerificationCodeFormProcess.php
pH7Builder (pH7 Social Dating CMS) before 18.5.0 contains an improper restriction of authentication attempts vulnerability that allows attackers to bypass two-factor authentication by guessing TOTP codes without limits. Attackers who know an account password …
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Medium 6.9
Payload: Unauthenticated account-lockout denial of service
Payload is a free and open source headless content management system. In versions before 3.90.0 and canary versions before 4.0.0-canary.34, an unauthenticated attacker who knows an account email address or username can abuse the account lockout mechanism of a…
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Medium 6.5
stoatchat before 0.15.5 MFA Brute Force via Insufficient Rate Limiting
stoatchat before 0.15.5 fails to enforce account-level attempt limits on MFA login challenges, allowing attackers who know a password to guess TOTP codes with only IP-based rate limiting. Attackers can reuse MFA challenge tickets across multiple failed attemp…
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Medium 6.5
Flame through 2.4.0 Brute-Force Attack via Login Endpoint
Flame through 2.4.0 contains an improper restriction of excessive authentication attempts vulnerability in the POST /api/auth login endpoint that allows unauthenticated attackers to brute-force the admin password. Attackers can submit unlimited password guess…
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Medium 6.9
Zammad: Missing rate limiting allows password brute-forcing during two-factor login
Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, the two-factor login step let an attacker try unlimited password guesses for any account without triggering Zammad's normal lockout or rate limiting. The response also reveale…
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Medium 5.3
9Router: Login Brute-Force Lockout Bypass via Spoofable X-9r-Real-Ip Header
9Router is an AI router & token saver. Prior to 0.5.6, 9Router deployments that allow requests to reach Next.js without the sanitizing custom-server.js wrapper use the client-supplied X-9r-Real-Ip value as the bucket key in getClientIp, checkLock, and recordF…
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Medium 6.5
Improper Restriction of Excessive Authentication Attempts in the administration login of pH7Software pH7Builder (pH7 So…
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Medium 6.8
@sync-in/server vulnerable to TOTP Brute-Force via `POST /api/app/sync/register`
Sync-in Server is an open-source platform for file storage, sharing, collaboration, and syncing. Prior to version 2.4.0, `POST /api/app/sync/register` accepts credentials and a TOTP code to register a desktop sync client. On a failed TOTP, `SyncClientsManager…
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Medium 5.3
Tinyauth: Unauthenticated login attempts can trigger global login lockdown denial of service
Tinyauth is an authentication and authorization server. Prior to 5.1.0, an unauthenticated remote attacker can send POST /api/user/login requests with 257 distinct nonexistent usernames to fill MaxLoginAttemptRecords and activate a global login lockdown. inte…
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Medium 6.5
HCL BigFix Service Management is affected by multiple security vulnerabilities.
HCL BigFix Service Management is affected by an Improper Authentication validation vulnerability related to inadequate account lockouts, which could allow an unauthenticated attacker to execute sustained brute-force attacks against the login interface, result…
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Medium 6.5
AVideo through 29.0 Rate Limit Bypass via Non-Atomic Counter Increment
AVideo through 29.0 contains a race condition in the enforceRateLimit() function that fails to atomically increment rate limit counters, allowing attackers to bypass all rate limits including login brute-force protection by issuing concurrent requests. Attack…
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Medium 6.3
Payara Server is vulnerable to brute-force login attacks due to the absence of a limit on failed login attempts
By default, Payara Server does not limit the number of failed login attempts, which can leave it vulnerable to brute force login attacks. To mitigate this, Payara Server includes built-in automatic attack protection. For configuration details, see https://do…
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Medium 6.9
Craft Commerce: Coupon Code Brute-Force via Rate Limit Bypass
Craft Commerce is an ecommerce platform for Craft CMS. From 4.0.0 until 4.11.2 and 5.6.5, CartController in src/controllers/CartController.php activates its RateLimiter only when the number POST or GET parameter is supplied. An unauthenticated attacker can su…
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Medium 6.5
Keycloak-services: keycloak-services: device authorization grant issues tokens to brute-force-locked accounts
A flaw was found in the Device Authorization Grant flow of Keycloak, an identity and access management solution. The issue occurs because the token redemption process fails to check if a user account is currently locked due to brute-force protection. If an at…
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Medium 4.4
In Audio HAL, there is a possible information disclosure due to a missing permission check. This could lead to local in…
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Medium 6.7
In Audio HAL, there is a possible escalation of privilege due to improper input validation. This could lead to local es…
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Medium 6.5
AVideo API Rate Limit Bypass via Bot User-Agent Header
AVideo API fails to enforce rate limits when clients send a bot User-Agent header, allowing attackers to bypass all eight protected operations including login brute-force protection. Attackers can send requests with a bot User-Agent to disable rate limiting a…
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Medium 6.9
CWE-307: Improper Restriction of Excessive Authentication Attempts vulnerability exists that could allow an attacker to…