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Common Weakness Enumeration

CWE-307

Allowed

Improper Restriction of Excessive Authentication Attempts

Abstraction: Base · Status: Draft

API response cwe.mitre.org

The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame.

1000 vulnerabilities reference this CWE, most recent first.

CVE-2026-92082 (GCVE-0-2026-92082)

Vulnerability from cvelistv5 – Published: 2026-09-15 14:04 – Updated: 2026-09-15 14:58 X_Open Source
VLAI
Title
Payara Server is vulnerable to brute-force login attacks due to the absence of a limit on failed login attempts
Summary
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://docs.azul.com/payara/technical-documentation/payara-server-documentation/security-guide/administering-system-security.html .
Severity
6.3 (Medium)
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:N/SA:N/AU:Y/R:U/V:C/RE:L/U:Amber
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-15 14:58 UTC
CWE
  • CWE-307 - Improper restriction of excessive authentication attempts
Assigner
References
Impacted products
Vendor Product Version
Payara Payara Server Affected: 7.0.0 , < 7.2.0 (semver)
Affected: 7.2025.1 , < 7.2026.7 (custom)
Affected: 6.0.0 , < 6.40.0 (semver)
Affected: 5.20.0 , < 5.89.0 (semver)
Affected: 4.1.144 , < 4.1.2.191.57 (custom)
Affected: 6.2023.1 (custom)
Affected: 5.2020.1 (custom)
Create a notification for this product.
Date Public
2026-09-15 13:09
Show details on NVD website
To clipboard 

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CVE-2026-91973 (GCVE-0-2026-91973)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:18 – Updated: 2026-09-15 15:55
VLAI
Title
Vikunja before 2.6.0 Authentication Bypass via CalDAV BasicAuth
Summary
Vikunja before 2.6.0 contains an authentication bypass vulnerability in CalDAV BasicAuth endpoints that lack rate limiting protection. Remote unauthenticated attackers can issue unbounded credential-guessing requests against /dav, /.well-known, and /feeds routes to bypass the instance's anti-brute-force controls and compromise password-only accounts.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-15 15:53 UTC
CWE
  • CWE-307 - Improper Restriction of Excessive Authentication Attempts
Assigner
References
Impacted products
Vendor Product Version
go-vikunja vikunja Affected: 0 , < 2.6.0 (semver)
Unaffected: 2.6.0 (semver)
    cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-31 00:00
Credits
JellowBeanz26
Show details on NVD website
To clipboard 

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CVE-2026-91972 (GCVE-0-2026-91972)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:18 – Updated: 2026-09-15 15:18
VLAI
Title
Vikunja before 2.6.0 Authentication Bypass via Unthrottled API
Summary
Vikunja versions before 2.6.0 fail to apply rate limiting to /api/v2 public authentication endpoints including login, register, password-reset, and OAuth token routes. Remote unauthenticated attackers can perform unbounded credential guessing, account enumeration, and password-reset flooding attacks without throttling restrictions.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-307 - Improper Restriction of Excessive Authentication Attempts
Assigner
References
Impacted products
Vendor Product Version
go-vikunja vikunja Affected: 0 , < 2.6.0 (semver)
Unaffected: 2.6.0 (semver)
    cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-31 00:00
Credits
JellowBeanz26
Show details on NVD website
To clipboard 

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CVE-2026-89174 (GCVE-0-2026-89174)

Vulnerability from cvelistv5 – Published: 2026-09-11 07:31 – Updated: 2026-09-11 15:49
VLAI
Title
Kingdom Communication Associated｜Smart Video Intercom System - Missing Burte-force Protection
Summary
Smart Video Intercom System developed by Kingdom Communication Associated has a Missing Brute-force Protection vulnerability. Unauthenticated remote attackers can gain access to valid accounts through a large number of login attempts.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-11 15:47 UTC
CWE
  • CWE-307 - Improper Restriction of Excessive Authentication Attempts
Assigner
References
Impacted products
Date Public
2026-09-11 07:28
Show details on NVD website
To clipboard 

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CVE-2026-88770 (GCVE-0-2026-88770)

Vulnerability from cvelistv5 – Published: 2026-09-10 07:18 – Updated: 2026-09-10 10:49
VLAI
Title
Keycloak-services: keycloak-services: device authorization grant issues tokens to brute-force-locked accounts
Summary
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 attacker has an active session for a locked account, they can complete the device login process and receive new security tokens. This allows the attacker to maintain access to the account even when it should be temporarily disabled to prevent unauthorized entry.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-10 10:49 UTC
CWE
  • CWE-307 - Improper Restriction of Excessive Authentication Attempts
Assigner
References
URL Tags
https://access.redhat.com/security/cve/CVE-2026-88770 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2531302 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat Red Hat Build of Keycloak     cpe:/a:redhat:build_keycloak:
Create a notification for this product.
Red Hat Red Hat Single Sign-On 7     cpe:/a:redhat:red_hat_single_sign_on:7
Create a notification for this product.
Date Public
2026-09-09 17:32
Credits
Red Hat would like to thank Sunil Tripathy for reporting this issue.
Show details on NVD website
To clipboard 

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CVE-2026-86729 (GCVE-0-2026-86729)

Vulnerability from cvelistv5 – Published: 2026-09-08 15:14 – Updated: 2026-09-10 15:02
VLAI
Title
WWBN AVideo Unrestricted Authentication Attempts via get_api_preauthorize
Summary
WWBN AVideo through commit e01e41ecc (no patched version available) exposes get_api_preauthorize in plugin/API/API.php as a second, undocumented login path. Unlike get_api_signIn, which enforces a rate limit of 10 attempts per 5 minutes via checkRateLimit(), get_api_preauthorize performs the same credential check with no throttling for any client, allowing unlimited remote password guessing against arbitrary accounts, including admin. The endpoint also acts as a credential oracle: it returns the message "Invalid credentials" for both correct and incorrect passwords, while the users_id field in the response body discloses the authenticated identity (users_id:1 on success, users_id:0 on failure), and a correct password establishes a session cookie that remains usable for authenticated API requests. Together these issues permit unauthenticated brute-force account takeover.
Severity
9.1 (Critical)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-10 14:18 UTC
CWE
  • CWE-307 - Improper Restriction of Excessive Authentication Attempts
Assigner
References
Impacted products
Vendor Product Version
WWBN AVideo Affected: 0 , ≤ 29.0 (custom)
    cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-24 00:00
Credits
rajivraj
Show details on NVD website
To clipboard 

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CVE-2026-86186 (GCVE-0-2026-86186)

Vulnerability from cvelistv5 – Published: 2026-09-05 12:09 – Updated: 2026-09-08 17:20
VLAI
Title
AVideo API Rate Limit Bypass via Bot User-Agent Header
Summary
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 and perform unlimited password guessing attempts against any account from a single IP address.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 17:19 UTC
CWE
  • CWE-307 - Improper Restriction of Excessive Authentication Attempts
Assigner
References
Impacted products
Vendor Product Version
WWBN AVideo Affected: 0 , ≤ 29.0 (custom)
    cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-21 00:00
Credits
rajivraj
Show details on NVD website
To clipboard 

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CVE-2026-85237 (GCVE-0-2026-85237)

Vulnerability from cvelistv5 – Published: 2026-09-03 15:22 – Updated: 2026-09-03 15:42
VLAI
Title
Missing Rate Limiting in Email OTP Verification Allows Brute-Force Authentication Bypass
Summary
A vulnerability in MISP's email-based one-time password (OTP) authentication flow allowed an attacker to perform an unrestricted number of OTP verification attempts. The email_otp() endpoint did not apply brute-force protection when validating submitted OTP values. An attacker who had reached the OTP verification stage, for example after successfully providing a user's primary authentication credentials, could repeatedly submit candidate OTP values while the same OTP remained valid. This significantly increased the feasibility of guessing the OTP and bypassing the additional authentication factor, potentially resulting in unauthorized access to the affected user's account. The issue was exacerbated by the fact that the OTP is associated with the user rather than with an individual pending login session, allowing multiple concurrent sessions to attempt guesses against the same valid OTP. The patch integrates the existing MISP brute-force protection mechanism into the email OTP flow. Failed OTP attempts are now counted against the user, further attempts are rejected once the configured threshold is reached, and the active OTP is invalidated when the attempt budget is exhausted. Blocklisted users are also prevented from requesting the generation of a fresh OTP. In addition, OTP comparison now uses hash_equals() and validates that the submitted value is a string.
Severity
8.6 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:L/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-03 15:42 UTC
CWE
  • CWE-307 - Improper Restriction of Excessive Authentication Attempts
Assigner
References
Impacted products
Vendor Product Version
misp misp Affected: 0 , ≤ 2.5.45 (semver)
Create a notification for this product.
Credits
Scottish Government — National Cyber Team Peter James Andras Iklody (the Insomniac MISP lead dev)
Show details on NVD website
To clipboard 

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CVE-2026-82644 (GCVE-0-2026-82644)

Vulnerability from cvelistv5 – Published: 2026-08-30 14:33 – Updated: 2026-09-01 14:04
VLAI
Title
WWBN AVideo Brute-force Rate Limiting Bypass via Missing User-Agent
Summary
WWBN AVideo (current e01e41ecc and earlier) contains a brute-force rate limiting bypass in enforceRateLimit(), which protects login.json.php and 13 other endpoints. The function stores its attempt counter via a cache layer (ObjectYPT::setCacheGlobal) that silently discards writes for any client identified as a bot by isBot(). Because isBot() treats a missing User-Agent header as a bot by default — and also matches common bot identifiers such as 'curl', 'bot', 'crawler', and 'spider' — the counter never increments for such clients, so the rate limit never fires. An unauthenticated attacker can therefore submit unlimited login attempts (e.g., by omitting the User-Agent header or using curl's default User-Agent), enabling unrestricted password-guessing attacks.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-01 14:04 UTC
CWE
  • CWE-307 - Improper Restriction of Excessive Authentication Attempts
Assigner
References
Impacted products
Vendor Product Version
WWBN AVideo     cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-14 00:00
Credits
rajivraj
Show details on NVD website
To clipboard 

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CVE-2026-82643 (GCVE-0-2026-82643)

Vulnerability from cvelistv5 – Published: 2026-08-30 14:33 – Updated: 2026-09-02 16:03
VLAI
Title
WWBN AVideo Unauthenticated Rate Limit Bypass via preauthorize.json.php
Summary
WWBN AVideo contains an unauthenticated credential submission vulnerability in plugin/Live/api/preauthorize.json.php that accepts credentials over GET without rate limiting. Attackers can submit correct credentials repeatedly to trigger uncapped two-factor confirmation emails and perform sustained password guessing attacks against user accounts.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 16:03 UTC
CWE
  • CWE-307 - Improper Restriction of Excessive Authentication Attempts
Assigner
References
Impacted products
Vendor Product Version
WWBN AVideo     cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-14 00:00
Credits
rajivraj
Show details on NVD website
To clipboard 

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Mitigation
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.
Mitigation MIT-4
Architecture and Design

Strategy: Libraries or Frameworks

  • 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]
CAPEC-16: Dictionary-based Password Attack

An attacker tries each of the words in a dictionary as passwords to gain access to the system via some user's account. If the password chosen by the user was a word within the dictionary, this attack will be successful (in the absence of other mitigations). This is a specific instance of the password brute forcing attack pattern.

Dictionary Attacks differ from similar attacks such as Password Spraying (CAPEC-565) and Credential Stuffing (CAPEC-600), since they leverage unknown username/password combinations and don't care about inducing account lockouts.

CAPEC-49: Password Brute Forcing

An adversary tries every possible value for a password until they succeed. A brute force attack, if feasible computationally, will always be successful because it will essentially go through all possible passwords given the alphabet used (lower case letters, upper case letters, numbers, symbols, etc.) and the maximum length of the password.

CAPEC-560: Use of Known Domain Credentials

An adversary guesses or obtains (i.e. steals or purchases) legitimate credentials (e.g. userID/password) to achieve authentication and to perform authorized actions under the guise of an authenticated user or service.

CAPEC-565: Password Spraying

In a Password Spraying attack, an adversary tries a small list (e.g. 3-5) of common or expected passwords, often matching the target's complexity policy, against a known list of user accounts to gain valid credentials. The adversary tries a particular password for each user account, before moving onto the next password in the list. This approach assists the adversary in remaining undetected by avoiding rapid or frequent account lockouts. The adversary may then reattempt the process with additional passwords, once enough time has passed to prevent inducing a lockout.

CAPEC-600: Credential Stuffing

An adversary tries known username/password combinations against different systems, applications, or services to gain additional authenticated access. Credential Stuffing attacks rely upon the fact that many users leverage the same username/password combination for multiple systems, applications, and services.

CAPEC-652: Use of Known Kerberos Credentials

An adversary obtains (i.e. steals or purchases) legitimate Kerberos credentials (e.g. Kerberos service account userID/password or Kerberos Tickets) with the goal of achieving authenticated access to additional systems, applications, or services within the domain.

CAPEC-653: Use of Known Operating System Credentials

An adversary guesses or obtains (i.e. steals or purchases) legitimate operating system credentials (e.g. userID/password) to achieve authentication and to perform authorized actions on the system, under the guise of an authenticated user or service. This applies to any Operating System.

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