CWE-754

Improper Check for Unusual or Exceptional Conditions

The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.

CVE-2026-42349 (GCVE-0-2026-42349)

Vulnerability from cvelistv5 – Published: 2026-05-11 16:08 – Updated: 2026-05-14 18:19
VLAI
Title
Clerk: Authorization bypass when combining organization, billing, or reverification checks
Summary
Clerk JavaScript is the official JavaScript repository for Clerk authentication. has(), auth.protect(), and related authorization predicates in @clerk/shared, @clerk/nextjs, @clerk/backend, and other framework SDKs can return true for certain combined authorization checks when the result should be false, allowing a gated action to proceed for a user who does not satisfy the full set of requested conditions. This call shape can be bypassed if certain conditions are met: a has() or auth.protect() call that combines a reverification check with any of role, permission, feature, or plan, or that combines a billing check (feature or plan) with a role or permission check. This vulnerability is fixed in @clerk/clerk-js 5.125.10 and 6.7.5.
Severity
7.6 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-754 - Improper Check for Unusual or Exceptional Conditions
  • CWE-863 - Incorrect Authorization
Assigner
References
Impacted products
Vendor Product Version
clerk javascript Affected: >= 5.22.0, < 5.125.10
Affected: >= 6.0.0, < 6.7.5
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@clerk shared Affected: >= 3.0.0, <= 3.47.4
Affected: >= 4.0.0, <= 4.8.2
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@clerk backend Affected: >= 2.0.0, <= 2.33.2
Affected: >= 3.0.0, <= 3.2.13
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@clerk nextjs Affected: >= 6.0.0, <= 6.39.2
Affected: >= 7.0.0, <= 7.2.3
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@clerk clerk-react Affected: >= 5.9.0, <= 5.61.5
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@clerk react Affected: >= 6.0.0, <= 6.4.2
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@clerk vue Affected: >= 1.0.0, <= 1.17.20
Affected: >= 2.0.0, <= 2.0.15
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@clerk astro Affected: >= 2.0.0, <= 2.17.10
Affected: >= 3.0.0, <= 3.0.17
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@clerk nuxt Affected: >= 1.0.0, <= 1.13.28
Affected: >= 2.0.0, <= 2.2.4
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@clerk clerk-expo Affected: >= 2.2.11, <= 2.19.35
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@clerk expo Affected: >= 3.0.0, <= 3.2.1
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@clerk react-router Affected: >= 0.0.1, <= 2.4.12
Affected: >= 3.0.0, <= 3.1.3
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@clerk tanstack-react-start Affected: >= 0.0.1, <= 0.29.10
Affected: >= 1.0.0, <= 1.1.3
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@clerk chrome-extension Affected: >= 1.3.5, <= 2.9.14
Affected: >= 3.0.0, <= 3.1.14
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@clerk fastify Affected: >= 1.0.42, <= 2.6.30
Affected: >= 3.0.0, <= 3.1.15
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@clerk express Affected: >= 0.1.0, <= 1.7.78
Affected: >= 2.0.0, <= 2.1.5
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@clerk hono Affected: >= 0.0.2, <= 0.1.15
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Show details on NVD website
To clipboard 

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        },
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CVE-2026-42950 (GCVE-0-2026-42950)

Vulnerability from cvelistv5 – Published: 2026-05-13 12:02 – Updated: 2026-05-13 15:05
VLAI
Summary
ELECOM wireless LAN access point devices do not check if language parameter has an appropriate value. If a user views a malicious page while logged in, the admin page on the user's web browser may become broken.
Severity
4.3 (Medium)
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
5.1 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CWE
  • CWE-754 - Improper check for unusual or exceptional conditions
Assigner
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-4643 (GCVE-0-2026-4643)

Vulnerability from cvelistv5 – Published: 2026-05-18 08:43 – Updated: 2026-05-18 14:36
VLAI
Title
Calling window.close() from server-side content causes crash in the Mattermost Desktop App
Summary
Mattermost Desktop App versions <=6.1 6.0.1 5.4.13.0 fail to prevent server-rendered content from closing an underlying application view in the Mattermost Desktop App which allows a malicious server or plugin to crash the desktop client via invoking {{window.close()}} in the renderer context, leading to a denial of service condition at the client level. Mattermost Advisory ID: MMSA-2026-00633
Severity
3.5 (Low)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L
CWE
  • CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
URL Tags
https://mattermost.com/security-updates vendor-advisory
Impacted products
Vendor Product Version
Mattermost Mattermost Affected: 0 , ≤ 6.0.1 (semver)
Affected: 0 , ≤ 5.4.13 (semver)
Unaffected: 6.2.0
Unaffected: 6.1.1.0
Unaffected: 5.13.5.0
Create a notification for this product.
Credits
Devin Binnie
Show details on NVD website
To clipboard 

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CVE-2026-47315 (GCVE-0-2026-47315)

Vulnerability from cvelistv5 – Published: 2026-05-19 06:31 – Updated: 2026-05-19 13:20
VLAI
Summary
Improper Check for Unusual or Exceptional Conditions vulnerability in Samsung Open Source Escargot allows Input Data Manipulation. This issue affects Escargot: 590345cc6258317c5da850d846ce6baaf2afc2d3.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CWE
  • CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
Impacted products
Vendor Product Version
Samsung Open Source Escargot Affected: 590345cc6258317c5da850d846ce6baaf2afc2d3
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-4748 (GCVE-0-2026-4748)

Vulnerability from cvelistv5 – Published: 2026-04-01 06:18 – Updated: 2026-04-01 14:56
VLAI
Title
pf silently ignores certain rules
Summary
A regression in the way hashes were calculated caused rules containing the address range syntax (x.x.x.x - y.y.y.y) that only differ in the address range(s) involved to be silently dropped as duplicates. Only the first of such rules is actually loaded into pf. Ranges expressed using the address[/mask-bits] syntax were not affected. Some keywords representing actions taken on a packet-matching rule, such as 'log', 'return tll', or 'dnpipe', may suffer from the same issue. It is unlikely that users have such configurations, as these rules would always be redundant. Affected rules are silently ignored, which can lead to unexpected behaviour including over- and underblocking.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-480 - Use of Incorrect Operator
  • CWE-754 - Improper Check for Unusual or Exceptional Conditions
  • CWE-1023 - Incomplete Comparison with Missing Factors
Assigner
References
Impacted products
Vendor Product Version
FreeBSD FreeBSD Affected: 15.0-RELEASE , < p5 (release)
Affected: 14.4-RELEASE , < p1 (release)
Affected: 14.3-RELEASE , < p10 (release)
Create a notification for this product.
Date Public
2026-03-26 05:00
Credits
Michael Gmelin
Show details on NVD website
To clipboard 

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CVE-2026-4915 (GCVE-0-2026-4915)

Vulnerability from cvelistv5 – Published: 2026-05-25 07:10 – Updated: 2026-05-26 14:43
VLAI
Title
Server panic via outgoing webhook responses
Summary
Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to filter nil elements from outgoing webhook attachment payloads before processing, which allows an authenticated user to cause a denial of service (server process termination) via a crafted webhook callback response containing a null attachment entry.. Mattermost Advisory ID: MMSA-2026-00641
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
URL Tags
https://mattermost.com/security-updates vendor-advisory
Impacted products
Vendor Product Version
Mattermost Mattermost Affected: 11.6.0 , ≤ 11.6.0 (semver)
Affected: 11.5.0 , ≤ 11.5.3 (semver)
Affected: 11.4.0 , ≤ 11.4.4 (semver)
Affected: 10.11.0 , ≤ 10.11.14 (semver)
Unaffected: 11.7.0
Unaffected: 11.6.1
Unaffected: 11.5.4
Unaffected: 11.4.5
Unaffected: 10.11.15
Create a notification for this product.
Credits
daw10
Show details on NVD website
To clipboard 

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CVE-2026-5946 (GCVE-0-2026-5946)

Vulnerability from cvelistv5 – Published: 2026-05-20 13:10 – Updated: 2026-05-20 13:40
VLAI
Title
Invalid handling of CLASS != IN
Summary
Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Internet (`IN`) — for example, `CHAOS` or `HESIOD`, or DNS messages that specify meta-classes (`ANY` or `NONE`) in the question section. Specially crafted requests reaching the affected code paths — recursion, dynamic updates (`UPDATE`), zone change notifications (`NOTIFY`), or processing of `IN`-specific record types in non-`IN` data — can cause assertion failures in `named`. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-20 - Improper Input Validation
  • CWE-125 - Out-of-bounds Read
  • CWE-617 - Reachable Assertion
  • CWE-754 - Improper Check for Unusual or Exceptional Conditions
  • CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')
Assigner
isc
References
Impacted products
Vendor Product Version
ISC BIND 9 Affected: 9.11.0 , ≤ 9.16.50 (custom)
Affected: 9.18.0 , ≤ 9.18.48 (custom)
Affected: 9.20.0 , ≤ 9.20.22 (custom)
Affected: 9.21.0 , ≤ 9.21.21 (custom)
Affected: 9.11.3-S1 , ≤ 9.16.50-S1 (custom)
Affected: 9.18.11-S1 , ≤ 9.18.48-S1 (custom)
Affected: 9.20.9-S1 , ≤ 9.20.22-S1 (custom)
Create a notification for this product.
Date Public
2026-05-20 00:00
Credits
ISC would like to thank Mcsky23 for bringing this vulnerability to our attention.
Show details on NVD website
To clipboard 

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CVE-2026-8491 (GCVE-0-2026-8491)

Vulnerability from cvelistv5 – Published: 2026-05-19 22:28 – Updated: 2026-05-20 16:36
VLAI
Title
Node View Permissions - Moderately critical - Access bypass - SA-CONTRIB-2026-034
Summary
Improper Check for Unusual or Exceptional Conditions vulnerability in Drupal Node View Permissions allows Forceful Browsing. This issue affects Node View Permissions: from 0.0.0 before 1.7.0, from 2.0.0 before 2.0.1.
Severity
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
Impacted products
Vendor Product Version
Drupal Node View Permissions Affected: 0.0.0 , < 1.7.0 (semver)
Affected: 2.0.0 , < 2.0.1 (semver)
Create a notification for this product.
Date Public
2026-05-13 17:16
Credits
Adam Shepherd (adamps) Bálint Nagy (nagy.balint) Greg Knaddison (greggles) Juraj Nemec (poker10)
Show details on NVD website
To clipboard 

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Mitigation ID: MIT-3

Phase: Requirements

Strategy: Language Selection

Description:

  • Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
  • Choose languages with features such as exception handling that force the programmer to anticipate unusual conditions that may generate exceptions. Custom exceptions may need to be developed to handle unusual business-logic conditions. Be careful not to pass sensitive exceptions back to the user (CWE-209, CWE-248).
Mitigation

Phase: Implementation

Description:

  • Check the results of all functions that return a value and verify that the value is expected.
Mitigation

Phase: Implementation

Description:

  • If using exception handling, catch and throw specific exceptions instead of overly-general exceptions (CWE-396, CWE-397). Catch and handle exceptions as locally as possible so that exceptions do not propagate too far up the call stack (CWE-705). Avoid unchecked or uncaught exceptions where feasible (CWE-248).
Mitigation ID: MIT-39

Phase: Implementation

Description:

  • Ensure that error messages only contain minimal details that are useful to the intended audience and no one else. The messages need to strike the balance between being too cryptic (which can confuse users) or being too detailed (which may reveal more than intended). The messages should not reveal the methods that were used to determine the error. Attackers can use detailed information to refine or optimize their original attack, thereby increasing their chances of success.
  • If errors must be captured in some detail, record them in log messages, but consider what could occur if the log messages can be viewed by attackers. Highly sensitive information such as passwords should never be saved to log files.
  • Avoid inconsistent messaging that might accidentally tip off an attacker about internal state, such as whether a user account exists or not.
  • Exposing additional information to a potential attacker in the context of an exceptional condition can help the attacker determine what attack vectors are most likely to succeed beyond DoS.
Mitigation ID: MIT-5

Phase: Implementation

Strategy: Input Validation

Description:

  • Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
  • When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
  • Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
Mitigation ID: MIT-38

Phases: Architecture and Design, Implementation

Description:

  • If the program must fail, ensure that it fails gracefully (fails closed). There may be a temptation to simply let the program fail poorly in cases such as low memory conditions, but an attacker may be able to assert control before the software has fully exited. Alternately, an uncontrolled failure could cause cascading problems with other downstream components; for example, the program could send a signal to a downstream process so the process immediately knows that a problem has occurred and has a better chance of recovery.
Mitigation

Phase: Architecture and Design

Description:

  • Use system limits, which should help to prevent resource exhaustion. However, the product should still handle low resource conditions since they may still occur.

No CAPEC attack patterns related to this CWE.

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