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Common Weakness Enumeration

CWE-636

Allowed-with-Review

Not Failing Securely ('Failing Open')

Abstraction: Class · Status: Draft

When the product encounters an error condition or failure, its design requires it to fall back to a state that is less secure than other options that are available, such as selecting the weakest encryption algorithm or using the most permissive access control restrictions.

99 vulnerabilities reference this CWE, most recent first.

CVE-2026-86120 (GCVE-0-2026-86120)

Vulnerability from cvelistv5 – Published: 2026-09-05 09:59 – Updated: 2026-09-08 18:11
VLAI
Title
APITable through 1.13.0-beta.1 Fail-Open Authorization in the Fusion API Node Permission Guard
Summary
APITable through 1.13.0-beta.1 contains an incorrect authorization vulnerability in NodePermissionGuard that fails to enforce node-level access control when permission lookups throw exceptions. Attackers with valid Fusion API tokens can write attachments to private datasheets they have been explicitly denied access to by exploiting the unhandled exception in the permission guard.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 18:10 UTC
CWE
  • CWE-636 - Not Failing Securely ('Failing Open')
Impacted products
Vendor Product Version
apitable apitable Affected: 0 , ≤ 1.13.0-beta.1 (custom)
Create a notification for this product.
Date Public
2026-07-01 00:00
Show details on NVD website

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CVE-2026-85649 (GCVE-0-2026-85649)

Vulnerability from cvelistv5 – Published: 2026-09-04 12:59 – Updated: 2026-09-04 17:59
VLAI
Summary
(Holloway) Chew, Kean Ho's Actualizer v1.2.0 and earlier contains a fail-open password validation vulnerability in the Alpha user and root user password loops of Shell/debian-minbase-install.sh. The installer invokes mkpasswd to generate yescrypt password hashes but does not check the command's return value and unconditionally accepts the result. If mkpasswd fails to generate a yescrypt hash, for example because an incompatible mkpasswd implementation or an environment without yescrypt support is used, the resulting password hash variable can be empty and the build proceeds. The resulting image can therefore contain empty password fields for the root and alpha accounts, potentially permitting passwordless authentication depending on the authentication configuration.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 17:59 UTC
CWE
  • CWE-636 - Not Failing Securely (Failing Open)
  • CWE-252 - Unchecked Return Value
Impacted products
Vendor Product Version
chewkeanho software-actualizer Affected: 0 , ≤ 1.2.0 (semver)
Create a notification for this product.
Show details on NVD website

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CVE-2026-82744 (GCVE-0-2026-82744)

Vulnerability from cvelistv5 – Published: 2026-09-01 03:39 – Updated: 2026-09-01 15:15
VLAI
Title
Ash.Reactor change step fails open, skipping a change when its where guard raises
Summary
Not Failing Securely (Failing Open) vulnerability in ash-project ash skips an Ash.Reactor change when the guard controlling it raises, so a change meant to run does not. An Ash.Reactor change step can be gated by where validations that decide whether the change runs. Ash.Reactor.ChangeStep (lib/ash/reactor/steps/change_step.ex) evaluated those guards in apply_where_clauses/3, and apply_validation rescued any exception into {:error, error}. The reduce treated that identically to a guard whose condition was simply not met and bypassed the change. So when a guard raises (for example on attacker-influenced input), a change that enforces a security-relevant modification is skipped rather than failing the step. The fix distinguishes a raised exception (now {:raised, error}) and halts the step with an error, failing closed. This issue affects ash: from 3.0.0-rc.17 before 3.32.2.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-01 15:15 UTC
CWE
  • CWE-636 - Not Failing Securely ('Failing Open')
Assigner
Impacted products
Vendor Product Version
ash-project ash Affected: 3.0.0-rc.17 , < 3.32.2 (semver)
    cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*
Create a notification for this product.
ash-project ash Affected: 321f43bd05ad9544e693cbf797243693e51a6be4 , < 6d2eb86ea8d2ba5ffac89c1b8b9bf46e331feabc (git)
    cpe:2.3:a:ash-project:ash:*:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website

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CVE-2026-82018 (GCVE-0-2026-82018)

Vulnerability from cvelistv5 – Published: 2026-08-28 21:11 – Updated: 2026-09-02 18:46
VLAI
Title
IGEL OS 12 / 11 Secure Boot Bypass via Unsigned igel.conf File
Summary
IGEL OS 12 before 12.9.0, 12.8.3 LTS and IGEL OS 11 before 11.11.150 contain a secure boot bypass vulnerability in the GRUB boot stage that allows physically present attackers to gain unauthorized root access by placing an unsigned empty file named igel.conf on a partition. Attackers can exploit GRUB's fail-open signature verification behavior to drop into an interactive GRUB prompt, then boot the device's own kernel with additional command-line arguments to obtain a root shell with the disk unlocked while leaving TPM PCR values unaltered.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 18:46 UTC
CWE
  • CWE-636 - Not Failing Securely ('Failing Open')
Impacted products
Vendor Product Version
IGEL IGEL OS 12 Affected: 12.0.0 , ≤ 12.8.2 (semver)
Unaffected: 12.8.3 (semver)
Unaffected: 12.9.0 (semver)
Create a notification for this product.
IGEL IGEL OS 11 Affected: 11.0.0 , < 11.11.150 (semver)
Create a notification for this product.
Date Public
2026-06-17 00:00
Show details on NVD website

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CVE-2026-81379 (GCVE-0-2026-81379)

Vulnerability from cvelistv5 – Published: 2026-09-08 17:13 – Updated: 2026-09-11 22:12
VLAI
Title
Visual Studio Code Security Feature Bypass Vulnerability
Summary
Not failing securely ('failing open') in Visual Studio Code allows an unauthorized attacker to bypass a security feature over a network.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-10 14:32 UTC
CWE
  • CWE-636 - Not Failing Securely ('Failing Open')
References
Impacted products
Vendor Product Version
Microsoft Visual Studio Code Affected: 1.0.0 , < 1.136.2 (custom)
    cpe:2.3:a:microsoft:visual_studio_code:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-09-08 14:00
Show details on NVD website

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CVE-2026-73421 (GCVE-0-2026-73421)

Vulnerability from cvelistv5 – Published: 2026-08-13 22:04 – Updated: 2026-08-18 01:45
VLAI
Title
NextAuth.js: Configuration errors can cause existence-based auth checks to fail open (auth object populated with an error)
Summary
NextAuth.js provides authentication for Next.js. From next-auth 5.0.0-beta.0 until 5.0.0-beta.32, applications that gate access by checking only for the existence of the auth object returned by the auth() wrapper can fail open when Auth.js has a server configuration error. In middleware, Route Handlers, React Server Components, and other auth() entry points, a non-OK session response is parsed into a truthy error object instead of null, so checks such as !!auth and if (req.auth) evaluate to true for unauthenticated requests. A provider missing both the issuer and authorization endpoint triggers InvalidEndpoints, and an unset AUTH_SECRET or another server configuration error can produce the same behavior. There is no impact while configuration is valid, but after a deployment becomes misconfigured, routes protected only by session existence silently grant access to every visitor. This issue is fixed in next-auth 5.0.0-beta.32.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-18 01:45 UTC
CWE
  • CWE-285 - Improper Authorization
  • CWE-636 - Not Failing Securely ('Failing Open')
Impacted products
Vendor Product Version
nextauthjs next-auth Affected: >= 5.0.0-beta.4, < 5.0.0-beta.32
Create a notification for this product.
Show details on NVD website

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CVE-2026-70452 (GCVE-0-2026-70452)

Vulnerability from cvelistv5 – Published: 2026-08-13 14:46 – Updated: 2026-08-14 16:51
VLAI
Title
rsync 3.1.0 < 3.5.0 Access Control Bypass via DNS Resolution Failure
Summary
rsync 3.1.0 before 3.5.0 contains an access control bypass vulnerability that allows remote attackers to circumvent hosts deny rules by inducing DNS resolution failures during hostname-based access control evaluation. When a DNS lookup for a hostname-based deny rule fails, the daemon skips the rule rather than defaulting to a deny decision, enabling attackers who can trigger DNS failures to bypass module-level IP access controls and gain unauthorized access to restricted module file trees.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-14 15:46 UTC
CWE
  • CWE-863 - Incorrect Authorization
  • CWE-636 - Not Failing Securely ('Failing Open')
Impacted products
Vendor Product Version
RsyncProject rsync Affected: 3.1.0 , ≤ 3.4.4 (semver)
Unaffected: 3.5.0 (semver)
    cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-12 00:00
Credits
Show details on NVD website

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CVE-2026-69306 (GCVE-0-2026-69306)

Vulnerability from cvelistv5 – Published: 2026-08-11 17:05 – Updated: 2026-09-11 16:47
VLAI
Title
Visual Studio Code Security Feature Bypass Vulnerability
Summary
Not failing securely ('failing open') in Visual Studio Code allows an unauthorized attacker to bypass a security feature over a network.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-11 19:25 UTC
CWE
  • CWE-636 - Not Failing Securely ('Failing Open')
References
Impacted products
Vendor Product Version
Microsoft Visual Studio Code Affected: 1.0.0 , < 1.135 (custom)
    cpe:2.3:a:microsoft:visual_studio_code:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-11 14:00
Show details on NVD website

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CVE-2026-68746 (GCVE-0-2026-68746)

Vulnerability from cvelistv5 – Published: 2026-08-05 19:43 – Updated: 2026-08-06 14:48
VLAI
Title
Livebook Teams identity check fails open when the deployment group is unresolvable, allowing unauthenticated access
Summary
Not Failing Securely ('Failing Open') vulnerability in livebook-dev livebook allows an unauthenticated network client to obtain full access to a Livebook server that enforces identity through Livebook Teams. A Livebook Agent or App Server connected to Livebook Teams caches the identifier of the deployment group it belongs to, and resolves that identifier against a locally cached list of deployment groups on every request in order to decide whether Teams identity enforcement is active. Livebook.Hubs.TeamClient.handle_call/3 in lib/livebook/hubs/team_client.ex does not distinguish a deployment group that could not be resolved from one that was resolved with identity enforcement switched off: the clause matches only the case where a group was found with enforcement enabled, and falls through to a catch-all that reports enforcement as switched off for everything else. The two neighbouring functions that decide user and application access resolve the same identifier and treat the same unresolved result as a denial. When the identity status is reported as switched off, Livebook.ZTA.LivebookTeams.authenticate/3 in lib/livebook/zta/livebook_teams.ex returns empty identity metadata and allows the request to continue instead of halting it. LivebookWeb.UserPlug.build_current_user/3 merges that empty metadata into a newly built user, whose access type defaults to full access, and LivebookWeb.AuthPlug.authorized?/1 grants access to any user holding full access. The cached identifier becomes unresolvable when the deployment group it refers to is deleted while the agent is not connected to receive the change, most concretely when a deployment group is deleted during the window in which an agent is disconnected or reconnecting. The client removes the group from its cached list without clearing the identifier that refers to it. Any client able to reach the affected server over the network is then granted the same access as a fully privileged member of the organisation, including the ability to read notebooks and configured secrets, execute code on the server's runtime, and disrupt its operation. This issue affects livebook: from 0.19.7 before 0.19.9.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 14:45 UTC
CWE
  • CWE-636 - Not Failing Securely ('Failing Open')
Assigner
Impacted products
Vendor Product Version
livebook-dev livebook Affected: 0.19.7 , < 0.19.9 (semver)
    cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*
Create a notification for this product.
livebook-dev livebook Affected: 0.19.7 , < 0.19.9 (other)
Affected: 0.19.7-cuda12 , < 0.19.9-cuda12 (other)
    cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*
Create a notification for this product.
livebook-dev livebook Affected: fc2c87c6b0276705281842acbe17142d1ac4d555 , < * (git)
    cpe:2.3:a:livebook-dev:livebook:*:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website

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              "value": "\u003cp\u003eNot Failing Securely (\u0027Failing Open\u0027) vulnerability in livebook-dev livebook allows an unauthenticated network client to obtain full access to a Livebook server that enforces identity through Livebook Teams.\u003c/p\u003e\n\u003cp\u003eA Livebook Agent or App Server connected to Livebook Teams caches the identifier of the deployment group it belongs to, and resolves that identifier against a locally cached list of deployment groups on every request in order to decide whether Teams identity enforcement is active. \u003ccode\u003eLivebook.Hubs.TeamClient.handle_call/3\u003c/code\u003e in \u003ccode\u003elib/livebook/hubs/team_client.ex\u003c/code\u003e does not distinguish a deployment group that could not be resolved from one that was resolved with identity enforcement switched off: the clause matches only the case where a group was found with enforcement enabled, and falls through to a catch-all that reports enforcement as switched off for everything else. The two neighbouring functions that decide user and application access resolve the same identifier and treat the same unresolved result as a denial.\u003c/p\u003e\n\u003cp\u003eWhen the identity status is reported as switched off, \u003ccode\u003eLivebook.ZTA.LivebookTeams.authenticate/3\u003c/code\u003e in \u003ccode\u003elib/livebook/zta/livebook_teams.ex\u003c/code\u003e returns empty identity metadata and allows the request to continue instead of halting it. \u003ccode\u003eLivebookWeb.UserPlug.build_current_user/3\u003c/code\u003e merges that empty metadata into a newly built user, whose access type defaults to full access, and \u003ccode\u003eLivebookWeb.AuthPlug.authorized?/1\u003c/code\u003e grants access to any user holding full access.\u003c/p\u003e\n\u003cp\u003eThe cached identifier becomes unresolvable when the deployment group it refers to is deleted while the agent is not connected to receive the change, most concretely when a deployment group is deleted during the window in which an agent is disconnected or reconnecting. The client removes the group from its cached list without clearing the identifier that refers to it. Any client able to reach the affected server over the network is then granted the same access as a fully privileged member of the organisation, including the ability to read notebooks and configured secrets, execute code on the server\u0027s runtime, and disrupt its operation.\u003c/p\u003e\n\u003cp\u003eThis issue affects livebook: from 0.19.7 before 0.19.9.\u003c/p\u003e"
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              "value": "Not Failing Securely (\u0027Failing Open\u0027) vulnerability in livebook-dev livebook allows an unauthenticated network client to obtain full access to a Livebook server that enforces identity through Livebook Teams.\n\nA Livebook Agent or App Server connected to Livebook Teams caches the identifier of the deployment group it belongs to, and resolves that identifier against a locally cached list of deployment groups on every request in order to decide whether Teams identity enforcement is active. `Livebook.Hubs.TeamClient.handle_call/3` in `lib/livebook/hubs/team_client.ex` does not distinguish a deployment group that could not be resolved from one that was resolved with identity enforcement switched off: the clause matches only the case where a group was found with enforcement enabled, and falls through to a catch-all that reports enforcement as switched off for everything else. The two neighbouring functions that decide user and application access resolve the same identifier and treat the same unresolved result as a denial.\n\nWhen the identity status is reported as switched off, `Livebook.ZTA.LivebookTeams.authenticate/3` in `lib/livebook/zta/livebook_teams.ex` returns empty identity metadata and allows the request to continue instead of halting it. `LivebookWeb.UserPlug.build_current_user/3` merges that empty metadata into a newly built user, whose access type defaults to full access, and `LivebookWeb.AuthPlug.authorized?/1` grants access to any user holding full access.\n\nThe cached identifier becomes unresolvable when the deployment group it refers to is deleted while the agent is not connected to receive the change, most concretely when a deployment group is deleted during the window in which an agent is disconnected or reconnecting. The client removes the group from its cached list without clearing the identifier that refers to it. Any client able to reach the affected server over the network is then granted the same access as a fully privileged member of the organisation, including the ability to read notebooks and configured secrets, execute code on the server\u0027s runtime, and disrupt its operation.\n\nThis issue affects livebook: from 0.19.7 before 0.19.9."
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          "value": "Not Failing Securely (\u0027Failing Open\u0027) vulnerability in livebook-dev livebook allows an unauthenticated network client to obtain full access to a Livebook server that enforces identity through Livebook Teams.\n\nA Livebook Agent or App Server connected to Livebook Teams caches the identifier of the deployment group it belongs to, and resolves that identifier against a locally cached list of deployment groups on every request in order to decide whether Teams identity enforcement is active. Livebook.Hubs.TeamClient.handle_call/3 in lib/livebook/hubs/team_client.ex does not distinguish a deployment group that could not be resolved from one that was resolved with identity enforcement switched off: the clause matches only the case where a group was found with enforcement enabled, and falls through to a catch-all that reports enforcement as switched off for everything else. The two neighbouring functions that decide user and application access resolve the same identifier and treat the same unresolved result as a denial.\n\nWhen the identity status is reported as switched off, Livebook.ZTA.LivebookTeams.authenticate/3 in lib/livebook/zta/livebook_teams.ex returns empty identity metadata and allows the request to continue instead of halting it. LivebookWeb.UserPlug.build_current_user/3 merges that empty metadata into a newly built user, whose access type defaults to full access, and LivebookWeb.AuthPlug.authorized?/1 grants access to any user holding full access.\n\nThe cached identifier becomes unresolvable when the deployment group it refers to is deleted while the agent is not connected to receive the change, most concretely when a deployment group is deleted during the window in which an agent is disconnected or reconnecting. The client removes the group from its cached list without clearing the identifier that refers to it. Any client able to reach the affected server over the network is then granted the same access as a fully privileged member of the organisation, including the ability to read notebooks and configured secrets, execute code on the server\u0027s runtime, and disrupt its operation.\n\nThis issue affects livebook: from 0.19.7 before 0.19.9."
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CVE-2026-62235 (GCVE-0-2026-62235)

Vulnerability from cvelistv5 – Published: 2026-07-17 00:07 – Updated: 2026-07-17 12:06 X_Open Source
VLAI
Title
Grav Flex-Objects < 1.4.3 Authorization Bypass via API
Summary
Grav Flex-Objects before version 1.4.3 contains a broken access control vulnerability in the admin-next REST API that allows authenticated users with only api.access permission to perform unauthorized CRUD operations on permission-less directories. Attackers with api.access credentials can create, read, update, delete, and export objects from any directory lacking an explicit permissions configuration, bypassing intended authorization controls.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 12:06 UTC
CWE
  • CWE-862 - Missing Authorization
  • CWE-636 - Not Failing Securely ('Failing Open')
References
Impacted products
Vendor Product Version
getgrav grav Affected: 0 , < 1.4.3 (semver)
Unaffected: 1.4.3 (semver)
    cpe:2.3:a:getgrav:grav:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-06-29 00:00
Show details on NVD website

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Mitigation
Architecture and Design

Subdivide and allocate resources and components so that a failure in one part does not affect the entire product.

No CAPEC attack patterns related to this CWE.