Weakness (CWE)
CWE-636: Not Failing Securely
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.
How to prevent it (1 mitigation)
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Architecture and Design
Subdivide and allocate resources and components so that a failure in one part does not affect the entire product.
Source: MITRE CWE-636
84 results · Feed
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High 8.1
Directus before 12.1.0 Authorization Bypass via Public WebSocket REST Interface
Directus before 12.1.0 contains an authorization bypass vulnerability that allows unauthenticated attackers to skip permission checks by sending a failed auth message on public-mode WebSocket connections. Attackers can send an invalid token so handleAuthReque…
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Medium 6.8
.NET Security Feature Bypass Vulnerability
Not failing securely ('failing open') in .NET allows an unauthorized attacker to bypass a security feature over a network.
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High 7.4
vault-java-driver: SslConfig silently disables requested TLS verification
vault-java-driver, a Java client for HashiCorp Vault, silently disables TLS certificate and hostname verification in three states where the caller asked for verification: an SslConfig passed to VaultConfig without calling build(), an SslConfig restored by Jav…
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Medium 6.9
Sandboxie-Plus: Sandbox containment bypass
Sandboxie-Plus is an open source sandbox-based isolation software for Windows. Prior to 1.18.6, a process inside a sandbox could send MSGID_FILE_SET_ATTRIBUTES or MSGID_FILE_SET_SHORT_NAME to SbieSvc and cause the SYSTEM service to open and modify an existing…
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Critical 9.1
node-opcua: Namespace-Level RBAC Fail-Open - Anonymous Write/Call Bypass via Unbound `DefaultRolePermissions
node-opcua is an OPC UA implementation for TypeScript and Node.js. From 2.42.0 until 2.180.0, namespace-level access control configured through setDefaultRolePermissions is not honored by the runtime enforcement path for nodes without explicit per-node RolePe…
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Critical 9.1
An unauthenticated attacker with network access to the SonicWall GMS 9.5.2 and earlier versions may be able to read int…
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Critical 9.1
Apache Kafka: Broker silently skips JWT signature verification for SASL/OAUTHBEARER when the JWKS endpoint URL is not configured
A Kafka broker using SASL/OAUTHBEARER with the default validator (sasl.oauthbearer.jwt.validator.class=DefaultJwtValidator) selects its implementation from configuration. When sasl.oauthbearer.jwks.endpoint.url is set, the validator verifies the JWT signature…
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Critical 9.1
A vulnerability allowing an unauthenticated attacker to bypass authorization on the CDP Coordinator Service.
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Low 2.3
Apache Pulsar: Namespace encryption requirement not enforced after a failure during topic initialization
Apache Pulsar allows an administrator to require end-to-end message encryption for all topics in a namespace by setting the encryption_required namespace policy. When this policy is set, the broker rejects messages that are published without encryption. When …
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Medium 5.8
Not Failing Securely ('Failing Open') in hMailServer
Not failing securely in the anti-virus attachment-stripping action of Progressive Robot hMailServer 6.0.0 through 6.3.6 allows a remote unauthenticated attacker to have a message that the server's virus scanner found infected delivered to the recipient's mail…
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Medium 6.5
Apache Tomcat: OpenSSL-FFM FIPS failure does not prevent start-up
Not Failing Securely ('Failing Open') vulnerability in Apache Tomcat. If the OpenSSLLifecycleListener is configured to use FIPS mode but FIPS activation fails, Tomcat logs and error but continues to use JSSE in non-FIPS mode with the provided configuration. T…
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Medium 5.9
hex_core's default HTTP adapter doesn't verify TLS certificates on OTP 24 and 25
Improper Certificate Validation vulnerability in hexpm hex_core allows an attacker who can intercept HTTPS connections to impersonate hex.pm, repo.hex.pm or any other repository or API server to programs that use hex_core's default HTTP adapter on Erlang/OTP …
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Medium 6.8
Dell Secure Connect Gateway (SCG) Policy Manager, versions prior to 5.34.00.16, contains a Not Failing Securely ('Faili…
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Medium 5.4
SumatraPDF: `sumatrapdfrestrict.ini` never revokes any permission (fail-open policy initialization)
SumatraPDF is a multi-format reader for Windows. In 3.6.1 and earlier, InitializePolicies() starts the sumatrapdfrestrict.ini path with gPolicyRestrictions set to Perm::All and only ORs permission bits, so the INI file never revokes permissions. Deploying Sum…
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Medium 5.9
Fail-open response masking in Docker Sandboxes can expose proxy-managed credentials
Docker Sandboxes could fail open while masking credentials in protected proxy responses. When a response-body read returned data together with an error, affected handlers could forward unmasked bytes. Code inside an authorized sandbox could use this to recove…
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High 7.4
Not Failing Securely ('Failing Open') in hMailServer
Progressive Robot hMailServer 6.0.0 through 6.3.5 fails open when applying DANE (RFC 7672) to outbound SMTP delivery. The server's validating DNSSEC resolver treated a TLSA or MX lookup that did not complete (no answer, SERVFAIL, a malformed reply), an answer…
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Medium 5.9
pgjdbc does not enforce requireAuth when the value excludes every authentication method
pgjdbc, the PostgreSQL JDBC Driver, versions 42.7.11 through 42.7.13 enforce no restriction when the requireAuth connection property excludes all six authentication methods the driver knows, for example requireAuth=!password,!md5,!gss,!sspi,!scram-sha-256,!no…
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Critical 9.5
Authentication bypass via blank auth token in P4Search
P4 Search prior to 2026.4.2 does not fail securely when its service authentication token is blank. In affected configurations, an unauthenticated attacker with network access can obtain the highest application privilege, potentially leading to compromise of P…
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Medium 5.5
heym before 0.0.105 Authentication Bypass via Redis Node
heym before 0.0.105 does not act on the result of the credential authorization lookup in the Redis workflow node (backend/app/services/node_execution/nodes/redis_node.py). When _get_accessible_credential returns None — because the credential ID does not exist…
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Medium 5.3
TDuck survey form 6.0 Information Disclosure via Fail-Open Form Ownership Check
TDuck survey form 6.0 contains an information disclosure vulnerability in FormAuthUtils.hasPermission that fails open when a form does not exist, allowing authenticated users to access deleted form submissions. Attackers can read orphaned submission data incl…
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High 7.4
@bytebase/dbhub's read-only mode does not prevent database writes
DBHub is a database MCP server for Postgres, MySQL, SQL Server, Oracle, MariaDB, SQLite. Prior to version 0.22.6, setting `readonly = true` on the `execute_sql` tool does not make the connection read-only. The connectors are written to set PostgreSQL `default…
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Medium 5.3
Busybox: busybox: httpd silently fails open when ip deny rules contain invalid cidr prefix lengths
BusyBox httpd IP deny rules with invalid CIDR prefix lengths fail open, leaving a parsed IP with a zeroed mask so the rule matches no clients.
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Critical 9.3
Moquette fails open when configured authentication or authorization classes cannot load
Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, when a configured authenticator or authorizator class cannot be loaded, Server.initializeAuthenticator and Server.initializeAuthorizatorPolicy treat the failure as though no custom class was configu…
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High 7.4
AuthPoint Gateway Improper Authentication in LDAP Sync Allows First-Factor Authentication Bypass
A missing/improper authentication vulnerability in the WatchGuard AuthPoint Gateway's LDAP Sync first-factor authentication allows a remote attacker to bypass single-factor password verification under non-default operating conditions. Additional authenticatio…
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High 8.1
Tinyauth: forward-auth per-app ACL is matched case-sensitively against the (case-insensitive) hostname, letting an authenticated user reach apps they are not on the allowlist for
Tinyauth is an authentication and authorization server. Prior to 5.1.2, Tinyauth compares forwarded hostnames case-sensitively while reverse proxies route equivalent hostnames case-insensitively, allowing an authenticated low-privilege user to bypass per-app …
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Medium 5.9
Craft CMS 5.0.0 before 5.10.13 Environment Secret Exposure via Installer
Craft CMS 5.0.0 through 5.10.12 treats a database connection failure as meaning that Craft is not installed, which makes anonymous installer actions — including install/validate-site — reachable on an installed production site whenever PHP remains available b…
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High 7.7
djust: Multi-tenant isolation fails open on the WebSocket/SSE path, disclosing other tenants' data
djust provides Phoenix LiveView-style reactive server-side rendering for Django with Rust-powered performance. Prior to version 1.0.7, `djust.tenants` isolation was enforced only on the HTTP path. The current tenant was stored in `threading.local()` and set e…
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Critical 9.3
Bambuddy's authentication fails open on database errors, allowing unauthenticated access to all endpoints
Bambuddy is a self-hosted print archive and management system for Bambu Lab 3D printers. Starting in version 0.1.6 and prior to version 0.2.4.4, a fail-open in the authentication code allows any attacker to bypass authentication by flooding a public endpoint …
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Critical 9.0
SSRF protection bypass in safeurl via IPv6 addresses and unresolvable hosts
Server-Side Request Forgery (SSRF) vulnerability in Slab safeurl allows an attacker who controls a validated URL to reach internal network destinations the library is configured to block. Only IPv4 addresses are matched against the reserved ranges and the blo…
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High 8.2
Visual Studio Code Security Feature Bypass Vulnerability
Not failing securely ('failing open') in Visual Studio Code allows an unauthorized attacker to bypass a security feature over a network.
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Medium 4.3
APITable through 1.13.0-beta.1 Fail-Open Authorization in the Fusion API Node Permission Guard
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 p…
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High 7.9CVE-2026-85649 Public exploit
(Holloway) Chew, Kean Ho's Actualizer v1.2.0 and earlier contains a fail-open password validation vulnerability in the …
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High 8.2
NGINX ngx_http_js_module vulnerability
Description NGINX JavaScript (njs) and QuickJS (qjs) engines have a vulnerability when a js_access handler performs asynchronous request body processing and an exception is thrown during asynchronous access-control evaluation before an explicit access denial …
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Low 2.1
Ash.Reactor change step fails open, skipping a change when its where guard raises
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 chan…
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Medium 6.1
IGEL OS 12 / 11 Secure Boot Bypass via Unsigned igel.conf File
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 …
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Medium —
AIIR verification and policy gates could report success without enforcing the control (fail-open)
### Summary Several of AIIR's verification and policy paths could return a success/"verified" result without actually enforcing the control they represent — they could **fail open** rather than fail closed. For a tool whose purpose is trustworthy verification…
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Medium 5.3
MyBB: Security Question insufficient validation
### Impact The registration component does not validate the text-based _Security Question_ CAPTCHA correctly, allowing attackers to bypass the challenge via a specially crafted value. [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N](https://www.first.org/cvss/c…
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Critical 9.1
NextAuth.js: Configuration errors can cause existence-based auth checks to fail open (auth object populated with an error)
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 config…
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High 7.4
rsync 3.1.0 < 3.5.0 Access Control Bypass via DNS Resolution Failure
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 de…
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High 7.5
JupyterLab before 4.6.2 Authentication Bypass via PyPIExtensionManager
JupyterLab versions >=4.6.0,<=4.6.1 and <=4.5.9 contain an allowlist/blocklist enforcement gap in PyPIExtensionManager.install(). A missing 'await' caused the is_install_allowed coroutine to never execute, so the extension allowlist/blocklist check was not en…