Weakness (CWE)
CWE-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
If a web server does not fully parse requested URLs before it examines them for authorization, it may be possible for an attacker to bypass authorization protection.
More detail
For instance, the character strings /./ and / both mean current directory. If /SomeDirectory is a protected directory and an attacker requests /./SomeDirectory, the attacker may be able to gain access to the resource if /./ is not converted to / before the authorization check is performed.
How to prevent it (1 mitigation)
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Architecture and Design
URL Inputs should be decoded and canonicalized to the application's current internal representation before being validated and processed for authorization. Make sure that your application does not decode the same input twice. Such errors could be used to bypass allowlist schemes by introducing dangerous inputs after they have been checked.
Source: MITRE CWE-551
29 results · Feed
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Medium 6.2
ImageMagick: Policy Bypass when using coder as the domain.
ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to 7.1.2-31 and 6.9.13-56, a crafted image can bypass an ImageMagick security policy that uses coder as its domain, potentially allowing data prohibited by th…
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High 7.5
Quarkus-vertx-http: authorization bypass via path normalization discrepancy in quarkus http security
A flaw was found in Quarkus HTTP security. An unauthenticated attacker can exploit a discrepancy in how paths are normalized between the security matcher and HTTP request dispatchers. This allows the attacker to craft a URL that the security matcher considers…
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High 7.7
Stolostron/multicluster-observability-addon: cross-namespace secret disclosure in multicluster-observability-addon via unvalidated configuration references
A cross-namespace authorization flaw in multicluster-observability-addon allows a user with permission to modify a managed cluster’s ManagedClusterAddOn configuration to reference ClusterLogForwarder or OpenTelemetryCollector resources outside the permitted n…
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High 8.1
Keycloak-services: keycloak-services: default dcr policy allows role forgery via user property mappers
A flaw was found in the Dynamic Client Registration (DCR) component of Keycloak, an identity and access management solution. The default DCR policy fails to properly validate the claim path for User Property mappers, allowing them to write values to sensitive…
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High 8.1
Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching in pathmatcher
A flaw was found in Keycloak's Authorization Services. The component responsible for matching request paths to security policies (PathMatcher) does not properly normalize URIs before comparison. By adding extra characters like a trailing slash or matrix param…
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High 7.5
fast-uri vulnerable to host confusion via failed IDN canonicalization
fast-uri versions 2.3.1 through 3.1.2 and 4.0.0 fail to canonicalize Unicode (IDN) hostnames for HTTP-family URLs. The IDN conversion path calls a helper that does not exist on the global URL constructor, silently leaving the host in its original Unicode form…
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High 7.7
Peplink InControl 2 through 2.14.2 before 2026-06-03 allows use of a semicolon to bypass access-control rules for certa…
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High 7.5
Authentication/Authorization Bypass via Advanced Path Normalization Vulnerabilities
Quarkus is a Java framework for building cloud-native applications. Prior to versions 3.37.0, 3.36.3, 3.33.2.1, 3.33.3, 3.27.4.1, 3.27.5, and 3.20.6.2, Quarkus HTTP path-based authorization policies can be bypassed using encoded semicolons (%3B) to smuggle ma…
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High 8.8
All V1 collection-level endpoints in ChromaDB's Python project pass None for the tenant and database to the authorizati…
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High 8.1
Next.js: Middleware / Proxy bypass through dynamic route parameter injection
Next.js is a React framework for building full-stack web applications. From 15.4.0 to before 15.5.16 and 16.2.5, applications that rely on middleware to protect dynamic routes can be vulnerable to authorization bypass. In affected deployments, specially craft…
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High 7.5
Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes
Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.16 and 16.2.5, App Router applications that rely on middleware or proxy-based checks for authorization can allow unauthorized access through transport-specific r…
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High 7.5
Next.js: Middleware / Proxy bypass in Pages Router applications using i18n
Next.js is a React framework for building full-stack web applications. From 12.2.0 to before 15.5.16 and 16.2.5, Applications using the Pages Router with i18n configured and middleware/proxy-based authorization can allow unauthorized access to protected page …
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High 8.8
Quarkus authorization bypass via semicolon path normalization inconsistency
Quarkus is a Java framework for building cloud-native applications. In versions prior to 3.20.6.1, 3.27.3.1, 3.33.1.1, 3.35.1.1, 3.34.7, and 3.35.2, a path normalization inconsistency between the security layer and the routing layer allows unauthenticated or …
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High 8.2CVE-2026-40022 Public exploit
Apache Camel Platform HTTP Main: Authentication Bypass on Non-Root Context Paths in camel main runtime
When authentication is enabled on the Apache Camel embedded HTTP server or embedded management server (camel-platform-http-main) and a non-root context path such as /api or /admin is configured via camel.server.path or camel.management.path, the BasicAuthenti…
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High 7.5
ervlet Path Not Correctly Included in Path Matching of XML Authorization Rules
Vulnerability in Spring Spring Security. If an application uses <sec:intercept-url servlet-path="/servlet-path" pattern="/endpoint/**"/> to define the servlet path for computing a path matcher, then the servlet path is not included and the related authorizati…
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High 8.3
ScriptAlias CGI targets bypass directory auth in inets httpd (mod_auth vs mod_cgi path mismatch)
Incorrect Authorization vulnerability in Erlang OTP (inets modules) allows unauthenticated access to CGI scripts protected by directory rules when served via script_alias. When script_alias maps a URL prefix to a directory outside DocumentRoot, mod_auth evalu…
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High 8.1
Keycloak: keycloak: uma policy bypass allows authenticated users to gain unauthorized access to victim-owned resources.
A flaw was found in Keycloak. An authenticated user with the uma_protection role can bypass User-Managed Access (UMA) policy validation. This allows the attacker to include resource identifiers owned by other users in a policy creation request, even if the UR…
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Critical 9.1CVE-2026-33186 Public exploit
gRPC-Go has an authorization bypass via missing leading slash in :path
gRPC-Go is the Go language implementation of gRPC. Versions prior to 1.79.3 have an authorization bypass resulting from improper input validation of the HTTP/2 `:path` pseudo-header. The gRPC-Go server was too lenient in its routing logic, accepting requests …
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Critical 9.8
ZKTeco ZKBioSecurity 3.0 User Enumeration via authLoginAction
ZKTeco ZKBioSecurity 3.0 contains a user enumeration vulnerability that allows unauthenticated attackers to discover valid usernames by submitting partial characters via the username parameter. Attackers can send requests to the authLoginAction!login.do scrip…
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High 8.2
NestJS 11.1.13 - Lack of data validation allowing authentication/authorization bypass
A NestJS application using @nestjs/platform-fastify can allow bypass of authentication/authorization middleware when Fastify path-normalization options are enabled. This issue affects nest.Js: 11.1.13.
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Medium 5.3
Keycloak: keycloak authorization header parsing leading to potential security control bypass
A flaw was found in Keycloak. The Keycloak Authorization header parser is overly permissive regarding the formatting of the "Bearer" authentication scheme. It accepts non-standard characters (such as tabs) as separators and tolerates case variations that devi…
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High 7.4
Quarkus: graphql operations over websockets bypass
A flaw was found in Quarkus. This issue occurs when receiving a request over websocket with no role-based permission specified on the GraphQL operation, Quarkus processes the request without authentication despite the endpoint being secured. This can allow an…
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Critical 10.0CVE-2023-23924 Public exploit
URI validation failure on SVG parsing in Dompdf
Dompdf is an HTML to PDF converter. The URI validation on dompdf 2.0.1 can be bypassed on SVG parsing by passing `<image>` tags with uppercase letters. This may lead to arbitrary object unserialize on PHP < 8, through the `phar` URL wrapper. An attacker can e…
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High 7.2
Junos OS: SRX Series: Under a specific device configuration an attacker can access the devices J-Web management services from any interface, regardless of security settings protecting the service
Due to a Missing Authorization weakness and Insufficient Granularity of Access Control in a specific device configuration, a vulnerability exists in Juniper Networks Junos OS on SRX Series whereby an attacker who attempts to access J-Web administrative interf…
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High 8.6
Incorrectly handling of URI '#fragment' element as part of the path element
Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions envoy incorrectly handled a URI '#fragment' element as part of the path element. Envoy is configured with an RBAC filter for …
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High 8.6
Incorrect concatenation of multiple value request headers in ext-authz extension
Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions when ext-authz extension is sending request headers to the external authorization service it must merge multiple value header…
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Medium 5.3
Encoded URIs can access WEB-INF directory in Eclipse Jetty
For Eclipse Jetty versions 9.4.37-9.4.42, 10.0.1-10.0.5 & 11.0.1-11.0.5, URIs can be crafted using some encoded characters to access the content of the WEB-INF directory and/or bypass some security constraints. This is a variation of the vulnerability reporte…
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High 7.5
Jetty vulnerable to incorrect handling of invalid large TLS frame, exhausting CPU resources
In Eclipse Jetty 7.2.2 to 9.4.38, 10.0.0.alpha0 to 10.0.1, and 11.0.0.alpha0 to 11.0.1, CPU usage can reach 100% upon receiving a large invalid TLS frame.
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Medium 5.3
Authorization Before Parsing and Canonicalization in jetty
In Eclipse Jetty 9.4.37.v20210219 to 9.4.38.v20210224, the default compliance mode allows requests with URIs that contain %2e or %2e%2e segments to access protected resources within the WEB-INF directory. For example a request to /context/%2e/WEB-INF/web.xml …