Authentication Bypass by Spoofing
CWE-290
This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.
We track 334 vulnerabilities of this type. 100% are rated high or critical, and the average CVSS score is 8.5. 8 have been exploited in real attacks.
Latest Authentication Bypass by Spoofing vulnerabilities
- 9.1 Critical severity
symfony: Authentication Bypass by Spoofing
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, X509Authenticator extracts the user identifier from $_SERVER['SSL_CLIENT_S_DN'] with an unanchored regex that matches
- 8.1 High severity
symfony: Authentication Bypass by Spoofing
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 7.1.0 until 7.4.12 and 8.0.12, Cas2Handler builds the CAS service parameter from Request::getSchemeAndHttpHost(), which reflects an attacker-controlled Host
- 9.8 Critical severity
Webmail: Authentication Bypass by Spoofing
In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, the password plugin of the Roundcube Webmail was subject to username spoofing via session data, which could lead to account takeover.
- 9.1 Critical severity
ueberauth_apple: Authentication Bypass by Spoofing
Authentication Bypass by Spoofing vulnerability in ueberauth ueberauth_apple allows account takeover via unvalidated ID token claims. The Ueberauth.Strategy.Apple.Token.payload/2 function verifies the JWT signature of the callback id_token against Apple's JWKS
- 7.3 High severity
PraisonAI: Authentication Bypass by Spoofing
PraisonAI AgentMail versions before 4.6.78 lack signature verification in webhook mode, allowing unauthenticated attackers to inject messages with spoofed sender addresses. Attackers can POST crafted message.received events to the webhook endpoint to inject ar
- 8.3 High severity
9router: Improper Authentication
9Router is an AI router & token saver. Prior to 0.5.2, 9router treats loopback requests as trusted and allows /v1/* access without an API key, so a same-host reverse proxy that forwards public traffic to the backend through 127.0.0.1 causes src/dashboardGuard.
- 8.2 High severity
9router: Authentication Bypass by Spoofing
9Router is an AI router & token saver. Prior to 0.5.2, 9router determines whether a /v1 LLM proxy request is local by reading the client-controlled Host header, allowing a remote unauthenticated attacker to send Host: localhost and bypass API-key authenticatio
- 8.0 High severity
open-webui: Improper Authentication
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. Prior to 0.10.0, backend/open_webui/routers/terminals.py built the ws_terminal upstream URL from an unencoded session_id and appended user_id as a query parameter, allowing q
- 10.0 Critical severity
CoreWCF: Authentication Bypass by Spoofing
CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 and 1.9.1, CoreWCF SAML 1.1 and SAML 2.0 token validation does not correctly resolve the issuer signing key or require signed tokens when IdentityConfi
- 7.5 High severity
MOVEit Transfer: Authentication Bypass by Spoofing
Limited authentication bypass by spoofing vulnerability in Progress MOVEit Transfer (HTTPS module). This issue affects MOVEit Transfer: before 2025.0.7, from 2025.1.0 before 2025.1.3.
- 10.0 Critical severity
traefik: Improper Handling of Case Sensitivity
Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's BasicAuth, DigestAuth, and ForwardAuth middlewares strip canonical-cased spoofed identity headers before writing Traefik's own value, but do not account for u
- 9.1 Critical severity
Apache IoTDB: Authentication Bypass by Spoofing
Authentication Bypass by Spoofing vulnerability in Apache IoTDB. Certain Thrift RPC query handlers lack strict validation of the sessionId parameter. An attacker can construct requests with a forged sessionId and, without performing openSession authentication,
- 7.5 High severity
NodeBB: Authentication Bypass by Spoofing
NodeBB does not bind the claimed author of an inbound ActivityPub object to the authenticated remote actor. The inbound middleware verifies the HTTP-signature actor and checks the origin of object.id, but never validates that attributedTo corresponds to the se
- 9.8 Critical severity
AIStore framework: Authentication Bypass by Spoofing
NVIDIA AIStore framework contains a vulnerability where an attacker could bypass authentication. A successful exploit of this vulnerability might lead to denial of service, escalation of privileges, information disclosure, and data tampering.
- 7.5 High severity
FUXA SCADA/HMI: Authentication Bypass by Spoofing
FUXA versions 1.3.1 and prior contain an authentication bypass vulnerability via dot-segment path normalization in the REST API. The API router fails to normalize dot-segment sequences before applying authentication middleware, allowing unauthenticated request
- 8.1 High severity
woodpecker: Authentication Bypass by Spoofing
Woodpecker before 3.15.0 matches the ApprovalAllowedUsers bypass list against pipeline.Author. For the GitLab forge driver, pipeline.Author is populated from the git commit author name (commit.author.name) carried in the webhook payload, which is attacker-cont
- 9.1 Critical severity
filebrowser: Improper Authentication
File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Starting with 2.0.0-rc.1, when FileBrowser is configured with proxy authentication (auth.method=proxy), any unauthenticated
- 7.7 High severity
gogs: Authentication Bypass by Spoofing
Gogs is an open source self-hosted Git service. Prior to 0.14.3, when ENABLE_REVERSE_PROXY_AUTHENTICATION is enabled, Gogs accepts the configured authentication header (default: X-WEBAUTH-USER) directly from client requests without validating that the request
- 8.1 High severity
caddy: Improper Authentication
Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, forward_auth copy_headers deletes the exact client-supplied identity header before copying the trusted value from the auth gateway. But when the request later goes through php_fa
- 7.2 High severity
n8n: Authentication Bypass by Spoofing
n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, the MicrosoftAgent365Trigger and StripeTrigger node did not validate that inbound requests. As a result, an unauthenticated attacker who knows the webhook URL could submit a forged
- 9.8 Critical severity
litellm: Authentication Bypass by Spoofing
LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, a Host-header parsing flaw in the LiteLLM proxy could, under specific conditions, allow unauthenticated access to protected management routes. The auth layer
- 9.1 Critical severity
Apache APISIX: Authentication Bypass by Spoofing
Authentication Bypass by Spoofing vulnerability in Apache APISIX. The attacker can completely bypass authentication capitalising on certain configurations of jwt-auth plugin. This issue affects Apache APISIX: from v2.2 through v3.16.0. Users are recommended to
- 8.1 High severity
Webmin: Authentication Bypass by Spoofing
The Webmin HTTP server (miniserv.pl) allows unauthenticated attackers to impersonate any user with a configured SSL client certificate by sending a forged HTTP header. A remote attacker can spoof certificate DNs and authenticate as any user. Fixed in 2.202.
- 7.1 High severity
woodpecker: Authentication Bypass by Spoofing
Woodpecker is a CI/CD engine. Starting in version 3.0.0 and prior to version 3.14.1, a vulnerability in Woodpecker CI's gRPC layer allowed any authenticated agent to impersonate any other agent on the same server by injecting a forged `agent_id` value into out
- 8.2 High severity
tinyproxy: Authentication Bypass by Spoofing
Tinyproxy through 1.11.3, fixed in commit 09312a1, fails to properly validate the Host header during stathost detection, allowing unauthenticated attackers to access the stats page by injecting a matching Host header or bypass detection via port manipulation.
- 8.1 High severity
OpenClaw: Authentication Bypass by Spoofing
OpenClaw before 2026.5.3 contains a policy enforcement vulnerability where Zalo contacts with mutable display metadata could match allowFrom policy entries through display name changes. Attackers with mutable display names could receive agent responses intende
- 8.1 High severity
OpenClaw: Authentication Bypass by Spoofing
OpenClaw before 2026.5.7 contains a privilege escalation vulnerability where the allowFrom feature improperly validates Discord account identity using mutable display names instead of immutable user IDs. Attackers with Discord accounts can change their display
- 9.2 Critical severity
ash_authentication: Authentication Bypass by Spoofing
Authentication Bypass by Spoofing vulnerability in team-alembic AshAuthentication allows account takeover of local users via OAuth2/OIDC sign-in. AshAuthentication's OAuth2 and OIDC family strategies matched the local user by email address (an upsert on the em
- 7.1 High severity
OpenClaw: Authentication Bypass by Spoofing
OpenClaw before 2026.5.18 contains an identity header validation vulnerability allowing local same-host callers to forge trusted-proxy identity headers. Attackers with access to the proxy-facing Gateway port can supply forged identity headers to assume operato
- 8.1 High severity
OpenClaw: Authentication Bypass by Spoofing
OpenClaw before 2026.5.3 contains a privilege escalation vulnerability in the allowFrom feature that binds to mutable Slack display names. Attackers with Slack account access can change display name metadata to match policy entries, potentially gaining unautho
- 8.8 High severity
OpenClaw: Authentication Bypass by Spoofing
OpenClaw before 2026.5.22 contains a locality validation vulnerability in Control UI pairing that allows attackers with network access to spoof locality information and obtain durable admin-capable device tokens. Attackers can exploit insufficient locality-der
- 8.8 High severity
OpenClaw: Authentication Bypass by Spoofing
OpenClaw before 2026.5.7 contains a privilege escalation vulnerability in the Matrix allowFrom feature that allows authenticated accounts to match policy entries through mutable display name metadata. Attackers with the ability to change display names can rece
- 7.0 High severity
Smart Connect: Authentication Bypass by Spoofing
A potential authentication bypass was reported in Lenovo Smart Connect for Windows that could allow a local authenticated user to execute arbitrary code with elevated privileges.
- 7.5 High severity
Advanced Access Manager: Authentication Bypass by Spoofing
Authentication Bypass by Spoofing vulnerability in AAM Plugin Advanced Access Manager allows URL Encoding. This issue affects Advanced Access Manager: from n/a through 7.1.0.
- 7.5 High severity
freescout: Authentication Bypass by Spoofing
FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. Prior to 1.8.220, the email processing pipeline in FreeScout's FetchEmails command has two code paths for identifying agent (user) replies based on In-Reply-To / References head
- 9.8 Critical severity
SillyTavern: Authentication Bypass by Spoofing
SillyTavern is a locally installed user interface that allows users to interact with text generation large language models, image generation engines, and text-to-speech voice models. Prior to 1.18.0, SillyTavern accepts Remote-User (Authelia) and X-Authentik-U
- 8.8 High severity
UFO: Authentication Bypass by Spoofing
Microsoft UFO open-source framework for intelligent automation across devices and platforms. In 3.0.1-4-ge2626659, Microsoft UFO's WebSocket control plane trusts client-supplied identity and role fields in task messages. A client connection can register as a n
- 8.8 High severity
Simplicity SDK: Authentication Bypass by Spoofing
An attacker is able to downgrade the security of a Bluetooth LE connection by deleting an existing bond, spoofing the bonded device and creating a new bond.
- 7.5 High severity
Red Hat build of Keycloak 26.2: Authentication Bypass by Spoofing
A session fixation vulnerability was found in Keycloak's login-actions endpoints. An unauthenticated attacker could exploit this flaw by pre-creating an authentication session and tricking a victim into visiting a maliciously crafted link. By leveraging the /l
- 7.5 High severity
fleet: Authentication Bypass by Spoofing
Fleet is open source device management software. Prior to version 4.80.1, a vulnerability in Fleet's IP extraction logic allows unauthenticated attackers to bypass API rate limiting by spoofing client IP headers. This may allow brute-force login attempts or ot