Common Weakness Enumeration
CWE-290
AllowedAuthentication Bypass by Spoofing
Abstraction: Base · Status: Incomplete
This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.
1076 vulnerabilities reference this CWE, most recent first.
CVE-2026-90447 (GCVE-0-2026-90447)
Vulnerability from cvelistv5 – Published: 2026-09-11 21:48 – Updated: 2026-09-11 21:48
VLAI
EPSS
VEX
Summary
A routing rule selects between two different authentication mechanisms for the same downstream service based on the value of a client-supplied request header, rather than on any property the client cannot control. An authenticated user in possession of a shared service credential can set this header to route around the primary role-based authorization check and reach the alternate path's fixed, elevated role instead. This allows a low-privileged authenticated attacker who knows the shared credential to perform actions reserved for a higher-privileged role.
Severity
CWE
- CWE-290 - Authentication bypass by spoofing
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://raw.githubusercontent.com/cisagov/CSAF/de… | government-resourcevendor-advisory |
Impacted products
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CVE-2026-88879 (GCVE-0-2026-88879)
Vulnerability from cvelistv5 – Published: 2026-09-10 13:05 – Updated: 2026-09-10 15:04
VLAI
EPSS
VEX
Title
Traefik before v2.11.56 Identity Spoofing via Header Alias
Summary
Traefik is an HTTP reverse proxy and load balancer. In Traefik v1.x, v2.x through v2.11.55, and v3.0.0 through v3.7.11, header names are canonicalized only on dashes, so X-Auth-User, X_Auth_User and X.Auth.User are treated as three distinct headers by Traefik, while backends that derive variable names from header names (CGI, WSGI, PHP, NGINX and others) collapse them into a single variable. A client can therefore smuggle a dot-form alias of a header that Traefik manages past the middleware managing it — for example supplying X.Authenticated.User alongside the canonical X-Authenticated-User written by the ForwardAuth middleware — causing such a backend to read the client-supplied value instead of the identity Traefik asserted. In the tested configuration (PHP 8.2 built-in SAPI over an HTTP/1 backend path), Go's lexical header ordering makes the attacker-supplied value win deterministically, so a client that ForwardAuth admits as a low-privilege identity can be treated by the backend as a different user or role. Any header Traefik sets is affected, not only ForwardAuth's. This is an incomplete fix for GHSA-x677-9fxg-v5c5, which blocked only the underscore form. Fixed in v2.11.56 and v3.7.12, which add the aliasHeadersStrategy entry-point option; because it defaults to 'keep' for backwards compatibility, it must be explicitly set to 'delete' or 'reject' for the fix to take effect. Unmaintained release lines will not receive a patch.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-10 15:03 UTC
CWE
- CWE-290 - Authentication Bypass by Spoofing
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/traefik/traefik/security/advis… | vendor-advisory |
| https://www.vulncheck.com/advisories/traefik-befo… | third-party-advisory |
Impacted products
Date Public
2026-08-27 00:00
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CVE-2026-88011 (GCVE-0-2026-88011)
Vulnerability from cvelistv5 – Published: 2026-09-10 15:31 – Updated: 2026-09-10 15:31
VLAI
EPSS
VEX
Title
Traefik: ForwardAuth identity spoofing via dot-form header alias
Summary
Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.56, and from 3.0.0 until 3.7.12, a client-supplied dot-form header such as X.Authenticated.User survives ForwardAuth replacement and underscoreHeadersStrategy because Go treats it as distinct from X-Authenticated-User while normalization-prone CGI, WSGI, PHP, and NGINX backends collapse both names. A backend can consequently consume the client value instead of the identity Traefik asserted, allowing identity spoofing for any header managed by Traefik. The aliasHeadersStrategy protection is disabled by default and must be configured as delete or reject. The mitigation is available in 2.11.56 and 3.7.12.
Severity
CWE
- CWE-290 - Authentication Bypass by Spoofing
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/traefik/traefik/security/advis… | x_refsource_CONFIRM |
| https://github.com/traefik/traefik/pull/13720 | x_refsource_MISC |
| https://github.com/traefik/traefik/commit/0331801… | x_refsource_MISC |
| https://github.com/traefik/traefik/releases/tag/v… | x_refsource_MISC |
| https://github.com/traefik/traefik/releases/tag/v3.7.12 | x_refsource_MISC |
Impacted products
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CVE-2026-87785 (GCVE-0-2026-87785)
Vulnerability from cvelistv5 – Published: 2026-09-14 10:38 – Updated: 2026-09-14 10:38
VLAI
EPSS
VEX
Title
Apache Syncope: JWT subject spoofing
Summary
Authentication bypass by spoofing vulnerability in Apache Syncope.
When the configured JWKS settings for internal JWT authentication are disclosed (at least protocol and key), an attacker can spoof another user's privileges after completing a successful authentication and obtaining a valid JWT.
This issue affects Apache Syncope: from 3.0.0-M0 through 3.0.16, from 4.0.0-M0 through 4.0.7, from 4.1.0-M0 through 4.1.2.
Users are recommended to upgrade to version 4.0.8 / 4.1.3, which fix this issue.
Severity
No CVSS data available.
CWE
- CWE-290 - Authentication bypass by spoofing
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/3t3om8mny7ng52q05… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Syncope |
Affected:
3.0.0-M0 , ≤ 3.0.16
(semver)
Affected: 4.0.0-M0 , ≤ 4.0.7 (semver) Affected: 4.1.0-M0 , ≤ 4.1.2 (semver) |
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CVE-2026-86196 (GCVE-0-2026-86196)
Vulnerability from cvelistv5 – Published: 2026-09-05 12:09 – Updated: 2026-09-08 17:18
VLAI
EPSS
VEX
Title
Grav API Plugin before 1.0.20 Authentication Bypass via Host Header
Summary
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Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 17:17 UTC
CWE
- CWE-290 - Authentication Bypass by Spoofing
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/getgrav/grav/security/advisori… | vendor-advisory |
| https://www.vulncheck.com/advisories/grav-api-plu… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| getgrav | grav-plugin-api |
Affected:
0 , < 1.0.20
(semver)
Unaffected: 1.0.20 (semver) cpe:2.3:a:getgrav:grav:*:*:*:*:*:*:*:* |
Date Public
2026-08-21 00:00
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CVE-2026-85432 (GCVE-0-2026-85432)
Vulnerability from cvelistv5 – Published: 2026-09-03 22:38 – Updated: 2026-09-04 18:33
VLAI
EPSS
VEX
Title
MOOS core-moos through 10.4.0 MOOSDB Message Source Spoofing via Wire Identity
Summary
MOOS core-moos through 10.4.0 fails to validate client identity in MOOSDB message processing, allowing authenticated attackers to attribute writes to other clients by supplying arbitrary source identifiers in serialized messages. Attackers can forge message origins and cancel third-party subscriptions by exploiting the disconnect between authenticated connection identity and wire-supplied source attribution.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 18:32 UTC
CWE
- CWE-290 - Authentication Bypass by Spoofing
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/themoos/core-moos/pull/76 | issue-trackingpatch |
| https://github.com/themoos/core-moos/commit/26308… | patch |
| https://github.com/themoos/core-moos | product |
| https://github.com/themoos/core-moos/blob/ec9c77c… | technical-description |
| https://www.vulncheck.com/advisories/moos-core-mo… | third-party-advisory |
Impacted products
Date Public
2026-09-01 00:00
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CVE-2026-84849 (GCVE-0-2026-84849)
Vulnerability from cvelistv5 – Published: 2026-09-03 16:31 – Updated: 2026-09-03 17:51
VLAI
EPSS
VEX
Title
WordPress Pre-Orders for WooCommerce plugin <= 2.3 - Bypass Vulnerability vulnerability
Summary
Unauthenticated Bypass Vulnerability in Pre-Orders for WooCommerce <= 2.3 versions.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-03 17:51 UTC
CWE
- CWE-290 - Authentication Bypass by Spoofing
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://patchstack.com/database/wordpress/plugin/… | vdb-entry |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| brightvesseldev | Pre-Orders for WooCommerce |
Affected:
n/a , ≤ 2.3
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CVE-2026-84766 (GCVE-0-2026-84766)
Vulnerability from cvelistv5 – Published: 2026-09-03 16:31 – Updated: 2026-09-05 01:51
VLAI
EPSS
VEX
Title
WordPress FluentBooking Pro plugin <= 2.2.1 - Bypass Vulnerability vulnerability
Summary
Unauthenticated Bypass Vulnerability in FluentBooking Pro <= 2.2.1 versions.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-05 01:51 UTC
CWE
- CWE-290 - Authentication Bypass by Spoofing
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://patchstack.com/database/wordpress/plugin/… | vdb-entry |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| WP Manage Ninja | FluentBooking Pro |
Affected:
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CVE-2026-84479 (GCVE-0-2026-84479)
Vulnerability from cvelistv5 – Published: 2026-09-01 22:25 – Updated: 2026-09-02 11:43
VLAI
EPSS
VEX
Title
WWBN AVideo Authentication Bypass via User-Agent Header
Summary
WWBN AVideo (current e01e41ecc and earlier) makes three login-time security controls depend solely on the client-supplied User-Agent header. The isAVideoEncoder()/isAVideoMobileApp() checks match HTTP_USER_AGENT against a hardcoded literal ("AVideoEncoder"/"AVideoMobileApp") with no IP check or shared secret. An attacker who submits valid credentials and sets User-Agent: AVideoEncoder bypasses two-factor authentication, skips brute-force captcha escalation, and avoids being recorded in the login/device audit history. No patch is available at the time of publication.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 11:40 UTC
CWE
- CWE-290 - Authentication Bypass by Spoofing
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/WWBN/AVideo/security/advisorie… | vendor-advisory |
| https://www.vulncheck.com/advisories/wwbn-avideo-… | third-party-advisory |
Impacted products
Date Public
2026-08-18 00:00
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CVE-2026-84476 (GCVE-0-2026-84476)
Vulnerability from cvelistv5 – Published: 2026-09-01 22:25 – Updated: 2026-09-02 13:07
VLAI
EPSS
VEX
Title
WWBN AVideo Authentication Bypass via X-Real-IP Header
Summary
WWBN AVideo fails to validate trusted proxies before accepting X-Real-IP and X-Forwarded-For headers, allowing attackers to spoof the client address used by enforceRateLimit(). Attackers can rotate the header value per request to bypass login rate limiting and perform unlimited credential guessing attacks.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 13:06 UTC
CWE
- CWE-290 - Authentication Bypass by Spoofing
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/WWBN/AVideo/security/advisorie… | vendor-advisory |
| https://www.vulncheck.com/advisories/wwbn-avideo-… | third-party-advisory |
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Date Public
2026-08-18 00:00
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No mitigation information available for this CWE.
CAPEC-21: Exploitation of Trusted Identifiers
An adversary guesses, obtains, or "rides" a trusted identifier (e.g. session ID, resource ID, cookie, etc.) to perform authorized actions under the guise of an authenticated user or service.
CAPEC-22: Exploiting Trust in Client
An attack of this type exploits vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by communicating directly with the server where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.
CAPEC-459: Creating a Rogue Certification Authority Certificate
An adversary exploits a weakness resulting from using a hashing algorithm with weak collision resistance to generate certificate signing requests (CSR) that contain collision blocks in their "to be signed" parts. The adversary submits one CSR to be signed by a trusted certificate authority then uses the signed blob to make a second certificate appear signed by said certificate authority. Due to the hash collision, both certificates, though different, hash to the same value and so the signed blob works just as well in the second certificate. The net effect is that the adversary's second X.509 certificate, which the Certification Authority has never seen, is now signed and validated by that Certification Authority.
CAPEC-461: Web Services API Signature Forgery Leveraging Hash Function Extension Weakness
An adversary utilizes a hash function extension/padding weakness, to modify the parameters passed to the web service requesting authentication by generating their own call in order to generate a legitimate signature hash (as described in the notes), without knowledge of the secret token sometimes provided by the web service.
CAPEC-473: Signature Spoof
An attacker generates a message or datablock that causes the recipient to believe that the message or datablock was generated and cryptographically signed by an authoritative or reputable source, misleading a victim or victim operating system into performing malicious actions.
CAPEC-476: Signature Spoofing by Misrepresentation
An attacker exploits a weakness in the parsing or display code of the recipient software to generate a data blob containing a supposedly valid signature, but the signer's identity is falsely represented, which can lead to the attacker manipulating the recipient software or its victim user to perform compromising actions.
CAPEC-59: Session Credential Falsification through Prediction
This attack targets predictable session ID in order to gain privileges. The attacker can predict the session ID used during a transaction to perform spoofing and session hijacking.
CAPEC-60: Reusing Session IDs (aka Session Replay)
This attack targets the reuse of valid session ID to spoof the target system in order to gain privileges. The attacker tries to reuse a stolen session ID used previously during a transaction to perform spoofing and session hijacking. Another name for this type of attack is Session Replay.
CAPEC-667: Bluetooth Impersonation AttackS (BIAS)
An adversary disguises the MAC address of their Bluetooth enabled device to one for which there exists an active and trusted connection and authenticates successfully. The adversary can then perform malicious actions on the target Bluetooth device depending on the target’s capabilities.
CAPEC-94: Adversary in the Middle (AiTM)
An adversary targets the communication between two components (typically client and server), in order to alter or obtain data from transactions. A general approach entails the adversary placing themself within the communication channel between the two components.