Weakness (CWE)
CWE-347: Improper Verification of Cryptographic Signature
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
Source: MITRE CWE-347
44 results · Clear filters · Feed
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Critical 9.1CVE-2026-117691 Public exploit
Keycloak-services: keycloak-services: saml redirect binding signature bypass via percent-encoded parameter names
A flaw was found in the SAML HTTP-Redirect binding implementation of Keycloak. The issue occurs because the server processes percent-encoded parameter names (like %53AMLResponse) while the signature verification logic only checks literal parameter names. An a…
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High 8.1CVE-2026-87004 Public exploit
Tugtainer: OIDC id_token claims accepted without signature/audience/expiry verification
Tugtainer is a self-hosted app for automating updates of Docker containers. Prior to version 1.31.3, when the OIDC login flow completes, backend/modules/auth/providers/auth_oidc_provider.py decodes the id_token returned by the identity provider's token endpoi…
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Critical 9.1CVE-2026-102268 Public exploit
PyJWT: Asymmetric-PEM detection bypass: whitespace/line-ending-mutated public keys skip the HS/asymmetric confusion guard
PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, is_pem_format in jwt/utils.py is affected because is_pem_format does not recognize every PEM representation accepted by the cryptography loader. This occurs when an application mix…
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Critical 9.8CVE-2026-96760 Public exploit
Authlib library contains a signature‑verification bypass vulnerability
Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability. The JsonWebSignature.deserialize_json() method accepts a JSON Serialization JWS object and returns the payload as successfully verified without checking for a signature and wit…
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Critical 9.2
SSH user impersonation possible in Mikrotik RouterOS
RouterOS does not compare the complete RSA public key when matching an SSH authentication request to an authorized user key, checking the key type and modulus but omitting the exponent. Because signature verification uses the client-supplied key, an attacker …
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Critical 9.8CVE-2026-76581 Public exploit
WPMU DEV Dashboard <= 5.0.1 - Authentication Bypass to Administrator via SSO HMAC Canonicalization Confusion
The WPMU DEV Dashboard plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 5.0.1. This is due to inconsistent and ambiguous HMAC message construction between the unauthenticated `wdpsso_step1` and `wdpsso_step2` A…
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Critical 9.8CVE-2021-43716 Public exploit
Verification Bypass vulnerability exists in EPSON 150075647YWWV110 EasyMP Network Updater Ver.1.20. The Epson projector…
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Critical 10.0
Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account Takeover
The JWT authentication mechanism accepts tokens signed with algorithms other than those explicitly configured or supported. This allows an attacker to craft a JWT with an unsupported algorithm, which is then incorrectly validated, leading to unauthorized acce…
KEV Sep 24, 2026 -
Critical 9.8CVE-2026-59243 Public exploit
Apache Airflow FAB provider: FAB auth manager: JWT signature verification disabled by default for Azure AD OAuth (`verify_signature` defaults to `False`)
The FAB auth manager's Azure AD OAuth login defaulted `verify_signature=False` when decoding the ID token, so an attacker able to present a forged or unsigned (`alg:none`) ID token to the OAuth callback could bypass authentication and log in as an arbitrary u…
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High 8.8CVE-2026-65616 Public exploit
Potential privilege escalation to JFrog administrator privileges
Incorrect authorization validation in refresh token signature allows non-admin users to obtain a signed JFrog administrator token.
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Critical 9.8CVE-2026-15013 Public exploit
SAML Single Sign On <= 5.4.3 - Unauthenticated Authentication Bypass via 'SAMLResponse' Parameter Signature Algorithm Confusion
The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass via SAML Signature Algorithm Confusion in all versions up to, and including, 5.4.3. The vulnerability exists because `Mo_SAML_Utilities::mo_saml_cast_key()` reads …
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Critical 10.0
SimpleHelp Authentication Bypass via Missing OIDC JWT Signature Verification
SimpleHelp versions 5.5.15 and prior and 6.0 pre-release versions contain an authentication bypass vulnerability in the OIDC authentication flow. When OIDC authentication is configured, identity tokens submitted during login are accepted without verifying the…
KEV Jun 29, 2026 -
High 8.1CVE-2026-10795 Public exploit
UpdraftPlus: WP Backup & Migration Plugin <= 1.26.4 - Unauthenticated Authentication Bypass via UpdraftCentral udrpc
The UpdraftPlus: WP Backup & Migration Plugin plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 1.26.4 via the UpdraftPlus_Remote_Communications_V2::wp_loaded function. This is due to insufficient validation of …
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High 7.5CVE-2026-44714 Public exploit
bitcoinj: ScriptExecution P2PKH/P2WPKH Verification Bypass
The bitcoinj library is a Java implementation of the Bitcoin protocol. Prior to 0.17.1, ScriptExecution.correctlySpends() contains two fast-path verification bugs for standard P2PKH and native P2WPKH spends in core/src/main/java/org/bitcoinj/script/ScriptExec…
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Low 2.7CVE-2026-0265 Public exploit
PAN-OS: Authentication Bypass with Cloud Authentication Service (CAS) enabled
An authentication bypass vulnerability in Palo Alto Networks PAN-OS® software enables an unauthenticated attacker with network access to bypass authentication controls when Cloud Authentication Service (CAS) is enabled. The risk is higher if CAS is enabled on…
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High 7.5CVE-2026-5050 Public exploit
Payment Gateway for Redsys & WooCommerce Lite <= 7.0.0 - Improper Verification of Cryptographic Signature to Unauthenticated Payment Status Manipulation
The Payment Gateway for Redsys & WooCommerce Lite plugin for WordPress is vulnerable to Improper Verification of Cryptographic Signature in versions up to, and including, 7.0.0 due to successful_request() handlers calculating a local signature but not validat…
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Critical 9.1CVE-2026-29000 Public exploit
pac4j-jwt JwtAuthenticator Authentication Bypass
pac4j-jwt versions prior to 4.5.9, 5.7.9, and 6.3.3 contain an authentication bypass vulnerability in JwtAuthenticator when processing encrypted JWTs that allows remote attackers to forge authentication tokens. Attackers who possess the server's RSA public ke…
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High 8.1CVE-2026-1529 Public exploit
Org.keycloak.services.resources.organizations: keycloak: unauthorized organization registration via improper invitation token validation
A flaw was found in Keycloak. An attacker can exploit this vulnerability by modifying the organization ID and target email within a legitimate invitation token's JSON Web Token (JWT) payload. This lack of cryptographic signature verification allows the attack…
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Critical 9.1
A improper verification of cryptographic signature vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0…
KEV Dec 16, 2025 -
High 7.5CVE-2025-65945 Public exploit
auth0/node-jws improper HMAC signature verification vulnerability
auth0/node-jws is a JSON Web Signature implementation for Node.js. In versions 3.2.2 and earlier and version 4.0.0, auth0/node-jws has an improper signature verification vulnerability when using the HS256 algorithm under specific conditions. Applications are …
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High 7.0CVE-2025-34324 Public exploit
GoSign Desktop < 2.4.1 Insecure Update Mechanism RCE
GoSign Desktop versions 2.4.0 and earlier use an unsigned update manifest for distributing application updates. The manifest contains package URLs and SHA-256 hashes but is not digitally signed, so its authenticity relies solely on the underlying TLS channel.…
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Critical 9.8CVE-2025-9485 Public exploit
OAuth Single Sign On – SSO (OAuth Client) <= 6.26.12 - Authentication Bypass via get_resource_owner_from_id_token()
The OAuth Single Sign On – SSO (OAuth Client) plugin for WordPress is vulnerable to Improper Verification of Cryptographic Signature in versions up to, and including, 6.26.12. This is due to the plugin performing unsafe JWT token processing without verificati…
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Critical 9.4CVE-2025-59934 Public exploit
Formbricks missing JWT signature verification
Formbricks is an open source qualtrics alternative. Prior to version 4.0.1, Formbricks is missing JWT signature verification. This vulnerability stems from a token validation routine that only decodes JWTs (jwt.decode) without verifying their signatures. Both…
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Medium 4.6
In IGEL OS before 11, Secure Boot can be bypassed because the igel-flash-driver module improperly verifies a cryptograp…
KEV Oct 14, 2025 -
Critical 9.3
xml-crypto Vulnerable to XML Signature Verification Bypass via DigestValue Comment
xml-crypto is an XML digital signature and encryption library for Node.js. An attacker may be able to exploit a vulnerability in versions prior to 6.0.1, 3.2.1, and 2.1.6 to bypass authentication or authorization mechanisms in systems that rely on xml-crypto …
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Critical 9.3CVE-2025-29774 Public exploit
xml-crypto Vulnerable to XML Signature Verification Bypass via Multiple SignedInfo References
xml-crypto is an XML digital signature and encryption library for Node.js. An attacker may be able to exploit a vulnerability in versions prior to 6.0.1, 3.2.1, and 2.1.6 to bypass authentication or authorization mechanisms in systems that rely on xml-crypto …
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High 7.6CVE-2025-23369 Public exploit
Improper Verification of Cryptographic Signature in GitHub Enterprise Server Allows Signature Spoofing by Improper Validation
An improper verification of cryptographic signature vulnerability was identified in GitHub Enterprise Server that allowed signature spoofing for unauthorized internal users. Instances not utilizing SAML single sign-on or where the attacker is not already an e…
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High 8.8CVE-2024-7479 Public exploit
Improper signature verification of VPN driver installation in TeamViewer Remote Clients
Improper verification of cryptographic signature during installation of a VPN driver via the TeamViewer_service.exe component of TeamViewer Remote Clients prior version 15.58.4 for Windows allows an attacker with local unprivileged access on a Windows system …
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High 7.7CVE-2024-8698 Public exploit
Keycloak-saml-core: improper verification of saml responses leading to privilege escalation in keycloak
A flaw exists in the SAML signature validation method within the Keycloak XMLSignatureUtil class. The method incorrectly determines whether a SAML signature is for the full document or only for specific assertions based on the position of the signature in the…
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Critical 10.0
The Ruby SAML library vulnerable to a SAML authentication bypass via Incorrect XPath selector
The Ruby SAML library is for implementing the client side of a SAML authorization. Ruby-SAML in <= 12.2 and 1.13.0 <= 1.16.0 does not properly verify the signature of the SAML Response. An unauthenticated attacker with access to any signed saml document (by t…
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Medium 5.3CVE-2024-42461 Public exploit
Elliptic allows BER-encoded signatures
In the Elliptic package 6.5.6 for Node.js, ECDSA signature malleability occurs because BER-encoded signatures are allowed.
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Critical 10.0CVE-2024-32962 Public exploit
XML signature verification bypass due improper verification of signature / signature spoofing
xml-crypto is an xml digital signature and encryption library for Node.js. In affected versions the default configuration does not check authorization of the signer, it only checks the validity of the signature per section 3.2.2 of the w3 xmldsig-core-2008061…
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High 7.4CVE-2022-39299 Public exploit
Signature bypass via multiple root elements in Passport-SAML
Passport-SAML is a SAML 2.0 authentication provider for Passport, the Node.js authentication library. A remote attacker may be able to bypass SAML authentication on a website using passport-saml. A successful attack requires that the attacker is in possession…
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High 7.8CVE-2021-1366 Public exploit
Cisco AnyConnect Secure Mobility Client for Windows with VPN Posture (HostScan) Module DLL Hijacking Vulnerability
A vulnerability in the interprocess communication (IPC) channel of Cisco AnyConnect Secure Mobility Client for Windows could allow an authenticated, local attacker to perform a DLL hijacking attack on an affected device if the VPN Posture (HostScan) Module is…
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Medium 6.5CVE-2021-21239 Public exploit
Open default xmlsec1 key-type preference
PySAML2 is a pure python implementation of SAML Version 2 Standard. PySAML2 before 6.5.0 has an improper verification of cryptographic signature vulnerability. Users of pysaml2 that use the default CryptoBackendXmlSec1 backend and need to verify signed SAML d…
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Medium —CVE-2020-28042 Public exploit
Signature validation bypass in ServiceStack
ServiceStack before 5.9.2 mishandles JWT signature verification unless an application has a custom ValidateToken function that establishes a valid minimum length for a signature.
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Unscored —CVE-2020-10759 Public exploit
A PGP signature bypass flaw was found in fwupd (all versions), which could lead to the installation of unsigned firmwar…
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Critical 10.0
PAN-OS: Authentication Bypass in SAML Authentication
When Security Assertion Markup Language (SAML) authentication is enabled and the 'Validate Identity Provider Certificate' option is disabled (unchecked), improper verification of signatures in PAN-OS SAML authentication enables an unauthenticated network-base…
KEV Mar 25, 2022 -
Medium 6.8CVE-2020-9047 Public exploit
exacqVision Software - Improper Verification of Cryptographic Signature
A vulnerability exists that could allow the execution of unauthorized code or operating system commands on systems running exacqVision Web Service versions 20.06.3.0 and prior and exacqVision Enterprise Manager versions 20.06.4.0 and prior. An attacker with a…
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High 7.5
Improper Verification of Cryptographic Signature in golang.org/x/crypto
golang.org/x/crypto before v0.0.0-20200220183623-bac4c82f6975 for Go allows a panic during signature verification in the golang.org/x/crypto/ssh package. A client can attack an SSH server that accepts public keys. Also, a server can attack any SSH client.