GHSA-JJ8C-MMJ3-MMGV Authlib: Cross-site request forging when using cache

Summary There is no CSRF protection on the cache feature on most integrations clients. Details In authlib.integrations.starletteclient.OAuth, no CSRF protection is set up when using the cache parameter. When not using the cache parameter, the use of SessionMiddleware ties the client to the auth...

PT-2026-35068

Name of the Vulnerable Software and Affected Versions Authlib versions prior to 1.6.11 Description Authlib is a Python library used to build OAuth and OpenID Connect servers. A lack of Cross-Site Request Forgery CSRF protection exists in the cache feature of the 'authlib.integrations.starlette...

The vulnerability of the JOSE library Authlib implementation for OAuth and OpenID Connect servers is related to insufficient verification of data authenticity, allowing attackers to execute arbitrary code.

The vulnerability of the JOSE library Authlib implementation for OAuth and OpenID Connect servers is related to insufficient verification of data authenticity. Exploiting this vulnerability allows a malicious actor to execute arbitrary code remotely...

The vulnerability of the JOSE library Authlib implementation for OAuth and OpenID Connect servers is related to errors in verifying cryptographic signatures. This allows attackers to circumvent existing security mechanisms.

The vulnerability of the JOSE library Authlib implementation for OAuth and OpenID Connect servers is related to errors in checking the cryptographic signature. Exploiting this vulnerability could allow a malicious actor to bypass existing security mechanisms remotely...

The vulnerability of the JOSE library Authlib implementation for OAuth and OpenID Connect servers is related to improper verification of integrity values, allowing attackers to bypass existing security mechanisms.

The vulnerability of the JOSE library Authlib implementation for OAuth and OpenID Connect servers is related to improper verification of integrity values. Exploiting this vulnerability could allow a malicious actor to bypass existing security mechanisms remotely...

SUSE: Security Advisory (SUSE-SU-2026:0975-1)

The remote host is missing an update for the SPDX-FileCopyrightText: 2026 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

openSUSE Security Advisory (SUSE-SU-2026:0975-1)

The remote host is missing an update for the SPDX-FileCopyrightText: 2026 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

SUSE SLED15 / SLES15 / openSUSE 15 Security Update : python-Authlib (SUSE-SU-2026:0975-1)

The remote SUSE Linux SLED15 / SLEDSAP15 / SLES15 / SLESSAP15 / openSUSE 15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:0975-1 advisory. - CVE-2026-27962: JWS deserializecompact allows for signature bypass by accepting user-controlle...

Security update for python-Authlib

This update for python-Authlib fixes the following issues: CVE-2026-27962: JWS deserializecompact allows for signature bypass by accepting user-controlled embedded JWK as verification key bsc1259738. CVE-2026-28490: cryptographic padding oracle in JWE RSA15 key management algorithm bsc1259736...

The vulnerability of the JOSE library Authlib implementation for OAuth and OpenID Connect servers allows a perpetrator to induce a service failure.

The vulnerability of the JOSE library Authlib implementation for OAuth and OpenID Connect servers is related to insufficient validation of input data. Exploiting this vulnerability can allow a malicious actor to cause service failures...

Authentication Bypass

Authlib is vulnerable to Authentication Bypass. The vulnerability is due to fail-open behavior in the verifyhash function when processing unsupported or unknown algorithms, where hash validation incorrectly returns success, allowing attackers to forge ID Tokens and bypass integrity checks...

OPENSUSE-SU-2026:20392-1 Security update for python-Authlib

This update for python-Authlib fixes the following issues: Changes in python-Authlib: - CVE-2026-27962: JWS deserializecompact allows for signature bypass by accepting user-controlled embedded JWK as verification key bsc1259738 - CVE-2026-28490: cryptographic padding oracle in JWE RSA15 key...

SUSE CVE-2026-27962

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a JWK Header Injection vulnerability in authlib's JWS implementation allows an unauthenticated attacker to forge arbitrary JWT tokens that pass signature verification. When key=None is passed to any...

SUSE CVE-2026-28490

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a cryptographic padding oracle vulnerability was identified in the Authlib Python library concerning the implementation of the JSON Web Encryption JWE RSA15 key management algorithm. Authlib registe...

SUSE CVE-2026-28498

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a library-level vulnerability was identified in the Authlib Python library concerning the validation of OpenID Connect OIDC ID Tokens. Specifically, the internal hash verification logic verifyhash...

Timing Attack

Overview authlib is a library in building OAuth and OpenID Connect servers. Affected versions of this package are vulnerable to Timing Attack via the unwrap length check in jwealgs.py. An attacker can recover the CEK and decrypt or forge JWE tokens by sending malformed RSA15 ciphertexts and...

Not Failing Securely ('Failing Open')

Overview authlib is a library in building OAuth and OpenID Connect servers. Affected versions of this package are vulnerable to Not Failing Securely 'Failing Open' via the verifyhash function in authlib/oidc/core/claims.py. An attacker can substitute an access token or authorization code undetect...

Improper Verification of Cryptographic Signature

Overview authlib is a library in building OAuth and OpenID Connect servers. Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the JsonWebSignature.preparealgorithmkey method in authlib/jose/rfc7515/jws.py. An attacker can bypass authenticatio...

CVE-2026-28498

A flaw was found in Authlib, a Python library used for building OAuth and OpenID Connect OIDC servers. This vulnerability allows a remote attacker to bypass critical integrity checks in OIDC ID Tokens. Specifically, the library's internal hash verification logic fails open when encountering an...

CVE-2026-28490

A flaw was found in Authlib, a Python library for building OAuth and OpenID Connect servers. This cryptographic padding oracle vulnerability, affecting the JSON Web Encryption JWE RSA15 key management algorithm, could allow a remote attacker to decrypt sensitive information. The vulnerability...