CVE-2018-0114

CVE-2018-0114 Cisco の node-jose（JWT を管理するために作成された JavaScript ライブラリ）の脆弱性の悪用。 Cisco の node-jose のこの脆弱性により、攻撃者は悪意のあるトークンを偽造できます。 JWT では、ユーザーはトークンのヘッダー内に公開鍵（jwk 値を使用）を埋め込むことができます。ただし、アプリケーションはそれらの鍵を決して信頼すべきではありません。攻撃者は自身の鍵を提供し、対応する秘密鍵を使用してメッセージに署名できるからです。 レビュー この問題はバージョン 0.11 より前のバージョンに影響します。...

POC-CVE-2018-0114

CVE-2018-0114 POC Cisco のオープンソースライブラリ node-jose の 0.11.0 より前のバージョンには、認証されていないリモートの攻撃者が、トークン内に埋め込まれた鍵を使用してトークンに再署名できる可能性がある脆弱性が存在します。この脆弱性は、node-jose が JSON Web Token JWT に対して JSON Web Signature JWS 標準に従っていることに起因します。この標準では、公開鍵を表す JSON Web Key JWK を JWS...

CVE-2018-0114-PoC

CVE-2018-0114 PoC PentesterLab 用に書きました PentesterLab から来た人はズルをしないでください。自分で学ぶ方がずっと良いです。 誰かの役に立てば幸いです。将来の自分じゃなければですが : 例 root@kitploit: $ python3 script.py Making keys... 'alg': 'RS256', 'jwk': 'kty': 'RSA', 'kid': '[email protected]', 'use': 'sig', 'n':...

jwt-spoof-tool

jwt-spoof-tool Tool Description : このツールは、学習目的と、burpsuite に依存せずに jwt トークンハイジャックを自動化するために作成しました。 コードは十分にドキュメント化されており、理解しやすい内容になっています。 CVE-2018-0114 に基づいています。 この脆弱性は、バックエンドでサーバーが jwt ヘッダー内に埋め込まれた jwk オブジェクトをチェックするために発生します。jwk オブジェクトには、公開鍵を形成するために使用される 2 つのパラメータである n と e が含まれています。 How to exploit : 1...

Linux Distros Unpatched Vulnerability : CVE-2026-54431

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - In liboauth2 the Demonstrating Proof-of-Possession DPoP verifier accepts a proof whose JSON Web Key jwk header contains private key material. RFC 9449 section 4...

AZL-91682 CVE-2026-54431 affecting package liboauth 1.0.3-15

In liboauth2 the Demonstrating Proof-of-Possession DPoP verifier accepts a proof whose JSON Web Key jwk header contains private key material. RFC 9449 section 4.3 step 7 requires the verifier to reject such a proof but oauth2tokenverify function returns success for a malformed DPoP proof that...

CVE-2026-54431

In liboauth2 the Demonstrating Proof-of-Possession DPoP verifier accepts a proof whose JSON Web Key jwk header contains private key material. RFC 9449 section 4.3 step 7 requires the verifier to reject such a proof but oauth2tokenverify function returns success for a malformed DPoP proof that...

CVE-2026-54431

In liboauth2 the Demonstrating Proof-of-Possession DPoP verifier accepts a proof whose JSON Web Key jwk header contains private key material. RFC 9449 section 4.3 step 7 requires the verifier to reject such a proof but oauth2tokenverify function returns success for a malformed DPoP proof that...

CVE-2026-54431 Improper Data Validation in liboauth2

In liboauth2 the Demonstrating Proof-of-Possession DPoP verifier accepts a proof whose JSON Web Key jwk header contains private key material. RFC 9449 section 4.3 step 7 requires the verifier to reject such a proof but oauth2tokenverify function returns success for a malformed DPoP proof that...

CVE-2026-54431 Improper Data Validation in liboauth2

In liboauth2 the Demonstrating Proof-of-Possession DPoP verifier accepts a proof whose JSON Web Key jwk header contains private key material. RFC 9449 section 4.3 step 7 requires the verifier to reject such a proof but oauth2tokenverify function returns success for a malformed DPoP proof that...

Security update for python-PyJWT

This update for python-PyJWT fixes the following issues CVE-2026-48522: PyJWKClient passes URI arguments directly to urllib.request.urlopen and allows for SSRF and token forgery bsc1266798. CVE-2026-48523: verifier-side algorithm allow-list bypass when jwt.decode or jwt.decodecomplete are called...

Important: python-jwt

Issue Overview: PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, when the verifier is decoding JSON Web Tokens, while supporting both asymmetric and HMAC algorithms, the library does not validate use of JSON Web Keys in HMAC algorithm, allowing attacker to use the issuer publi...

SUSE-SU-2026:22238-1 Security update for python-PyJWT

This update for python-PyJWT fixes the following issues - CVE-2026-48522: PyJWKClient passes URI arguments directly to urllib.request.urlopen and allows for SSRF and token forgery bsc1266798. - CVE-2026-48523: verifier-side algorithm allow-list bypass when jwt.decode or jwt.decodecomplete are...

EUVD-2026-32915

PyJWKClient: missing scheme allowlist enables CVE-2024-21643-class SSRF + token forgery via file://, ftp://, data: schemes...

python-pyjwt: PyJWT: Authentication bypass due to forged JSON Web Tokens

A flaw was found in PyJWT, a Python library for JSON Web Token JWT implementation. When decoding JWTs, the library fails to validate the use of JSON Web Keys JWK in the HMAC algorithm while also supporting asymmetric algorithms. This allows a remote attacker to use the issuer's public key as the...

SUSE CVE-2026-48522

PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, PyJWKClient passes its uri argument directly to urllib.request.urlopen which uses Python stdlib's default OpenerDirector registering HTTPHandler, HTTPSHandler, FTPHandler, FileHandler, and DataHandler. There is currently no...

SUSE CVE-2026-48526

PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, when the verifier is decoding JSON Web Tokens, while supporting both asymmetric and HMAC algorithms, the library does not validate use of JSON Web Keys in HMAC algorithm, allowing attacker to use the issuer public key as the...

Improper Verification of Cryptographic Signature

Overview Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the jwt.decode or jwt.decodecomplete functions when used with a PyJWK key. An attacker can bypass algorithm restrictions and gain unauthorized access to protected resources by signing...

DEBIAN-CVE-2026-48523

PyJWT is a JSON Web Token implementation in Python. From 2.9.0 to 2.12.1, there is a verifier-side algorithm allow-list bypass when jwt.decode or jwt.decodecomplete are called with a PyJWK key. The token header alg is checked against the caller-supplied algorithms allow-list, but signature...

PYSEC-0000-CVE-2026-48526

PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, when the verifier is decoding JSON Web Tokens, while supporting both asymmetric and HMAC algorithms, the library does not validate use of JSON Web Keys in HMAC algorithm, allowing attacker to use the issuer public key as the...