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...

CVE-2026-11366

The MonsterInsights WordPress plugin before 11.1.0 is affected by an unauthenticated signature validation flaw in one AJAX action: when not connected to Google Analytics, the HMAC signing key is empty, enabling attackers to forge a valid signature and overwrite a configuration value, disrupting s...

CVE-2026-11366 MonsterInsights < 11.1.0 - Unauthenticated Measurement Protocol Secret Update via Empty-Key HMAC Bypass

The MonsterInsights WordPress plugin before 11.1.0 does not correctly validate the signature on one of its unauthenticated AJAX actions: when the MonsterInsights WordPress plugin before 11.1.0 is not connected to Google Analytics the HMAC signing key is empty, which lets unauthenticated attackers...

Security Bulletin: IBM MAS uses axios-1.15.2, protobufjs-8.0.1 and undici-7.26 which is vulnerable to multiple CVEs, and contains vulnerabilities related to missing Secure attribute on mas-redirect-uri cookie and weak HMAC Session Secret

Summary IBM Maximo Application Suite uses axios-1.15.2.tgz, protobufjs-8.0.1.tgz, protobufjs-8.2.0.tgz and undici-7.26.0.tgz which is vulnerable to CVE-2026-11525, CVE-2026-12151, CVE-2026-6733, CVE-2026-6734, CVE-2026-9678, CVE-2026-9679, CVE-2026-9697, CVE-2026-54270, CVE-2026-45740,...

CVE-2026-53501 Thumbor has HMAC validation bypass via multiple .replace() calls when removing URL signature

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, Thumbor’s HMAC validation can be bypassed due to the use of Python’s .replace when removing the signature from the URL before validation. Since .replace removes all occurrences of the substring, an attacker can insert...

CVE-2026-53501 Thumbor has HMAC validation bypass via multiple .replace() calls when removing URL signature

Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, Thumbor’s HMAC validation can be bypassed due to the use of Python’s .replace when removing the signature from the URL before validation. Since .replace removes all occurrences of the substring, an attacker can insert...

CVE-2026-53501

Thumbor (open-source image thumbnail service by globo.com) is affected prior to version 7.8.0. The vulnerability stems from using Python’s .replace() to strip the signature from the URL before HMAC validation, which removes all occurrences of the substring. An attacker can insert the same signatu...

CVE-2026-14490

The CVE concerns the Demi – One Click Demo Import, WP Backup & Site Migration WordPress plugin. All versions up to 0.0.7 are affected due to the plugin storing its HMAC signing key and per-step restore token as dotfiles inside a publicly accessible uploads subdirectory without protection. The una...

MiracleLinux 9 : openssl-3.5.5-4.el9_8.ML.1 (AXSA:2026-1339:14)

The remote MiracleLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-1339:14 advisory. openssl: OpenSSL: Heap buffer overflow due to signed integer overflow in Unicode output sizing CVE-2026-7383 openssl: OpenSSL: Denial of Service due...

CVE-2026-13184

This CVE affects Progress Telerik UI for ASP.NET AJAX (RadAsyncUpload) prior to v2026.2.708. The root cause is that if Telerik.Upload.ConfigurationHashKey is absent and machineKey is not explicitly configured, upload metadata integrity protection may fall back to a predictable default key, allowi...

GHSA-HG5R-VQ93-9FV6 Gitea Actions Artifacts V4 signed URL HMAC ambiguity allows cross-repository artifact read and cross-task upload-state write

Summary Gitea Actions Artifacts V4 signed upload/download URLs can be rewritten to access a different running task and repository context while preserving the original HMAC signature. An attacker with permission to run a Gitea Actions job can turn a signed URL for an attacker-controlled artifact...

Improper Verification of Cryptographic Signature

Overview Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature in the CheckSignedInfoKeyedHashAlgorithm method of SignedXml, which compares only the first SignatureValue.Length bytes of the computed HMAC against the supplied signature value. An...

CVE-2026-53591

FreeScout (Laravel-based) prior to v1.8.223 is vulnerable: an unauthenticated attacker can inject messages into existing conversations by sending an email to the public address with a crafted In-Reply-To header. The injected message appears as a legitimate customer reply, reopens the conversation...

CVE-2026-44978 xrdp: Unchecked FIPS padding length in standard RDP Security causes heap out-of-bounds read in HMAC verification

xrdp is an open source RDP server. Versions 0.10.6 and prior contain a heap out-of-bounds read vulnerability within the FIPS-specific receive paths. This vulnerability does not affect the default configuration of xrdp. The vulnerability is only exploitable when the security layer is set to...

CVE-2026-9537

Mojo::JWT versions before 1.02 for Perl verify HMAC signatures with a...

Linux Distros Unpatched Vulnerability : CVE-2026-49852

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption JOSE standards. Prior to 1.6.8, joserfc.jwt.decode...

DEBIAN-CVE-2026-49852

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption JOSE standards. Prior to 1.6.8, joserfc.jwt.decode accepts attacker-forged HMAC-signed tokens when the caller-supplied verification key is the empty string or None, because HMACAlgorithm.sign...

CVE-2026-49852

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption JOSE standards. Prior to 1.6.8, joserfc.jwt.decode accepts attacker-forged HMAC-signed tokens when the caller-supplied verification key is the empty string or None, because HMACAlgorithm.sign...

CVE-2026-49852 joserfc: HS256/HS384/HS512 verify accepts empty/nil HMAC key (cross-language sibling of CVE-2026-45363)

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption JOSE standards. Prior to 1.6.8, joserfc.jwt.decode accepts attacker-forged HMAC-signed tokens when the caller-supplied verification key is the empty string or None, because HMACAlgorithm.sign...

EUVD-2026-45281

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption JOSE standards. Prior to 1.6.8, joserfc.jwt.decode accepts attacker-forged HMAC-signed tokens when the caller-supplied verification key is the empty string or None, because HMACAlgorithm.sign...