Signature-Bypass

A low-privileged local attacker can exploit CVE-2026-14837, an improper signature verification vulnerability, in multiple Lenze products including models c430, c520, c550, i950 GenA, and i950 GenB to bypass the verification of the SSH enable file signature, subsequently enabling SSH access on the affected device, resulting in unauthorized administrative access and complete system compromise.

Jovancoding Network-AI versions before 5.13.4 are vulnerable to an improper cryptographic signature verification flaw (CVE-2026-64623) in the APSAdapter component, allowing unauthenticated attackers to bypass signature validation by submitting forged APS delegation payloads with arbitrary scopes to obtain signed permission tokens for sensitive resources, including SHELL_EXEC capabilities.

A critical vulnerability, CVE-2026-52767, in YesWiki's `HttpSignatureService::verifySignature()` allows unauthenticated attackers to bypass ActivityPub signature verification due to a loose boolean negation (`!openssl_verify(...)`) accepting `int(-1)` from PHP's `openssl_verify()` under specific conditions, enabling arbitrary Create, Update, and Delete operations on ActivityPub-enabled forms leading to defacement and content manipulation.

Coder is vulnerable to a PKCS#7 signature bypass in Azure instance identity (CVE-2026-46354), allowing unauthenticated agent token theft via a forged vmId, enabling access to Git SSH private keys, OAuth access tokens, and workspace secrets.

The AVX2 implementation of ML-DSA verification in libcrux-ml-dsa mishandles an edge case in the `use_hint` function, potentially allowing an attacker to craft an invalid signature that is accepted by the verifier if the AVX2 implementation is used.

Admidio's SAML Identity Provider implementation fails to properly validate signatures on SAML AuthnRequests and LogoutRequests, enabling attackers to bypass signature enforcement, potentially disclose user attributes via forged SSO requests, and terminate user sessions via forged SLO requests.

A vulnerability in the Stripe webhook handler allows an unauthenticated attacker to forge webhook events and credit arbitrary quota to their account without payment, stemming from an empty StripeWebhookSecret and lack of PaymentMethod validation, enabling cross-gateway exploitation.

CVE-2026-40372 is a critical vulnerability in ASP.NET Core stemming from improper cryptographic signature verification, potentially enabling unauthorized attackers to achieve network-based privilege escalation.

Jsrsasign versions before 11.1.1 are vulnerable to an incorrect conversion between numeric types vulnerability, where an attacker can force the computation of incorrect modular inverses and break signature verification by calling modPow with a negative exponent.

A vulnerability exists in goxmlsig versions prior to 1.6.0 related to loop variable capture in the `validateSignature` function when using older Go versions, leading to incorrect signature validation.

A vulnerability exists in yansongda/pay where signature verification is skipped when the Host header is `localhost`, allowing attackers to forge payment notifications.

Helm versions 4.0.0 through 4.1.3 fail to enforce plugin signature verification when the .prov file is missing, allowing installation of unsigned plugins and potentially leading to arbitrary code execution.

epa4all-client is vulnerable to a signature verification bypass where the ECDSA signature verification discards the boolean return value, allowing any structurally valid signature to be considered trusted.