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CWE-347: Improper Verification of Cryptographic Signature, page 2

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The product does not verify, or incorrectly verifies, the cryptographic signature for data.

What the weakness is: CWE-347 at MITRE

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Show the promptExplain CWE-347: Improper Verification of Cryptographic Signature and how to prevent and detect it in code. Use https://cwe.mitre.org/data/definitions/347.html and https://cve.bz/cve/cwe/347?via=ask-ai-copy for recent CVEs with this weakness. Cite the sources.

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  1. 7.8CVE-2026-69650EPSS 0.3%

    Improper verification of cryptographic signature in Windows Key Distribution Center allows an authorized attacker to elevate privileges locally.

  2. 8.1CVE-2026-102866EPSS 0.7%

    Improper verification of cryptographic signature in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.

  3. 3.1CVE-2026-65197EPSS 0.10%

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  5. 7.5CVE-2026-85962EPSS 0.3%

    Progress MarkLogic Server 12.x releases before 12.1.0 and 11.x releases before 11.3.7 contain an improper authentication vulnerability in SAML processing. In deployments that use SAML authentication, an unauthenticated remote attacker coul…

  6. 7.5CVE-2026-103902EPSS 0.1%

    Improper verification of cryptographic signature vulnerability in DigiDoc libdigidocpp, DigiDoc DigiDoc4, DigiDoc DigiDoc Android, and DigiDoc DigiDoc iOS. The vulnerability allows an attacker to create forged digital signatures that are …

  7. 8.3CVE-2026-108699EPSS 0.2%

    hyper-mcp through 0.8.3 contains an improper signature verification vulnerability that allows attackers to load malicious WebAssembly plugins because cosign_verify_args() accepts any signer identity and OIDC issuer by default. Attackers co…

  8. 7.3CVE-2026-106581EPSS 0.07%

    Before 4.92.0, Docker Desktop for Windows did not verify the signature of a package supplied to Docker Desktop Installer.exe install -package. An attacker able to provide a crafted package and convince a user to approve the Docker-signed U…

  9. 9.8CVE-2026-86405EPSS 0.2%

    Improper verification of cryptographic signature vulnerability in Sipay Electronic Money and Payment Services Inc. PrestaShop Virtual POS Module allows Signature Spoofing by Improper Validation. This issue affects PrestaShop Virtual POS M…

  10. 9.8CVE-2026-85531EPSS 0.2%

    Improper verification of cryptographic signature vulnerability in Sipay Electronic Money and Payment Services Inc. OpenCart Virtual POS Module allows Signature Spoofing by Improper Validation. This issue affects OpenCart Virtual POS Modul…

  11. 5.3CVE-2026-103329EPSS 0.1%

    The Super Payments WordPress plugin before 1.43.1 does not properly verify the authenticity of incoming payment webhook notifications, as the signing key used to validate their signature is empty by default, allowing unauthenticated attack…

  12. 7.4CVE-2026-107724EPSS 0.3%

    fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.2.4, fast-jwt can classify raw serialized public JWK or JWKS JSON as an HMAC secret because src/crypto.js performDetectPublicKeyAlgorithms treats non-PEM strings as symmetric…

  13. 9.8CVE-2026-107722EPSS 0.4%

    fast-jwt provides fast JSON Web Token (JWT) implementation. From 6.2.0 until 6.3.0, fast-jwt can misclassify RSA public-key text as an HMAC secret when the key has non-whitespace content before its PEM header. In src/crypto.js, performDete…

  14. 7.4CVE-2026-107720EPSS 0.3%

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  15. 7.8CVE-2026-84271EPSS 0.07%

    IBM Guardium Data Protection 12.2 is vulnerable to a signature verification bypass in the patch installer. An attacker with local access could exploit this vulnerability to execute arbitrary code with root privileges.

  16. 7.5CVE-2026-14999EPSS 0.2%

    IBM DataPower Gateway 10.5.0.0 through 10.5.0.22, 10.6.1 through 10.6.6, 10.6.0.0 through 10.6.0.10, and 11.0.0.0 through 11.0.0.2 could allow a remote attacker to bypass authentication by forging valid JSON Web Signatures due to improper …

  17. 8.1CVE-2026-14497EPSS 0.6%

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  18. 10.0CVE-2026-76482EPSS 0.2%

    As part of Cisco's ongoing commitment to proactive security and product quality, the engineering team for Cisco License On-Prem, formerly Cisco Smart Software Manager On-Prem (SSM On-Prem), has conducted a comprehensive internal security r…

  19. 7.8CVE-2026-79807EPSS 0.08%

    A missing integrity verification vulnerability in the Windows client software for ClearPass Policy Manager could allow malicious users on a local instance to elevate their user privileges. A successful exploit could allow these users to ex…

  20. 7.1CVE-2026-25302EPSS 0.06%

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  21. 7.8CVE-2026-78860EPSS 0.1%

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  22. 7.9CVE-2026-77805EPSS 0.07%

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  23. 6.9CVE-2026-105161EPSS 0.1%

    A flaw has been found in invariant-systems-ai aiir up to 1.7.0. The affected element is an unknown function of the component Policy Gate Handler. Executing a manipulation can lead to improper verification of cryptographic signature. The at…

  24. 2.3CVE-2026-105118EPSS 0.1%

    OpenAM before 16.1.3 contains an open redirect vulnerability that allows unauthenticated attackers to redirect users by supplying an unverified id_token_hint to the /oauth2/connect/endSession endpoint. Attackers can name any realm client i…

  25. 7.1CVE-2026-71891EPSS 0.2%

    In Bouncy Castle for Java before 1.86, BLS12_381BasicScheme.keyValidate, and so BLSPublicKeyParameters and every BasicScheme, MessageAugmentation and ProofOfPossession verify and aggregateVerify that gate on it, accepted a public key built…

  26. 8.2CVE-2026-71887EPSS 0.09%

    In Bouncy Castle for Java before 1.86, the high-level OpenPGP API accepted a data signature made by a signing subkey whose Subkey Binding signature carried no embedded Primary Key Binding (cross-certification) signature, in the case where …

  27. 8.3CVE-2026-104437EPSS 0.2%

    Zebra before 4.4.0 contains a consensus divergence vulnerability in V5 transparent signature verification, computing a ZIP-244 digest for SIGHASH_SINGLE inputs lacking corresponding outputs instead of failing. Attackers can craft V5 transa…

  28. 8.3CVE-2026-104435EPSS 0.2%

    Zebra zebrad 4.4.0 and zebra-script 6.0.0 fail to enforce a ZIP-244 consensus rule, accepting V5 transparent inputs signed with SIGHASH_SINGLE that lack a corresponding output. Attackers can broadcast crafted V5 transactions with more inpu…

  29. 8.6CVE-2026-86326EPSS 0.2%

    An improper verification of cryptographic signature vulnerability exists in protocol gateways because the device does not properly verify the cryptographic authenticity of firmware images before installation. An attacker with high privileg…

  30. 8.7CVE-2026-63571EPSS 0.1%

    Improper verification of cryptographic signature in the attribute certificate path validator (PkixAttrCertPathValidator, also used by PkixAttrCertPathBuilder) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote attac…

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  34. 8.1CVE-2026-87004EPSS 0.3%

    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 pro…

  35. 5.9CVE-2026-55174EPSS 0.1%

    UltrafastSecp256k1 is a high-performance, multi-backend secp256k1 engine with reproducible audit evidence, compatibility shims, and profile-based review scopes. Prior to version 4.2.0, UltrafastSecp256k1's ECDSA adaptor pre-signature verif…

  36. 7.1CVE-2026-47554EPSS 0.09%

    NVIDIA GPU Display Driver for Linux contains a vulnerability in the kernel mode layer where improper verification of cryptographic signatures may cause signature verification to be bypassed under memory pressure. A successful exploit of th…

  37. 9.2CVE-2026-102508EPSS 0.2%

    Improper Verification of Cryptographic Signature and Improper Certificate Validation in the OPC UA driver of Apache PLC4X (PLC4J) allows an attacker in a network position between client and server to impersonate the OPC UA server and to re…

  38. 7.7CVE-2026-91191EPSS 0.2%

    The device's update mechanism includes conditions that allow unauthorized software packages to be accepted as authentic. During the boot process, the stock done function disables signature verification in the OPKG configuration before rest…

  39. 8.7CVE-2026-100293EPSS 0.2%

    In Anjvision YSSD‑RTMP‑H5 firmware version 3.3.2.4, both the local and cloud update mechanisms apply new firmware without any cryptographic verification, relying only on basic hashing. This design allows an attacker who can reach the updat…

  40. 7.4CVE-2026-102273EPSS 0.2%

    PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because HMAC key guard only recognizes top-level public JWK forms and misses container representations. Thi…

  41. 7.4CVE-2026-102272EPSS 0.2%

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  43. 9.1CVE-2026-102268EPSS 0.2%

    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 whe…

  44. 9.1CVE-2026-102266EPSS 0.2%

    PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, HMACAlgorithm.from_jwk is affected because PyJWK verification path used the decoded key without applying prepare_key validation. This occurs when a tru…

  45. 9.8CVE-2026-96760EPSS 0.4%

    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…

  46. 2.3CVE-2026-94418EPSS 0.1%

    Under WOLFSSL_SMALL_CERT_VERIFY, ProcessPeerCertParse() runs the certificate signature check separately from the parse to keep peak memory down, then merges the two results, but it merged the signature result back only when the parse retur…

  47. 6.9CVE-2025-71422EPSS 0.07%

    Contrast is a Kubernetes runtime for confidential containers. In versions before 1.12.1, the secure persistent volume feature is vulnerable to a malicious host supplying a crafted LUKS2 volume to a pod VM. LUKS2 volume metadata is not auth…

  48. 7.1CVE-2026-84465EPSS 0.1%

    Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, when Zammad checks the digital signature on an incoming S/MIME-signed email, it does not verify that the signing certificate is genuinely trusted, it only …

  49. 5.3CVE-2026-61855EPSS 0.2%

    Zammad is a web based open source helpdesk/customer support system. In 7.0.3 and 7.1.1, under certain conditions, Zammad's verification of inbound PGP-signed email can mark a message as carrying a valid ("Good") PGP signature from a regist…

  50. 7.1CVE-2026-56727EPSS 0.2%

    Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2, summary In Zammad's inbound PGP email processing, the return value of the gpg verification call was silently discarded. Regardless of whether gpg reported …