CWE-347

Improper Verification of Cryptographic Signature

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

CVE-2026-33746 (GCVE-0-2026-33746)

Vulnerability from cvelistv5 – Published: 2026-04-02 15:06 – Updated: 2026-04-02 18:50
VLAI
Title
Convoy: JWT Signature Verification Bypass Allows Authentication as Arbitrary Users
Summary
Convoy is a KVM server management panel for hosting businesses. From version 3.9.0-beta to before version 4.5.1, the JWTService::decode() method did not verify the cryptographic signature of JWT tokens. While the method configured a symmetric HMAC-SHA256 signer via lcobucci/jwt, it only validated time-based claims (exp, nbf, iat) using the StrictValidAt constraint. The SignedWith constraint was not included in the validation step. This means an attacker could forge or tamper with JWT token payloads — such as modifying the user_uuid claim — and the token would be accepted as valid, as long as the time-based claims were satisfied. This directly impacts the SSO authentication flow (LoginController::authorizeToken), allowing an attacker to authenticate as any user by crafting a token with an arbitrary user_uuid. This issue has been patched in version 4.5.1.
CWE
  • CWE-287 - Improper Authentication
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
ConvoyPanel panel Affected: >= 3.9.0-beta, < 4.5.1
Create a notification for this product.
Show details on NVD website

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CVE-2026-33894 (GCVE-0-2026-33894)

Vulnerability from cvelistv5 – Published: 2026-03-27 20:45 – Updated: 2026-03-31 14:05
VLAI
Title
Forge has signature forgery in RSA-PKCS due to ASN.1 extra field
Summary
Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.4.0, RSASSA PKCS#1 v1.5 signature verification accepts forged signatures for low public exponent keys (e=3). Attackers can forge signatures by stuffing “garbage” bytes within the ASN structure in order to construct a signature that passes verification, enabling Bleichenbacher style forgery. This issue is similar to CVE-2022-24771, but adds bytes in an addition field within the ASN structure, rather than outside of it. Additionally, forge does not validate that signatures include a minimum of 8 bytes of padding as defined by the specification, providing attackers additional space to construct Bleichenbacher forgeries. Version 1.4.0 patches the issue.
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
  • CWE-20 - Improper Input Validation
Assigner
Impacted products
Vendor Product Version
digitalbazaar forge Affected: < 1.4.0
Create a notification for this product.
Show details on NVD website

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CVE-2026-33895 (GCVE-0-2026-33895)

Vulnerability from cvelistv5 – Published: 2026-03-27 20:47 – Updated: 2026-03-31 19:10
VLAI
Title
Forge has signature forgery in Ed25519 due to missing S > L check
Summary
Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.4.0, Ed25519 signature verification accepts forged non-canonical signatures where the scalar S is not reduced modulo the group order (`S >= L`). A valid signature and its `S + L` variant both verify in forge, while Node.js `crypto.verify` (OpenSSL-backed) rejects the `S + L` variant, as defined by the specification. This class of signature malleability has been exploited in practice to bypass authentication and authorization logic (see CVE-2026-25793, CVE-2022-35961). Applications relying on signature uniqueness (i.e., dedup by signature bytes, replay tracking, signed-object canonicalization checks) may be bypassed. Version 1.4.0 patches the issue.
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
Impacted products
Vendor Product Version
digitalbazaar forge Affected: < 1.4.0
Create a notification for this product.
Show details on NVD website

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CVE-2026-34068 (GCVE-0-2026-34068)

Vulnerability from cvelistv5 – Published: 2026-04-22 19:55 – Updated: 2026-04-23 12:56
VLAI
Title
nimiq-transaction: UpdateValidator transactions allows voting key change without proof-of-knowledge
Summary
nimiq-transaction provides the transaction primitive to be used in Nimiq's Rust implementation. Prior to version 1.3.0, the staking contract accepts `UpdateValidator` transactions that set `new_voting_key=Some(...)` while omitting `new_proof_of_knowledge`. this skips the proof-of-knowledge requirement that is needed to prevent BLS rogue-key attacks when public keys are aggregated. Because tendermint macro block justification verification aggregates validator voting keys and verifies a single aggregated BLS signature against that aggregate public key, a rogue-key voting key in the validator set can allow an attacker to forge a quorum-looking justification while only producing a single signature. While the impact is critical, the exploitability is low: The voting keys are fixed for the epoch, so the attacker would need to know the next epoch validator set (chosen through VRF), which is unlikely. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available.
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
Impacted products
Vendor Product Version
nimiq nimiq-transaction Affected: < 1.3.0
Create a notification for this product.
Show details on NVD website

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CVE-2026-34155 (GCVE-0-2026-34155)

Vulnerability from cvelistv5 – Published: 2026-03-31 13:28 – Updated: 2026-03-31 15:45
VLAI
Title
RAUC: Improper Signing of Plain Bundles Exceeding 2 GiB
Summary
RAUC controls the update process on embedded Linux systems. Prior to version 1.15.2, RAUC bundles using the 'plain' format exceeding a payload size of 2 GiB cause an integer overflow which results in a signature which covers only the first few bytes of the payload. Given such a bundle with a legitimate signature, an attacker can modify the part of the payload which is not covered by the signature. This issue has been patched in version 1.15.2.
CWE
  • CWE-196 - Unsigned to Signed Conversion Error
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
Impacted products
Vendor Product Version
rauc rauc Affected: < 1.15.2
Create a notification for this product.
Show details on NVD website

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CVE-2026-34240 (GCVE-0-2026-34240)

Vulnerability from cvelistv5 – Published: 2026-03-31 15:44 – Updated: 2026-04-01 14:03
VLAI
Title
jose vulnerable to untrusted JWK header key acceptance during signature verification
Summary
JOSE is a Javascript Object Signing and Encryption (JOSE) library. Prior to version 0.3.5+1, a vulnerability in jose could allow an unauthenticated, remote attacker to forge valid JWS/JWT tokens by using a key embedded in the JOSE header (jwk). The vulnerability exists because key selection could treat header-provided jwk as a verification candidate even when that key was not present in the trusted key store. Since JOSE headers are untrusted input, an attacker could exploit this by creating a token payload, embedding an attacker-controlled public key in the header, and signing with the matching private key. Applications using affected versions for token verification are impacted. This issue has been patched in version 0.3.5+1. A workaround for this issue involves rejecting tokens where header jwk is present unless that jwk matches a key already present in the application's trusted key store.
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
appsup-dart jose Affected: < 0.3.5+1
Create a notification for this product.
Show details on NVD website

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CVE-2026-34377 (GCVE-0-2026-34377)

Vulnerability from cvelistv5 – Published: 2026-03-31 14:05 – Updated: 2026-03-31 17:18
VLAI
Title
Zebra has a Consensus Failure due to Improper Verification of V5 Transactions
Summary
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-consensus version 5.0.1, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By matching a valid transaction's txid while providing invalid authorization data, a miner could cause vulnerable Zebra nodes to accept an invalid block, leading to a consensus split from the rest of the Zcash network. This would not allow invalid transactions to be accepted but could result in a consensus split between vulnerable Zebra nodes and invulnerable Zebra and Zcashd nodes. This issue has been patched in zebrad version 4.3.0 and zebra-consensus version 5.0.1.
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
Impacted products
Show details on NVD website

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CVE-2026-34840 (GCVE-0-2026-34840)

Vulnerability from cvelistv5 – Published: 2026-04-02 18:52 – Updated: 2026-04-02 20:20
VLAI
Title
OneUptime SSO: Multi-Assertion Identity Injection via Decoupled Signature Verification
Summary
OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.42, OneUptime's SAML SSO implementation (App/FeatureSet/Identity/Utils/SSO.ts) has decoupled signature verification and identity extraction. isSignatureValid() verifies the first <Signature> element in the XML DOM using xml-crypto, while getEmail() always reads from assertion[0] via xml2js. An attacker can prepend an unsigned assertion containing an arbitrary identity before a legitimately signed assertion, resulting in authentication bypass. This issue has been patched in version 10.0.42.
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
Impacted products
Vendor Product Version
OneUptime oneuptime Affected: < 10.0.42
Create a notification for this product.
Show details on NVD website

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CVE-2026-3562 (GCVE-0-2026-3562)

Vulnerability from cvelistv5 – Published: 2026-03-13 20:37 – Updated: 2026-03-16 20:21
VLAI
Title
Philips Hue Bridge hk_hap Ed25519 Signature Verification Authentication Bypass Vulnerability
Summary
Philips Hue Bridge hk_hap Ed25519 Signature Verification Authentication Bypass Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Philips Hue Bridge. Authentication is not required to exploit this vulnerability. The specific flaw exists within the ed25519_sign_open function. The issue results from improper verification of a cryptographic signature. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-28480.
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
zdi
References
Impacted products
Vendor Product Version
Philips Hue Bridge Affected: 1.73.1973146020
Create a notification for this product.
Date Public
2026-03-06 21:19
Show details on NVD website

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CVE-2026-3564 (GCVE-0-2026-3564)

Vulnerability from cvelistv5 – Published: 2026-03-17 14:48 – Updated: 2026-03-18 03:55
VLAI
Title
ScreenConnect Instance Level Cryptographic Material Exposure
Summary
A condition in ScreenConnect may allow an actor with access to server-level cryptographic material used for authentication to obtain unauthorized access, including elevated privileges, in certain scenarios.
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
Impacted products
Vendor Product Version
ConnectWise ScreenConnect Affected: All versions prior to 26.1
Create a notification for this product.
Show details on NVD website

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No mitigation information available for this CWE.

CAPEC-463: Padding Oracle Crypto Attack

An adversary is able to efficiently decrypt data without knowing the decryption key if a target system leaks data on whether or not a padding error happened while decrypting the ciphertext. A target system that leaks this type of information becomes the padding oracle and an adversary is able to make use of that oracle to efficiently decrypt data without knowing the decryption key by issuing on average 128*b calls to the padding oracle (where b is the number of bytes in the ciphertext block). In addition to performing decryption, an adversary is also able to produce valid ciphertexts (i.e., perform encryption) by using the padding oracle, all without knowing the encryption key.

CAPEC-475: Signature Spoofing by Improper Validation

An adversary exploits a cryptographic weakness in the signature verification algorithm implementation to generate a valid signature without knowing the key.

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