Common Weakness Enumeration

CWE-347

Allowed

Improper Verification of Cryptographic Signature

Abstraction: Base · Status: Draft

API response cwe.mitre.org

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

1140 vulnerabilities reference this CWE, most recent first.

CVE-2026-46349 (GCVE-0-2026-46349)

Vulnerability from cvelistv5 – Published: 2026-06-24 19:40 – Updated: 2026-06-25 13:16
VLAI
Title
Mastodon: LD-Signature Bypass via JSON-LD Named-Graph Restructuring
Summary
Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.5.10, 4.4.17, and 4.3.23, Mastodon's normalization of incoming activities signed with Linked-Data Signatures does not sufficiently protect the activities from a certain class of spoofing, allowing attackers to re-arrange a valid signed JSON-LD activity from a third-party actor to have it processed differently. This vulnerability is fixed in 4.5.10, 4.4.17, and 4.3.23.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
mastodon mastodon Affected: >= 4.5.0-beta.1, < 4.5.10
Create a notification for this product.
Show details on NVD website
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CVE-2026-45795 (GCVE-0-2026-45795)

Vulnerability from cvelistv5 – Published: 2026-07-16 16:35 – Updated: 2026-07-16 18:06
VLAI
Title
Janssen Project: JWE Request Object Signature Verification Bypass in jans-auth-server
Summary
The Janssen Project is an open-source identity and access management (IAM) platform. Prior to 2.0.0, jans-auth-server accepts unsigned JWE request objects because JwtAuthorizationRequest skips inner signature validation when jwe.getSignedJWTPayload() returns null, and AuthzRequestService.processRequestObject() does not reject the unrecognized RSA-OAEP algorithm when forceSignedRequestObject=true. This issue is fixed in version 2.0.0.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
JanssenProject jans Affected: < 2.0.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-45755 (GCVE-0-2026-45755)

Vulnerability from cvelistv5 – Published: 2026-07-14 18:56 – Updated: 2026-07-14 19:46
VLAI
Title
Symfony: Mailtrap Mailer Webhook Parser Never Verifies the X-Mt-Signature HMAC — Unauthenticated Webhook Event Injection
Summary
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 7.4.12 and 8.0.12, MailtrapRequestParser::doParse() received the configured webhook secret but ignored the X-Mt-Signature HMAC header, allowing unauthenticated POST requests to inject forged Mailtrap delivery, bounce, open, click, or spam events. This issue is fixed in versions 7.4.12 and 8.0.12.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-306 - Missing Authentication for Critical Function
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
symfony symfony Affected: >= 7.2.0, < 7.4.12
Affected: >= 8.0.0-BETA1, < 8.0.12
Create a notification for this product.
/mailtrap-mailer mailtrap-mailer Affected: >= 7.2.0, < 7.4.12
Affected: >= 8.0.0-BETA1, < 8.0.12
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-45614 (GCVE-0-2026-45614)

Vulnerability from cvelistv5 – Published: 2026-06-03 17:53 – Updated: 2026-06-03 19:29
VLAI
Title
OP-TEE vulnerable to ECDH private key recovery
Summary
OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on Arm; Cortex-A cores using the TrustZone technology. Prior to version 4.11.0, on many of the ECDH shared secret paths, the public key isn't verified to be a point on the correct curve. By passing approximately 30-40 crafted public keys to OP-TEE, the private key can be reconstructed by a normal world attacker. When calling TEE_DeriveKey the public key is provided with full X and Y values, but the (X, Y) point might not satisfy the `Y^2 == X^3 + aX + b mod P` math for the specific curve that is used. When those public keys aren't rejected, the attacker can select public keys such that each DeriveKey call will leak `d % r` where `d` is the private key and `r` comes from the relationship between the correct curve and the attacker selected curve. With enough leaked data the Chinese remainder theorem can be used to recover the full private key. Version 4.11.0 fixes the issue.
Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
OP-TEE optee_os Affected: < 4.11.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-45575 (GCVE-0-2026-45575)

Vulnerability from cvelistv5 – Published: 2026-05-26 21:01 – Updated: 2026-05-28 14:11
VLAI
Title
epa4all-client: Improper Verification of Cryptographic Signature
Summary
epa4all-client is the Java Client for epa4all / ePA 3.0 in the Telematik Infrastruktur. Prior to 1.2.2, an attacker who can MITM the TLS connection between the client and the IDP (within the TI network) can substitute a forged discovery document. The forged document redirects uri_puk_idp_enc and uri_puk_idp_sig to attacker-controlled URLs. The client then encrypts the SMC-B-signed challenge response to the attacker's encryption key and POSTs it to the attacker's auth endpoint. This captures the signed authentication material. This vulnerability is fixed in 1.2.2.
Severity
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Show details on NVD website
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CVE-2026-44748 (GCVE-0-2026-44748)

Vulnerability from cvelistv5 – Published: 2026-06-09 00:20 – Updated: 2026-06-09 13:03
VLAI
Title
XML Signature Wrapping in SAML Authentication in SAP NetWeaver AS ABAP and ABAP Platform
Summary
SAP NetWeaver Application Server ABAP and ABAP Platform allows an authenticated attacker with normal privileges to obtain a valid signed message and send modified signed XML documents to the verifier. This may result in acceptance of tampered identity information leading to unauthorized access to sensitive user data and potential disruption of normal system usage. This causes a high impact on confidentiality, integrity and availability of the application.
Severity
9.9 (Critical)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
sap
References
Impacted products
Vendor Product Version
SAP_SE SAP NetWeaver AS ABAP and ABAP Platform Affected: SAP_BASIS 702
Affected: SAP_BASIS 731
Affected: SAP_BASIS 740
Affected: SAP_BASIS 750
Affected: SAP_BASIS 751
Affected: SAP_BASIS 752
Affected: SAP_BASIS 753
Affected: SAP_BASIS 754
Affected: SAP_BASIS 755
Affected: SAP_BASIS 756
Affected: SAP_BASIS 757
Affected: SAP_BASIS 758
Affected: SAP_BASIS 816
Affected: SAP_BASIS 918
Affected: SAP_BASIS 919
Create a notification for this product.
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CVE-2026-44720 (GCVE-0-2026-44720)

Vulnerability from cvelistv5 – Published: 2026-05-27 21:02 – Updated: 2026-06-02 18:09
VLAI
Title
OpenLearnX: Critical Authentication Bypass via JWT Signature Verification Disabled Leading to Account Takeover
Summary
OpenLearnX is an open-source, decentralized learning and assessment platform. Prior to 2.0.4, a critical authentication vulnerability was identified in OpenLearnX that could allow unauthorized access to user accounts under specific conditions. This vulnerability is fixed in 2.0.4.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-287 - Improper Authentication
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
th30d4y OpenLearnX Affected: < 2.0.4
Create a notification for this product.
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CVE-2026-44714 (GCVE-0-2026-44714)

Vulnerability from cvelistv5 – Published: 2026-05-15 16:51 – Updated: 2026-05-16 01:13
VLAI
Title
bitcoinj: ScriptExecution P2PKH/P2WPKH Verification Bypass
Summary
The bitcoinj library is a Java implementation of the Bitcoin protocol. Prior to 0.17.1, ScriptExecution.correctlySpends() contains two fast-path verification bugs for standard P2PKH and native P2WPKH spends in core/src/main/java/org/bitcoinj/script/ScriptExecution.java. In both branches, bitcoinj verifies an attacker-controlled signature/public-key pair but fails to verify that the public key is the one committed to by the output being spent. As a result, any attacker keypair can satisfy bitcoinj's local verification for arbitrary P2PKH and P2WPKH outputs. This vulnerability is fixed in 0.17.1.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
bitcoinj bitcoinj Affected: < 0.17.1
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CVE-2026-44699 (GCVE-0-2026-44699)

Vulnerability from cvelistv5 – Published: 2026-05-15 16:08 – Updated: 2026-05-15 18:04
VLAI
Title
LibJWT: Algorithm confusion allows JWT forgery with RSA JWK as empty-key HMAC
Summary
LibJWT is a C JSON Web Token Library. From 3.0.0 to 3.3.2, libjwt accepts an RSA JWK that does not contain an alg parameter as the verification key for an HS256/HS384/HS512 token. In the OpenSSL backend, this causes HMAC verification to run with a zero-length key, so an attacker can forge a valid JWT without knowing any secret or RSA private key. This is an algorithm-confusion authentication bypass. It affects applications that load RSA keys from JWKS where alg is omitted, which is valid JWK syntax and common in real deployments, and then choose the verification algorithm from the JWT header, for example in a kid lookup callback. This vulnerability is fixed in 3.3.3.
Severity
9.1 (Critical)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-327 - Use of a Broken or Risky Cryptographic Algorithm
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
benmcollins libjwt Affected: >= 3.0.0, < 3.3.3
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CVE-2026-44497 (GCVE-0-2026-44497)

Vulnerability from cvelistv5 – Published: 2026-05-08 15:08 – Updated: 2026-05-08 15:48
VLAI
Title
ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type Handling due to Stale Buffer
Summary
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.4.0 and prior to zebra-script version 6.0.0, the fix for CVE-2026-41583 introduced a separate issue due to insufficient error handling of the case where the sighash type is invalid, during sighash computation. Instead of returning an error, the normal flow would resume, and the input sighash buffer would be left untouched. In scenarios where a previous signature validation could leave a valid sighash in the buffer, an invalid hash-type could be incorrectly accepted, which would create a consensus split between Zebra and zcashd nodes. This issue has been patched in zebrad version 4.4.0 and zebra-script version 6.0.0.
Severity
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
ZcashFoundation zebra Affected: zebra-script < 6.0.0
Affected: zebrad < 4.4.0
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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