CVE-2026-3416 (GCVE-0-2026-3416)
Vulnerability from cvelistv5
Published
2026-09-03 12:35
Modified
2026-09-03 12:55
Severity ?
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-330 - Use of Insufficiently Random Values
Summary
The API Publisher component previously used a non-cryptographic pseudorandom number generator (PRNG) to create shared secrets for Webhook HMAC validation. This PRNG lacks sufficient entropy for security-sensitive operations, allowing a sophisticated attacker to predict future secrets. This enables malicious actors to forge event payloads with valid HMAC signatures, bypassing the API Gateway's authenticity verification. Successful exploitation could allow an attacker to predict shared secrets used for Webhook HMAC validation and forge event payloads with valid signatures. This may enable bypassing API Gateway authenticity checks, leading to unauthorized event injection, data manipulation, or downstream system compromise.
References
Impacted products
Vendor Product Version
WSO2 WSO2 API Manager Version: 4.1.0   < 4.1.0.253
Version: 4.2.0   < 4.2.0.193
Version: 4.3.0   < 4.3.0.104
Version: 4.4.0   < 4.4.0.68
Version: 4.5.0   < 4.5.0.52
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