CVE-2026-3416

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.

Affected Software

VendorProductVersion RangeStatus
WSO2WSO2 API Manager0 < 4.1.0unknown
WSO2WSO2 API Manager4.1.0 < 4.1.0.253affected
WSO2WSO2 API Manager4.2.0 < 4.2.0.193affected
WSO2WSO2 API Manager4.3.0 < 4.3.0.104affected
WSO2WSO2 API Manager4.4.0 < 4.4.0.68affected
WSO2WSO2 API Manager4.5.0 < 4.5.0.52affected
WSO2WSO2 API Control Plane4.5.0 < 4.5.0.53affected

Weaknesses

  • CWE-330: CWE-330: Use of Insufficiently Random Values

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References