CVE WatchSep 3, 2026

CVE-2026-3416

The API Publisher component previously used a non-cryptographic pseudorandom number generator (PRNG) to create shared secrets for Webhook HM

CVSS

5.9

Medium

EPSS

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KEV

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Exploit Today

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0-100

Published: Sep 3, 2026 · Last modified: Sep 3, 2026 · CWE-330

EPSS · 30d

Not enough EPSS history yet.

Technical description

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.

Official references

security.docs.wso2.comhttps://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5174/

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