Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Wso2 | Api Control Plane | >= 4.5.0, < 4.5.0.53 |
| Wso2 | Api Manager | >= 4.1.0, < 4.1.0.253 |
Related Weaknesses (CWE)
References
- https://security.docs.wso2.com/en/latest/security-announcements/security-advisorPatchVendor Advisory
FAQ
What is CVE-2026-3416?
CVE-2026-3416 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 securi...
How severe is CVE-2026-3416?
CVE-2026-3416 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-3416?
Check the references section above for vendor advisories and patch information. Affected products include: Wso2 Api Control Plane, Wso2 Api Manager.