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.
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Vendor Solution
Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5174/#solution
Tracking
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Thu, 03 Sep 2026 13:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Thu, 03 Sep 2026 12:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Predictable Pseudorandom Number Generation via Webhook HMAC Secret Generation in Multiple WSO2 Products Allows Forged Event Payloads | |
| First Time appeared |
Wso2
Wso2 wso2 Api Control Plane Wso2 wso2 Api Manager |
|
| Weaknesses | CWE-330 | |
| CPEs | cpe:2.3:a:wso2:wso2_api_control_plane:*:*:*:*:*:*:*:* cpe:2.3:a:wso2:wso2_api_manager:*:*:*:*:*:*:*:* |
|
| Vendors & Products |
Wso2
Wso2 wso2 Api Control Plane Wso2 wso2 Api Manager |
|
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: WSO2
Published:
Updated: 2026-09-03T12:55:15.634Z
Reserved: 2026-03-01T18:48:54.097Z
Link: CVE-2026-3416
Updated: 2026-09-03T12:55:12.524Z
Status : Received
Published: 2026-09-03T13:05:37.847
Modified: 2026-09-03T13:05:37.847
Link: CVE-2026-3416
No data.
OpenCVE Enrichment
Updated: 2026-09-03T13:30:04Z