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TI-2026-02950 Aliases CVE-2026-3416GHSA-x3mw-fvm5-jwf4

Predictable Pseudorandom Number Generation via Webhook HMAC Secret Generation in Multiple…

Priority LOW 33CWE-330Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00358 29th percentileScored 2026-11-07
Fix Fixed WSO2 API Manager (WSO2): 4.1.0.253, 4.2.0.193, 4.3.0.104 +2WSO2 API Control Plane (WSO2): 4.5.0.53

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
WSO2WSO2 API Manager4.1.0 to before 4.1.0.253; 4.2.0 to before 4.2.0.193; 4.3.0 to before 4.3.0.104; 4.4.0 to before 4.4.0.68; 4.5.0 to before 4.5.0.524.1.0.253, 4.2.0.193, 4.3.0.104, 4.4.0.68, 4.5.0.52Patch availableCNA
WSO2WSO2 API Control Plane4.5.0 to before 4.5.0.534.5.0.53Patch availableCNA
  • WSO2 API Manager VendorWSO2 Affected 4.1.0 to before 4.1.0.253; 4.2.0 to before 4.2.0.193; 4.3.0 to before 4.3.0.104; 4.4.0 to before 4.4.0.68; 4.5.0 to before 4.5.0.52 Fixed in 4.1.0.253, 4.2.0.193, 4.3.0.104, 4.4.0.68, 4.5.0.52 Patch available CNA
  • WSO2 API Control Plane VendorWSO2 Affected 4.5.0 to before 4.5.0.53 Fixed in 4.5.0.53 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:wso2:api_control_plane:*:*:*:*:*:*:*:*4.5.0 to before 4.5.0.53VulnerableWSO2
cpe:2.3:a:wso2:api_manager:*:*:*:*:*:*:*:*4.1.0 to before 4.1.0.253; 4.2.0 to before 4.2.0.193; 4.3.0 to before 4.3.0.104; 4.4.0 to before 4.4.0.68; 4.5.0 to before 4.5.0.52VulnerableWSO2
  • cpe:2.3:a:wso2:api_control_plane:*:*:*:*:*:*:*:* Versions 4.5.0 to before 4.5.0.53 Vulnerable ·WSO2
  • cpe:2.3:a:wso2:api_manager:*:*:*:*:*:*:*:* Versions 4.1.0 to before 4.1.0.253; 4.2.0 to before 4.2.0.193; 4.3.0 to before 4.3.0.104; 4.4.0 to before 4.4.0.68; 4.5.0 to before 4.5.0.52 Vulnerable ·WSO2

Remediation

  • Fix · CNA WSO2 API Manager (WSO2) Fixed in 4.1.0.253, 4.2.0.193, 4.3.0.104, 4.4.0.68, 4.5.0.52
  • Fix · CNA WSO2 API Control Plane (WSO2) Fixed in 4.5.0.53

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-3416
  2. 2026-10-03 Alias added: GHSA-x3mw-fvm5-jwf4

References

Patch 1

  • TI-2026-04755 Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account Takeover KEVCVSS 3.1CRITICAL 10.0
  • TI-2025-13722 Account Takeover via Conditional Authentication Script Logic in Multiple WSO2 Products CVSS 3.1CRITICAL 9.4
  • TI-2025-09712 Potential Broken Access Control in Multiple WSO2 Products via System REST APIs CVSS 3.1CRITICAL 9.8
  • TI-2025-08391 Improper Privilege Management in Multiple WSO2 API Manager via keymanager-operations DCR Endpoint CVSS 3.1CRITICAL 9.8
  • TI-2026-01411 Privilege Escalation via System REST APIs in Multiple WSO2 Products Permits Admin Account Takeover CVSS 3.1CRITICAL 9.8
  • TI-2025-08536 Improper Certificate-Based Authentication Enforcement in Multiple WSO2 Products CVSS 3.1CRITICAL 9.8
See all 30 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences