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CVE-2026-3416— Predictable Pseudorandom Number Generation via Webhook HMAC Secret Generation in Multiple WSO2 Products Allows Forged Event Payloads

Quick assessment

Affected
WSO2 WSO2 API Manager
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WSO2 API Manager是美国WSO2公司的一款API管理平台。 WSO2 API Manager 4.1.0.253版本之前的4.1.0.x版本、4.2.0.193版本之前的4.2.0.x版本、4.3.0.104版本之前的4.3.0.x版本、4.4.0.68版本之前的4.4.0.x版本、4.5.0.52版本之前的4.5.0.x版本和WSO2 API Control Plane 4.5.0.53版本之前的4.5.0.x版本存在加密问题漏洞，该漏洞源于API Publisher组件使用非加密伪随机数

CVSS 5.9 · Medium EPSS 0.27% · P19

Possible ATT&CK Techniques 1 AI

T1567 · Exfiltration Over Web Service

Affected Version Matrix 7

VendorProduct Version RangeStatus
WSO2 WSO2 API Control Plane 4.5.0< 4.5.0.53 affected
WSO2 WSO2 API Manager < 4.1.0 unknown
4.1.0< 4.1.0.253 affected
4.2.0< 4.2.0.193 affected
4.3.0< 4.3.0.104 affected
4.4.0< 4.4.0.68 affected
4.5.0< 4.5.0.52 affected
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I. Basic Information for CVE-2026-3416

Vulnerability Information
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Vulnerability Title
Predictable Pseudorandom Number Generation via Webhook HMAC Secret Generation in Multiple WSO2 Products Allows Forged Event Payloads
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不充分的随机数
Source: CVE Program / CVE List V5
Vulnerability Title
WSO2 API Manager 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WSO2 API Manager是美国WSO2公司的一款API管理平台。 WSO2 API Manager 4.1.0.253版本之前的4.1.0.x版本、4.2.0.193版本之前的4.2.0.x版本、4.3.0.104版本之前的4.3.0.x版本、4.4.0.68版本之前的4.4.0.x版本、4.5.0.52版本之前的4.5.0.x版本和WSO2 API Control Plane 4.5.0.53版本之前的4.5.0.x版本存在加密问题漏洞，该漏洞源于API Publisher组件使用非加密伪随机数
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
WSO2 WSO2 API Manager 4.1.0 ~ 4.1.0.253 -
WSO2 WSO2 API Control Plane 4.5.0 ~ 4.5.0.53 -

II. Public POCs for CVE-2026-3416

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III. Intelligence Information for CVE-2026-3416

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Vendor Advisories for CVE-2026-3416 (1)

IV. Related Vulnerabilities

Same product: WSO2 API Manager
Same vendor: WSO2
Same weakness: CWE-330

V. Comments for CVE-2026-3416

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