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CVE-2026-3416

7.5, high

WSO2 API Manager Use of Insufficiently Random Values Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.5, high high CVSS v3.1
EPSS, next 30 days
0.4% higher than 27.9% of scored CVEs
Exploitation
No public evidence
Published
3 Sept 2026a month ago

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.

Details

Vendor
WSO2
Product
WSO2 API Manager
Weakness
CWE-330 (opens in a new tab)
Status
Analyzed
Updated
15 Sept 2026
Assigner
ed10eef1-636d-4fbe-9993-6890dfa878f8

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References 1

Patches and fixes 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other WSO2 CVEs

Every WSO2 CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-5430 WSO2 Multiple Products Path Traversal Vulnerability KEV EPSS 0.6% 10, critical
  • CVE-2022-29464 WSO2 Multiple Products Unrestrictive Upload of File Vulnerability KEV EPSS 100% 9.8, critical

Beyond this page

Is CVE-2026-3416 in your network?

This page tells you how dangerous CVE-2026-3416 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.