Vulnerability Details CVE-2026-3416
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 19.6%
CVSS Severity
CVSS v3 Score 5.9
Products affected by CVE-2026-3416
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cpe:2.3:a:wso2:api_manager:4.1.0
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cpe:2.3:a:wso2:api_manager:4.1.0.136
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cpe:2.3:a:wso2:api_manager:4.1.0.152
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cpe:2.3:a:wso2:api_manager:4.1.0.166
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cpe:2.3:a:wso2:api_manager:4.1.0.169
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cpe:2.3:a:wso2:api_manager:4.1.0.171
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cpe:2.3:a:wso2:api_manager:4.1.0.187
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cpe:2.3:a:wso2:api_manager:4.1.0.200
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cpe:2.3:a:wso2:api_manager:4.1.0.206
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cpe:2.3:a:wso2:api_manager:4.1.0.215
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cpe:2.3:a:wso2:api_manager:4.1.0.216
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cpe:2.3:a:wso2:api_manager:4.1.0.218
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cpe:2.3:a:wso2:api_manager:4.1.0.219
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cpe:2.3:a:wso2:api_manager:4.1.0.228
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cpe:2.3:a:wso2:api_manager:4.1.0.231
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cpe:2.3:a:wso2:api_manager:4.1.0.233
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cpe:2.3:a:wso2:api_manager:4.1.0.236
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cpe:2.3:a:wso2:api_manager:4.1.0.238
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cpe:2.3:a:wso2:api_manager:4.1.0.239
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cpe:2.3:a:wso2:api_manager:4.1.0.242
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cpe:2.3:a:wso2:api_manager:4.1.0.243
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cpe:2.3:a:wso2:api_manager:4.1.0.244
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cpe:2.3:a:wso2:api_manager:4.1.0.248
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cpe:2.3:a:wso2:api_manager:4.1.0.249
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cpe:2.3:a:wso2:api_manager:4.2.0
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cpe:2.3:a:wso2:api_manager:4.2.0.100
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cpe:2.3:a:wso2:api_manager:4.2.0.108
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cpe:2.3:a:wso2:api_manager:4.2.0.127
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cpe:2.3:a:wso2:api_manager:4.2.0.138
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cpe:2.3:a:wso2:api_manager:4.2.0.144
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cpe:2.3:a:wso2:api_manager:4.2.0.150
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cpe:2.3:a:wso2:api_manager:4.2.0.153
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cpe:2.3:a:wso2:api_manager:4.2.0.156
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cpe:2.3:a:wso2:api_manager:4.2.0.157
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cpe:2.3:a:wso2:api_manager:4.2.0.164
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cpe:2.3:a:wso2:api_manager:4.2.0.169
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cpe:2.3:a:wso2:api_manager:4.2.0.171
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cpe:2.3:a:wso2:api_manager:4.2.0.173
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cpe:2.3:a:wso2:api_manager:4.2.0.176
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cpe:2.3:a:wso2:api_manager:4.2.0.178
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cpe:2.3:a:wso2:api_manager:4.2.0.179
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cpe:2.3:a:wso2:api_manager:4.2.0.182
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cpe:2.3:a:wso2:api_manager:4.2.0.183
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cpe:2.3:a:wso2:api_manager:4.2.0.184
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cpe:2.3:a:wso2:api_manager:4.2.0.188
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cpe:2.3:a:wso2:api_manager:4.2.0.189
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cpe:2.3:a:wso2:api_manager:4.2.0.80
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cpe:2.3:a:wso2:api_manager:4.3.0
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cpe:2.3:a:wso2:api_manager:4.3.0.100
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cpe:2.3:a:wso2:api_manager:4.3.0.16
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cpe:2.3:a:wso2:api_manager:4.3.0.39
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cpe:2.3:a:wso2:api_manager:4.3.0.51
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cpe:2.3:a:wso2:api_manager:4.3.0.55
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cpe:2.3:a:wso2:api_manager:4.3.0.57
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cpe:2.3:a:wso2:api_manager:4.3.0.65
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cpe:2.3:a:wso2:api_manager:4.3.0.66
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cpe:2.3:a:wso2:api_manager:4.3.0.67
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cpe:2.3:a:wso2:api_manager:4.3.0.70
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cpe:2.3:a:wso2:api_manager:4.3.0.74
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cpe:2.3:a:wso2:api_manager:4.3.0.81
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cpe:2.3:a:wso2:api_manager:4.3.0.83
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cpe:2.3:a:wso2:api_manager:4.3.0.85
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cpe:2.3:a:wso2:api_manager:4.3.0.88
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cpe:2.3:a:wso2:api_manager:4.3.0.90
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cpe:2.3:a:wso2:api_manager:4.3.0.91
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cpe:2.3:a:wso2:api_manager:4.3.0.93
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cpe:2.3:a:wso2:api_manager:4.3.0.94
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cpe:2.3:a:wso2:api_manager:4.3.0.95
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cpe:2.3:a:wso2:api_manager:4.3.0.99
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cpe:2.3:a:wso2:api_manager:4.4.0
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cpe:2.3:a:wso2:api_manager:4.4.0.28
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cpe:2.3:a:wso2:api_manager:4.4.0.29
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cpe:2.3:a:wso2:api_manager:4.4.0.30
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cpe:2.3:a:wso2:api_manager:4.4.0.33
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cpe:2.3:a:wso2:api_manager:4.4.0.38
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cpe:2.3:a:wso2:api_manager:4.4.0.45
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cpe:2.3:a:wso2:api_manager:4.4.0.47
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cpe:2.3:a:wso2:api_manager:4.4.0.49
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cpe:2.3:a:wso2:api_manager:4.4.0.52
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cpe:2.3:a:wso2:api_manager:4.4.0.54
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cpe:2.3:a:wso2:api_manager:4.4.0.55
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cpe:2.3:a:wso2:api_manager:4.4.0.57
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cpe:2.3:a:wso2:api_manager:4.4.0.58
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cpe:2.3:a:wso2:api_manager:4.4.0.59
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cpe:2.3:a:wso2:api_manager:4.4.0.63
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cpe:2.3:a:wso2:api_manager:4.4.0.64
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cpe:2.3:a:wso2:api_manager:4.5.0
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cpe:2.3:a:wso2:api_manager:4.5.0.11
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cpe:2.3:a:wso2:api_manager:4.5.0.12
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cpe:2.3:a:wso2:api_manager:4.5.0.14
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cpe:2.3:a:wso2:api_manager:4.5.0.17
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cpe:2.3:a:wso2:api_manager:4.5.0.20
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cpe:2.3:a:wso2:api_manager:4.5.0.28
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cpe:2.3:a:wso2:api_manager:4.5.0.30
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cpe:2.3:a:wso2:api_manager:4.5.0.32
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cpe:2.3:a:wso2:api_manager:4.5.0.35
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cpe:2.3:a:wso2:api_manager:4.5.0.37
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cpe:2.3:a:wso2:api_manager:4.5.0.38
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cpe:2.3:a:wso2:api_manager:4.5.0.41
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cpe:2.3:a:wso2:api_manager:4.5.0.43
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cpe:2.3:a:wso2:api_manager:4.5.0.44
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cpe:2.3:a:wso2:api_manager:4.5.0.48
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cpe:2.3:a:wso2:api_manager:4.5.0.49
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cpe:2.3:a:wso2:api_manager:4.5.0.9