{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-3416", "assignerOrgId": "ed10eef1-636d-4fbe-9993-6890dfa878f8", "state": "PUBLISHED", "assignerShortName": "WSO2", "dateReserved": "2026-03-01T18:48:54.097Z", "datePublished": "2026-09-03T12:35:32.628Z", "dateUpdated": "2026-09-03T12:55:15.634Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "ed10eef1-636d-4fbe-9993-6890dfa878f8", "shortName": "WSO2", "dateUpdated": "2026-09-03T12:35:32.628Z"}, "title": "Predictable Pseudorandom Number Generation via Webhook HMAC Secret Generation in Multiple WSO2 Products Allows Forged Event Payloads", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-330", "description": "CWE-330: Use of Insufficiently Random Values", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-109", "descriptions": [{"lang": "en", "value": "CAPEC-109 CAPEC-109: Predictable Pseudorandom Number Generator"}]}], "affected": [{"vendor": "WSO2", "product": "WSO2 API Manager", "versions": [{"status": "unknown", "version": "0", "lessThan": "4.1.0", "versionType": "custom"}, {"status": "affected", "version": "4.1.0", "lessThan": "4.1.0.253", "versionType": "custom"}, {"status": "affected", "version": "4.2.0", "lessThan": "4.2.0.193", "versionType": "custom"}, {"status": "affected", "version": "4.3.0", "lessThan": "4.3.0.104", "versionType": "custom"}, {"status": "affected", "version": "4.4.0", "lessThan": "4.4.0.68", "versionType": "custom"}, {"status": "affected", "version": "4.5.0", "lessThan": "4.5.0.52", "versionType": "custom"}], "defaultStatus": "unaffected"}, {"vendor": "WSO2", "product": "WSO2 API Control Plane", "versions": [{"status": "affected", "version": "4.5.0", "lessThan": "4.5.0.53", "versionType": "custom"}], "defaultStatus": "unaffected"}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:wso2:wso2_api_manager:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1.0", "versionEndExcluding": "4.1.0.253"}, {"vulnerable": true, "criteria": "cpe:2.3:a:wso2:wso2_api_manager:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.2.0", "versionEndExcluding": "4.2.0.193"}, {"vulnerable": true, "criteria": "cpe:2.3:a:wso2:wso2_api_manager:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.3.0", "versionEndExcluding": "4.3.0.104"}, {"vulnerable": true, "criteria": "cpe:2.3:a:wso2:wso2_api_manager:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4.0", "versionEndExcluding": "4.4.0.68"}, {"vulnerable": true, "criteria": "cpe:2.3:a:wso2:wso2_api_manager:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5.0", "versionEndExcluding": "4.5.0.52"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:wso2:wso2_api_control_plane:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5.0", "versionEndExcluding": "4.5.0.53"}]}]}], "descriptions": [{"lang": "en", "value": "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.\n\nSuccessful 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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "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.\n\nSuccessful 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."}]}], "references": [{"url": "https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5174/", "tags": ["vendor-advisory"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE", "baseSeverity": "MEDIUM", "baseScore": 5.9, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"}}], "solutions": [{"lang": "en", "value": "Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5174/#solution", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<span style=\"background-color: transparent;\">Follow the instructions given on </span><a target=\"_blank\" rel=\"nofollow\" href=\"https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5174/#solution\"><span style=\"background-color: transparent;\">https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5174/#solution</span></a> <br>"}]}], "source": {"advisory": "WSO2-2026-5174", "discovery": "INTERNAL"}, "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-03T12:55:07.421469Z", "id": "CVE-2026-3416", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-03T12:55:15.634Z"}}]}}

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