{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-54430", "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "state": "PUBLISHED", "assignerShortName": "CERT-PL", "dateReserved": "2026-06-15T13:08:01.056Z", "datePublished": "2026-07-02T10:30:33.766Z", "dateUpdated": "2026-07-02T12:17:21.724Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "shortName": "CERT-PL", "dateUpdated": "2026-07-02T10:45:00.888Z"}, "title": "Server-Site Request Forgery in liboauth2", "datePublic": "2026-07-02T00:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-918", "description": "CWE-918 Server-Side Request Forgery (SSRF)", "type": "CWE"}]}], "affected": [{"vendor": "OpenIDC", "product": "liboauth2", "repo": "https://github.com/OpenIDC/liboauth2", "modules": ["oauth2_jose_jwks_aws_alb_resolve()"], "programFiles": ["src/jose.c"], "versions": [{"status": "affected", "version": "0", "lessThan": "2.3.0", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "liboauth2 is vulnerable to Server-Side Request Forgery in\u00a0oauth2_jose_jwks_aws_alb_resolve() function.\u00a0The AWS ALB verifier reads both signer and kid from the unverified JWT\nheader. If signer matches the configured ARN, kid is appended to\nalb_base_url without URL encoding or path sanitization, and the HTTP GET\nis issued before signature verification. This allows an attacker to force\nthe server to send a GET request to an attacker-chosen internal path.\n\nThis issue was fixed in version 2.3.0", "supportingMedia": [{"type": "text/html", "base64": false, "value": "liboauth2 is vulnerable to Server-Side Request Forgery in&nbsp;oauth2_jose_jwks_aws_alb_resolve() function.&nbsp;The AWS ALB verifier reads both signer and kid from the unverified JWT\nheader. If signer matches the configured ARN, kid is appended to\nalb_base_url without URL encoding or path sanitization, and the HTTP GET\nis issued before signature verification. This allows an attacker to force\nthe server to send a GET request to an attacker-chosen internal path.<br><br>This issue was fixed in version 2.3.0"}]}], "tags": ["x_open-source"], "references": [{"url": "https://cert.pl/en/posts/2026/07/CVE-2026-54430", "tags": ["third-party-advisory"]}, {"url": "https://github.com/OpenIDC/liboauth2", "tags": ["product"]}, {"url": "https://github.com/OpenIDC/liboauth2/commit/347507ac5b51f48c2933bbe49b2ee07c2af4712b", "tags": ["issue-tracking"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 5.1, "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N"}}], "credits": [{"lang": "en", "value": "Micha\u0142 Majchrowicz (AFINE Team)", "type": "finder"}, {"lang": "en", "value": "Marcin Wyczechowski (AFINE Team)", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-02T12:17:15.414798Z", "id": "CVE-2026-54430", "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": "2026-07-02T12:17:21.724Z"}}]}}

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