{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-121821", "assignerOrgId": "657f3255-0560-4aed-82e4-7f579ec6acfb", "state": "PUBLISHED", "assignerShortName": "LY-Corporation", "dateReserved": "2026-11-04T05:50:04.721Z", "datePublished": "2026-11-06T07:46:50.787Z", "dateUpdated": "2026-11-06T07:46:50.787Z"}, "containers": {"cna": {"affected": [{"vendor": "LY Corporation", "product": "Armeria", "defaultStatus": "unaffected", "versions": [{"version": "0.84.0", "status": "affected", "versionType": "custom", "lessThan": "1.43.0"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-942"}]}], "descriptions": [{"lang": "en", "value": "A vulnerability has been identified in armeria versions 0.84.0 through 1.42.0, where any-origin CORS policies do not enforce configured path restrictions, allowing an attacker-controlled website visited by an authenticated victim to read sensitive responses from excluded paths when credentials are enabled and the victim's browser sends authentication credentials."}], "references": [{"url": "https://line.github.io/security-advisory-blog/CVE-2026-121821/"}, {"url": "https://github.com/line/armeria/security/advisories/GHSA-386q-mrg6-jfj8"}], "metrics": [{"cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N", "baseScore": 5.3, "baseSeverity": "MEDIUM"}}], "providerMetadata": {"orgId": "657f3255-0560-4aed-82e4-7f579ec6acfb", "shortName": "LY-Corporation", "dateUpdated": "2026-11-06T07:46:50.787Z"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Armeria", "vendor": "LY Corporation", "versions": [{"lessThan": "1.43.0", "status": "affected", "version": "0.84.0", "versionType": "custom"}]}], "source": "dl_cve@linecorp.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability has been identified in armeria versions 0.84.0 through 1.42.0, where any-origin CORS policies do not enforce configured path restrictions, allowing an attacker-controlled website visited by an authenticated victim to read sensitive responses from excluded paths when credentials are enabled and the victim's browser sends authentication credentials."}], "id": "CVE-2026-121821", "lastModified": "2026-11-06T08:17:20.577", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "dl_cve@linecorp.com", "type": "Secondary"}]}, "published": "2026-11-06T08:17:20.577", "references": [{"source": "dl_cve@linecorp.com", "url": "https://github.com/line/armeria/security/advisories/GHSA-386q-mrg6-jfj8"}, {"source": "dl_cve@linecorp.com", "url": "https://line.github.io/security-advisory-blog/CVE-2026-121821/"}], "sourceIdentifier": "dl_cve@linecorp.com", "vulnStatus": "Received"}

{}

{"created": "2026-11-06T09:30:08.595673+00:00", "title": "CORS Policy Bypass Enables Credentialed Data Disclosure in Armeria", "updated": "2026-11-06T09:30:08.595678+00:00", "vendors": [], "weaknesses": ["CWE-200", "CWE-284"]}