CVE-2026-82755

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When the tenant is derived from something other than the URL (a header or the <code>Host</code>) and a shared cache sits in front, the cache key is the URL alone, so a stored response for one tenant is served to another for up to an hour. Affected clients may then send authorization codes and secrets to the wrong tenant's token endpoint and validate tokens against the wrong keys.</p>\n<p>This issue affects ash_authentication_oauth2_server: from 0.1.3 before 0.3.1.</p>"}, {"base64": false, "type": "text/markdown", "value": "Use of Cache Containing Sensitive Information vulnerability in ash-project ash_authentication_oauth2_server allows a shared HTTP cache to serve one tenant's OAuth discovery metadata to another tenant's clients.\n\nThe RFC 8414 and RFC 9728 metadata endpoints in `AshAuthentication.Phoenix.Oauth2Server.ProtocolRouter` return tenant-specific values (`issuer`, `authorization_endpoint`, `token_endpoint`, `jwks_uri`) when a tenant is set, but sent them with `Cache-Control: public, max-age=3600` and no `Vary`. When the tenant is derived from something other than the URL (a header or the `Host`) and a shared cache sits in front, the cache key is the URL alone, so a stored response for one tenant is served to another for up to an hour. Affected clients may then send authorization codes and secrets to the wrong tenant's token endpoint and validate tokens against the wrong keys.\n\nThis issue affects ash_authentication_oauth2_server: from 0.1.3 before 0.3.1."}], "value": "Use of Cache Containing Sensitive Information vulnerability in ash-project ash_authentication_oauth2_server allows a shared HTTP cache to serve one tenant's OAuth discovery metadata to another tenant's clients.\n\nThe RFC 8414 and RFC 9728 metadata endpoints in AshAuthentication.Phoenix.Oauth2Server.ProtocolRouter return tenant-specific values (issuer, authorization_endpoint, token_endpoint, jwks_uri) when a tenant is set, but sent them with Cache-Control: public, max-age=3600 and no Vary. When the tenant is derived from something other than the URL (a header or the Host) and a shared cache sits in front, the cache key is the URL alone, so a stored response for one tenant is served to another for up to an hour. Affected clients may then send authorization codes and secrets to the wrong tenant's token endpoint and validate tokens against the wrong keys.\n\nThis issue affects ash_authentication_oauth2_server: from 0.1.3 before 0.3.1."}], "impacts": [{"capecId": "CAPEC-204", "descriptions": [{"lang": "en", "value": "CAPEC-204 Lifting Sensitive Data Embedded in Cache"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 6.3, "baseSeverity": "MEDIUM", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:L/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-524", "description": "CWE-524 Use of Cache Containing Sensitive Information", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-09-07T22:28:24.500Z"}, "references": [{"tags": ["vendor-advisory", "related"], "url": "https://github.com/ash-project/ash_authentication_oauth2_server/security/advisories/GHSA-crqf-7m54-4hgc"}, {"tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-82755.html"}, {"tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-82755"}, {"tags": ["patch"], "url": "https://github.com/ash-project/ash_authentication_oauth2_server/commit/768d87f70e4e97ae1d2bf1606b5bf3f4d03f24a1"}], "source": {"discovery": "EXTERNAL"}, "title": "ash_authentication_oauth2_server serves tenant-specific OAuth metadata as publicly cacheable without Vary, enabling cross-tenant confusion"}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-08T14:42:10.746522Z", "id": "CVE-2026-82755", "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": "2026-09-08T14:42:17.718Z"}}]}}

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When the tenant is derived from something other than the URL (a header or the Host) and a shared cache sits in front, the cache key is the URL alone, so a stored response for one tenant is served to another for up to an hour. Affected clients may then send authorization codes and secrets to the wrong tenant's token endpoint and validate tokens against the wrong keys.\n\nThis issue affects ash_authentication_oauth2_server: from 0.1.3 before 0.3.1.", "supportingMedia": [{"type": "text/html", "value": "<p>Use of Cache Containing Sensitive Information vulnerability in ash-project ash_authentication_oauth2_server allows a shared HTTP cache to serve one tenant's OAuth discovery metadata to another tenant's clients.</p>\n<p>The RFC 8414 and RFC 9728 metadata endpoints in <code>AshAuthentication.Phoenix.Oauth2Server.ProtocolRouter</code> return tenant-specific values (<code>issuer</code>, <code>authorization_endpoint</code>, <code>token_endpoint</code>, <code>jwks_uri</code>) when a tenant is set, but sent them with <code>Cache-Control: public, max-age=3600</code> and no <code>Vary</code>. When the tenant is derived from something other than the URL (a header or the <code>Host</code>) and a shared cache sits in front, the cache key is the URL alone, so a stored response for one tenant is served to another for up to an hour. Affected clients may then send authorization codes and secrets to the wrong tenant's token endpoint and validate tokens against the wrong keys.</p>\n<p>This issue affects ash_authentication_oauth2_server: from 0.1.3 before 0.3.1.</p>", "base64": false}, {"type": "text/markdown", "value": "Use of Cache Containing Sensitive Information vulnerability in ash-project ash_authentication_oauth2_server allows a shared HTTP cache to serve one tenant's OAuth discovery metadata to another tenant's clients.\n\nThe RFC 8414 and RFC 9728 metadata endpoints in `AshAuthentication.Phoenix.Oauth2Server.ProtocolRouter` return tenant-specific values (`issuer`, `authorization_endpoint`, `token_endpoint`, `jwks_uri`) when a tenant is set, but sent them with `Cache-Control: public, max-age=3600` and no `Vary`. When the tenant is derived from something other than the URL (a header or the `Host`) and a shared cache sits in front, the cache key is the URL alone, so a stored response for one tenant is served to another for up to an hour. Affected clients may then send authorization codes and secrets to the wrong tenant's token endpoint and validate tokens against the wrong keys.\n\nThis issue affects ash_authentication_oauth2_server: from 0.1.3 before 0.3.1.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-524", "description": "CWE-524 Use of Cache Containing Sensitive Information"}]}], "configurations": [{"lang": "en", "value": "Reachable only in a multi-tenant deployment where the tenant is derived from outside the request URL (a header or the Host) and a shared HTTP cache (CDN, reverse proxy) sits in front of the metadata endpoints.", "supportingMedia": [{"type": "text/html", "value": "<p>Reachable only in a multi-tenant deployment where the tenant is derived from outside the request URL (a header or the <code>Host</code>) and a shared HTTP cache (CDN, reverse proxy) sits in front of the metadata endpoints.</p>", "base64": false}, {"type": "text/markdown", "value": "Reachable only in a multi-tenant deployment where the tenant is derived from outside the request URL (a header or the `Host`) and a shared HTTP cache (CDN, reverse proxy) sits in front of the metadata endpoints.", "base64": false}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:ash-project:ash_authentication_oauth2_server:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "0.3.1", "versionStartIncluding": "0.1.3"}], "operator": "OR"}], "operator": "AND"}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-09-07T22:28:24.500Z"}}}, "cveMetadata": {"cveId": "CVE-2026-82755", "state": "PUBLISHED", "dateUpdated": "2026-09-08T14:42:17.718Z", "dateReserved": "2026-08-31T01:00:10.817Z", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "datePublished": "2026-09-07T22:28:24.500Z", "assignerShortName": "EEF"}, "dataVersion": "5.2"}

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Affected clients may then send authorization codes and secrets to the wrong tenant's token endpoint and validate tokens against the wrong keys.\n\nThis issue affects ash_authentication_oauth2_server: from 0.1.3 before 0.3.1."}], "id": "CVE-2026-82755", "lastModified": "2026-09-08T15:18:50.490", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.3, "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": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:L/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": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-82755", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-08T14:42:10.746522Z", "version": "2.0.3"}}]}, "published": "2026-09-07T23:16:52.580", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-82755.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/ash-project/ash_authentication_oauth2_server/commit/768d87f70e4e97ae1d2bf1606b5bf3f4d03f24a1"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/ash-project/ash_authentication_oauth2_server/security/advisories/GHSA-crqf-7m54-4hgc"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-82755"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-524"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.1.3,0.3.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "ash_authentication_oauth2_server", "source": "cna", "vendor": "ash-project"}, "product": "ash_authentication_oauth2_server", "vendor": "ash-project"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[99de0a1cacb5ef667c4533278b7c81ca98c00231,768d87f70e4e97ae1d2bf1606b5bf3f4d03f24a1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "ash_authentication_oauth2_server", "source": "cna", "vendor": "ash-project"}, "product": "ash_authentication_oauth2_server", "vendor": "ash-project"}], "created": "2026-09-08T00:00:11.290340+00:00", "updated": "2026-09-08T20:36:41.328083+00:00", "vendors": ["ash-project", "ash-project$PRODUCT$ash_authentication_oauth2_server"]}