CVE-2026-82754

{"id": "CVE-2026-82754", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-82754", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-08T14:41:33.862078Z"}}], "cvssMetricV40": [{"type": "Secondary", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.3, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "affectedData": [{"cpes": ["cpe:2.3:a:ash-project:ash_authentication_oauth2_server:*:*:*:*:*:*:*:*"], "repo": "https://github.com/ash-project/ash_authentication_oauth2_server", "vendor": "ash-project", "modules": ["'Elixir.AshAuthentication.Phoenix.Oauth2Server.Router'", "'Elixir.AshAuthentication.Phoenix.Oauth2Server.ProtocolRouter'"], "product": "ash_authentication_oauth2_server", "versions": [{"status": "affected", "version": "0.1.0", "lessThan": "0.3.1", "versionType": "semver"}], "packageURL": "pkg:hex/ash_authentication_oauth2_server", "packageName": "ash_authentication_oauth2_server", "programFiles": ["lib/ash_authentication_phoenix/oauth2_server/router.ex", "lib/ash_authentication_phoenix/oauth2_server/protocol_router.ex"], "collectionURL": "https://repo.hex.pm", "defaultStatus": "unaffected", "programRoutines": [{"name": "'Elixir.AshAuthentication.Phoenix.Oauth2Server.Router':oauth2_server_protocol_routes/1"}, {"name": "'Elixir.AshAuthentication.Phoenix.Oauth2Server.ProtocolRouter':call/2"}]}, {"cpes": ["cpe:2.3:a:ash-project:ash_authentication_oauth2_server:*:*:*:*:*:*:*:*"], "repo": "https://github.com/ash-project/ash_authentication_oauth2_server", "vendor": "ash-project", "modules": ["'Elixir.AshAuthentication.Phoenix.Oauth2Server.Router'", "'Elixir.AshAuthentication.Phoenix.Oauth2Server.ProtocolRouter'"], "product": "ash_authentication_oauth2_server", "versions": [{"status": "affected", "version": "855b578037c5ded18e8a6e60f42e56bde4905fae", "lessThan": "a72972d7ed3eb74c05dfa0653a258ef14454459a", "versionType": "git"}], "packageURL": "pkg:github/ash-project/ash_authentication_oauth2_server", "packageName": "ash-project/ash_authentication_oauth2_server", "programFiles": ["lib/ash_authentication_phoenix/oauth2_server/router.ex", "lib/ash_authentication_phoenix/oauth2_server/protocol_router.ex"], "collectionURL": "https://github.com", "defaultStatus": "unaffected", "programRoutines": [{"name": "'Elixir.AshAuthentication.Phoenix.Oauth2Server.Router':oauth2_server_protocol_routes/1"}, {"name": "'Elixir.AshAuthentication.Phoenix.Oauth2Server.ProtocolRouter':call/2"}]}]}], "published": "2026-09-07T23:16:52.403", "references": [{"url": "https://cna.erlef.org/cves/CVE-2026-82754.html", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://github.com/ash-project/ash_authentication_oauth2_server/commit/a72972d7ed3eb74c05dfa0653a258ef14454459a", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://github.com/ash-project/ash_authentication_oauth2_server/security/advisories/GHSA-wwxg-h779-3wf4", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}, {"url": "https://osv.dev/vulnerability/EEF-CVE-2026-82754", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "description": [{"lang": "en", "value": "CWE-424"}]}], "descriptions": [{"lang": "en", "value": "Improper Protection of Alternate Path vulnerability in ash-project ash_authentication_oauth2_server exposes the state-changing OAuth endpoints under an unintended URL prefix, bypassing controls scoped to the canonical prefix.\n\noauth2_server_protocol_routes/1 in AshAuthentication.Phoenix.Oauth2Server.Router forwards the same ProtocolRouter at both the /oauth prefix and the /.well-known prefix. Phoenix forward strips the matched prefix before dispatch, so the full route table answers under both mounts, and POST /register, POST /token, and POST /revoke are reachable as /.well-known/register, /.well-known/token, and /.well-known/revoke. Edge controls such as WAF rules, rate limits, or authentication exemptions written against the /oauth paths, or that allow-list /.well-known as unauthenticated, do not apply to the alias.\n\nThis issue affects ash_authentication_oauth2_server: from 0.1.0 before 0.3.1."}], "lastModified": "2026-09-08T15:18:50.320", "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}