CVE-2026-82754 (GCVE-0-2026-82754)
Vulnerability from cvelistv5 – Published: 2026-09-07 22:23 – Updated: 2026-09-08 14:41
VLAI
EPSS
VEX
Title
ash_authentication_oauth2_server aliases every protocol endpoint under /.well-known, bypassing path-scoped controls
Summary
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.
oauth2_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.
This issue affects ash_authentication_oauth2_server: from 0.1.0 before 0.3.1.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 14:41 UTC
CWE
- CWE-424 - Improper Protection of Alternate Path
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ash-project/ash_authentication… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-82754.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-82754 | related |
| https://github.com/ash-project/ash_authentication… | patch |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| ash-project | ash_authentication_oauth2_server |
Affected:
0.1.0 , < 0.3.1
(semver)
cpe:2.3:a:ash-project:ash_authentication_oauth2_server:*:*:*:*:*:*:*:* |
||
| ash-project | ash_authentication_oauth2_server |
Affected:
855b578037c5ded18e8a6e60f42e56bde4905fae , < a72972d7ed3eb74c05dfa0653a258ef14454459a
(git)
cpe:2.3:a:ash-project:ash_authentication_oauth2_server:*:*:*:*:*:*:*:* |
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"vulnrichment": {
"containers": "{\"cna\": {\"title\": \"ash_authentication_oauth2_server aliases every protocol endpoint under /.well-known, bypassing path-scoped controls\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Peter Ullrich\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Peter Ullrich\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Zach Daniel / Ash Project\"}, {\"lang\": \"en\", \"type\": \"coordinator\", \"value\": \"Jonatan M\\u00e4nnchen / EEF\"}], \"impacts\": [{\"capecId\": \"CAPEC-554\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-554 Functionality Bypass\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"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\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"LOW\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"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\": [\"\u0027Elixir.AshAuthentication.Phoenix.Oauth2Server.Router\u0027\", \"\u0027Elixir.AshAuthentication.Phoenix.Oauth2Server.ProtocolRouter\u0027\"], \"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\": \"\u0027Elixir.AshAuthentication.Phoenix.Oauth2Server.Router\u0027:oauth2_server_protocol_routes/1\"}, {\"name\": \"\u0027Elixir.AshAuthentication.Phoenix.Oauth2Server.ProtocolRouter\u0027: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\": [\"\u0027Elixir.AshAuthentication.Phoenix.Oauth2Server.Router\u0027\", \"\u0027Elixir.AshAuthentication.Phoenix.Oauth2Server.ProtocolRouter\u0027\"], \"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\": \"\u0027Elixir.AshAuthentication.Phoenix.Oauth2Server.Router\u0027:oauth2_server_protocol_routes/1\"}, {\"name\": \"\u0027Elixir.AshAuthentication.Phoenix.Oauth2Server.ProtocolRouter\u0027:call/2\"}]}], \"references\": [{\"url\": \"https://github.com/ash-project/ash_authentication_oauth2_server/security/advisories/GHSA-wwxg-h779-3wf4\", \"tags\": [\"vendor-advisory\", \"related\"]}, {\"url\": \"https://cna.erlef.org/cves/CVE-2026-82754.html\", \"tags\": [\"related\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-82754\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/ash-project/ash_authentication_oauth2_server/commit/a72972d7ed3eb74c05dfa0653a258ef14454459a\", \"tags\": [\"patch\"]}], \"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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eImproper 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.\u003c/p\u003e\\n\u003cp\u003e\u003ccode\u003eoauth2_server_protocol_routes/1\u003c/code\u003e in \u003ccode\u003eAshAuthentication.Phoenix.Oauth2Server.Router\u003c/code\u003e forwards the same \u003ccode\u003eProtocolRouter\u003c/code\u003e at both the \u003ccode\u003e/oauth\u003c/code\u003e prefix and the \u003ccode\u003e/.well-known\u003c/code\u003e prefix. Phoenix \u003ccode\u003eforward\u003c/code\u003e strips the matched prefix before dispatch, so the full route table answers under both mounts, and \u003ccode\u003ePOST /register\u003c/code\u003e, \u003ccode\u003ePOST /token\u003c/code\u003e, and \u003ccode\u003ePOST /revoke\u003c/code\u003e are reachable as \u003ccode\u003e/.well-known/register\u003c/code\u003e, \u003ccode\u003e/.well-known/token\u003c/code\u003e, and \u003ccode\u003e/.well-known/revoke\u003c/code\u003e. Edge controls such as WAF rules, rate limits, or authentication exemptions written against the \u003ccode\u003e/oauth\u003c/code\u003e paths, or that allow-list \u003ccode\u003e/.well-known\u003c/code\u003e as unauthenticated, do not apply to the alias.\u003c/p\u003e\\n\u003cp\u003eThis issue affects ash_authentication_oauth2_server: from 0.1.0 before 0.3.1.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"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\\n`oauth2_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.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-424\", \"description\": \"CWE-424 Improper Protection of Alternate Path\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"The routing alias is unconditional. Exploitable impact depends on the deployment applying path-scoped edge controls (WAF, rate limiting, auth-redirect exemptions) to the /oauth prefix, or allow-listing /.well-known as unauthenticated, that the alias then bypasses.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eThe routing alias is unconditional. Exploitable impact depends on the deployment applying path-scoped edge controls (WAF, rate limiting, auth-redirect exemptions) to the \u003ccode\u003e/oauth\u003c/code\u003e prefix, or allow-listing \u003ccode\u003e/.well-known\u003c/code\u003e as unauthenticated, that the alias then bypasses.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"The routing alias is unconditional. Exploitable impact depends on the deployment applying path-scoped edge controls (WAF, rate limiting, auth-redirect exemptions) to the `/oauth` prefix, or allow-listing `/.well-known` as unauthenticated, that the alias then bypasses.\", \"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\": \"0.1.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-09-07T22:23:56.762Z\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-82754\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-08T14:41:33.862078Z\"}}}], \"providerMetadata\": {\"shortName\": \"CISA-ADP\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"dateUpdated\": \"2026-09-08T14:41:40.566Z\"}}]}",
"cveMetadata": "{\"cveId\": \"CVE-2026-82754\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-07T22:23:56.762Z\", \"dateReserved\": \"2026-08-31T01:00:10.817Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-09-07T22:23:56.762Z\", \"assignerShortName\": \"EEF\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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