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  4. CVE 2026 82754 ashauthenticationoauth2server aliases every
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Back to active CVEs
Medium · CVSS 6.3CVE-2026-82754

ash_authentication_oauth2_server aliases every protocol endpoint under /.well-known, bypassing path-scoped controlsCVE-2026-82754

Answer in brief

CVE-2026-82754 records a Medium severity (CVSS 6.3) vulnerability in ash_authentication_oauth2_server aliases every protocol endpoint under /.well-known, bypassing path-scoped controls. The current sources do not mark it as known exploited. The current feed maps ash-project/ash_authentication_oauth2_server (generic), ash-project/ash_authentication_oauth2_server (generic), ash-project/ash-project/ash_authentication_oauth2_server (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 7, 2026Updated Sep 8, 2026Source checked Oct 25, 2026First seen by HOL Sep 7, 2026Material review Sep 8, 2026
Upstream Advisory

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-424
Source
CVE List V5
Source checked
Oct 25, 2026
References
4 linked sources
Open source record

Key facts

Risk
Medium · CVSS 6.3
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 6.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps ash-project/ash_authentication_oauth2_server (generic), ash-project/ash_authentication_oauth2_server (generic), ash-project/ash-project/ash_authentication_oauth2_server (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
ash-project/ash_authentication_oauth2_servergeneric>=855b578037c5ded18e8a6e60f42e56bde4905fae <a72972d7ed3eb74c05dfa0653a258ef14454459aa72972d7ed3eb74c05dfa0653a258ef14454459a
ash-project/ash_authentication_oauth2_servergeneric>=0.1.0 <0.3.10.3.1
ash-project/ash-project/ash_authentication_oauth2_servergeneric>=855b578037c5ded18e8a6e60f42e56bde4905fae <a72972d7ed3eb74c05dfa0653a258ef14454459aa72972d7ed3eb74c05dfa0653a258ef14454459a

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for ash-project/ash_authentication_oauth2_server, ash-project/ash_authentication_oauth2_server, ash-project/ash-project/ash_authentication_oauth2_server.
  2. 2Review the reported fix. Update ash-project/ash_authentication_oauth2_server to a72972d7ed3eb74c05dfa0653a258ef14454459a; ash-project/ash_authentication_oauth2_server to 0.3.1; ash-project/ash-project/ash_authentication_oauth2_server to a72972d7ed3eb74c05dfa0653a258ef14454459a if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 7, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 7, 2026

Sources and claim methodology

  • Source referencecna.erlef.org
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referenceosv.dev
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.