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VulnerabilityCVE-2026-82758Published 2026-09-07

CVE-2026-82758 — ash-project ash_authentication_oauth2_server

medium (derived)

As of 2026-09-08, CVE-2026-82758 is a Medium-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in ash-project ash_authentication_oauth2_server, CVSS v4.0 6.3, EPSS 0.3% (31.3th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-82758 as of 2026-09-08; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

CVSS v4.0
6.3/10Medium (derived)
EPSS
0.3%Higher than 31.3% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
0None linked yet
Priority
4.4/10Threadlinqs triage score
Published
Updated 2026-09-08
CVSS v4.0 6.3 (Medium, derived from score) · EPSS 0.3% (higher than 31.3% of all scored CVEs) · Priority 4.4/10 · Published 2026-09-07

Last updated:

What is CVE-2026-82758?

Improper Authentication vulnerability in ash-project ash_authentication_oauth2_server allows an unauthenticated attacker to register OAuth clients even when Dynamic Client Registration is gated by an initial access token. resolve_secret/3 in AshAuthentication.Oauth2Server (reached through __resolve_secret__!) treated any return other than {:ok, _} or :error from a configured {module, function, args} or 2-arity-function secret provider as a valid secret, wrapping nil, false, or "" as {:ok, value}. When the initial_access_token resolves to such an empty value, POST /oauth/register compares the presented bearer token against it and the comparison passes with no token supplied, so registration is open although it was configured closed. The same fail-open affected other resolved secrets such as signing_secret. This issue affects ash_authentication_oauth2_server: from 0.1.0 before 0.3.1.

The record classifies CVE-2026-82758 under weakness class CWE-287. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 28 days ago.

Severity and exploitation probability

CVSS v4.0 base score
6.3 — Medium (derived from score)
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
EPSS (FIRST)
0.3% probability of exploitation in the next 30 days, higher than 31.3% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
4.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-09-07, last modified 2026-09-08

Is CVE-2026-82758 being exploited?

It currently carries a trending score of 38 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-82758

No vendor patch reference has been recorded for CVE-2026-82758 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-82758

No threat campaign in the Threadlinqs corpus currently references CVE-2026-82758, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Vendor advisory and patch

Other references