# ash\_authentication\_oauth2\_server (Hex) vulnerabilities

6 known vulnerabilities (1 high, 5 medium), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: not known (cve.now hasn't read this package's releases)
- Newest unaffected release: not known without release data
- Registry: https://hex.pm/packages/ash_authentication_oauth2_server

## Advisories (6)

### [CVE-2026-82758](https://cve.now/CVE-2026-82758): ash\_authentication\_oauth2\_server treats an empty resolved secret as valid, opening the gated Dynamic Client Registration endpoint

- Severity: Medium 6.3
- Published: Sep 7, 2026
- Affected: from 0.1.0, fixed in 0.3.1; from 0.1.0, fixed in 0.3.1.

### [CVE-2026-82757](https://cve.now/CVE-2026-82757): ash\_authentication\_oauth2\_server CIMD fetcher classifies IPv4-in-IPv6 and site-local addresses as public, allowing SSRF

- Severity: Medium 6.3
- Published: Sep 7, 2026
- Affected: from 0.3.0, fixed in 0.3.1; from 0.3.0, fixed in 0.3.1.

### [CVE-2026-82756](https://cve.now/CVE-2026-82756): ash\_authentication\_oauth2\_server interpolates a tenant-derived value into the WWW-Authenticate challenge without escaping, allowing header…

- Severity: Medium 6.3
- Published: Sep 7, 2026
- Affected: from 0.1.3, fixed in 0.3.1; from 0.1.3, fixed in 0.3.1.

### [CVE-2026-82755](https://cve.now/CVE-2026-82755): ash\_authentication\_oauth2\_server serves tenant-specific OAuth metadata as publicly cacheable without Vary, enabling cross-tenant confusion

- Severity: Medium 6.3
- Published: Sep 7, 2026
- Affected: from 0.1.3, fixed in 0.3.1; from 0.1.3, fixed in 0.3.1.

### [CVE-2026-82754](https://cve.now/CVE-2026-82754): ash\_authentication\_oauth2\_server aliases every protocol endpoint under /.well-known, bypassing path-scoped controls

- Severity: Medium 6.3
- Published: Sep 7, 2026
- Affected: from 0.1.0, fixed in 0.3.1; from 0.1.0, fixed in 0.3.1.

### [CVE-2026-82753](https://cve.now/CVE-2026-82753): Unauthenticated authorize requests create unbounded, never-expiring CIMD client rows and cache entries in ash\_authentication\_oauth2\_server

- Severity: High 8.2
- Published: Sep 7, 2026
- Affected: from 0.3.0, fixed in 0.3.1; from 0.3.0, fixed in 0.3.1.

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