OAuth2 Server - Moderately critical - Access bypass - SA-CONTRIB-2025-020
Priority MEDIUM 49CWE-862Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub. Impact type from CWE-862.
Summary
Missing Authorization vulnerability in Drupal OAuth2 Server allows Forceful Browsing.This issue affects OAuth2 Server: from 0.0.0 before 2.1.0.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00434 37th percentileScored 2026-11-07
Fix Fixed OAuth2 Server (Drupal): 2.1.0drupal/oauth2_server (Packagist): 2.1.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Drupal | OAuth2 Server | 0.0.0 to before 2.1.0 | 2.1.0 | Patch available | CNA |
| — | drupal/oauth2_server (Packagist) | before 2.1.0 | 2.1.0 | Patch available | GHSA-4f8q-mwgc-3mwc |
- OAuth2 Server VendorDrupal Affected 0.0.0 to before 2.1.0 Fixed in 2.1.0 Patch available CNA
- drupal/oauth2_server (Packagist) Vendor— Affected before 2.1.0 Fixed in 2.1.0 Patch available GHSA-4f8q-mwgc-3mwc
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:oauth2_server_project:oauth2_server:*:*:*:*:*:drupal:*:* | before 2.1.0 | Vulnerable | Oauth2 Server Project |
- cpe:2.3:a:oauth2_server_project:oauth2_server:*:*:*:*:*:drupal:*:* Versions before 2.1.0 Vulnerable ·Oauth2 Server Project
Remediation
- Fix · CNA OAuth2 Server (Drupal) Fixed in 2.1.0
- Fix · GHSA-4f8q-mwgc-3mwc drupal/oauth2_server (Packagist) Fixed in 2.1.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-31691
- 2026-10-03 Alias added: GHSA-4f8q-mwgc-3mwc
References
More Drupal vulnerabilities
- TI-2026-07979 Drupal core - Highly critical - SQL injection - SA-CORE-2026-004 KEVCVSS 3.1CRITICAL 9.8
- TI-2018-05494 Drupal core - Highly critical - Remote Code Execution - SA-CORE-2018-004 KEVCVSS 3.1CRITICAL 9.8
- TI-2018-05493 Improper input validation in Drupal before 7.58, 8.x before 8.3.9, 8.4.x before 8.4.6… KEVCVSS 3.1CRITICAL 9.8
- TI-2020-10731 Unrestricted file upload in Drupal Core KEVCVSS 3.1HIGH 8.8
- TI-2019-04505 Drupal core - Highly critical - Remote Code Execution KEVCVSS 3.1HIGH 8.1
- TI-2020-17477 Archive_Tar through 1.4.10 has :// filename sanitization only to address phar attacks… KEVCVSS 3.1HIGH 7.8
Sources
- CVE-2025-31691 · CVE Program
- CVE-2025-31691 · NVD
- FIRST EPSS
- GHSA-4f8q-mwgc-3mwc · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences