CVE-2025-31691 json
OAuth2 Server - Moderately critical - Access bypass - SA-CONTRIB-2025-020
published 2025-02-26 20 mo ago modified 2026-09-10 1 mo ago also DRUPAL-CONTRIB-2025-020 , GHSA-4f8q-mwgc-3mwc , EUVD-2025-9026
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 37%
- public exploits
- 0
- none known
Summary
Missing Authorization vulnerability in Drupal OAuth2 Server allows Forceful Browsing.This issue affects OAuth2 Server: from 0.0.0 before 2.1.0.
Patch / fix
- packagist drupal/oauth2_server 2.1.0
- Drupal OAuth2 Server 2.1.0
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 19 mo ago
Exploit prediction
0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | drupal/oauth2_server | <2.1.0 |
2.1.0 |
Affected products
- Drupal OAuth2 Server
Classification
- Weakness
-
- CWE-862 Missing Authorization
References
-
drupal.org
/sa-contrib-2025-020
web, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-31691
advisory
-
git.drupalcode.org
/project/oauth2_server
package
Sources
- CVE List CVE-2025-31691
- GitHub Advisory GHSA-4f8q-mwgc-3mwc
- NVD CVE-2025-31691
- OSV DRUPAL-CONTRIB-2025-020
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