How severe is CVE-2025-31691?

CVE-2025-31691 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-31691 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-31691?

CVE-2025-31691 affects Oauth2 Server Project Oauth2 Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-31691?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-31691 have an EU (EUVD) identifier?

Yes. CVE-2025-31691 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-9026.

When was CVE-2025-31691 published?

CVE-2025-31691 was published on 2025-03-31 and last updated on 2026-06-17.

CVE-2025-31691

CVE-2025-31691 is a critical-severity vulnerability in Oauth2 Server Project Oauth2 Server with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-9026
Weakness: CWE-862
Affected product: Oauth2 Server Project Oauth2 Server
Published: 2025-03-31
Last modified: 2026-06-17

Description

Missing Authorization vulnerability in Drupal OAuth2 Server allows Forceful Browsing.This issue affects OAuth2 Server: from 0.0.0 before 2.1.0.

Frequently asked questions

What is CVE-2025-31691?: Missing Authorization vulnerability in Drupal OAuth2 Server allows Forceful Browsing.This issue affects OAuth2 Server: from 0.0.0 before 2.1.0.
How severe is CVE-2025-31691?: CVE-2025-31691 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-31691 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-31691?: CVE-2025-31691 affects Oauth2 Server Project Oauth2 Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-31691?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-31691 have an EU (EUVD) identifier?: Yes. CVE-2025-31691 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-9026.
When was CVE-2025-31691 published?: CVE-2025-31691 was published on 2025-03-31 and last updated on 2026-06-17.

References

https://www.drupal.org/sa-contrib-2025-020

Affected products (1)

cpe:2.3:a:oauth2_server_project:oauth2_server:*:*:*:*:*:drupal:*:*

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