CVE-2023-39954

low-risk
Published 2023-08-10

user_oidc provides the OIDC connect user backend for Nextcloud, an open-source cloud platform. Starting in version 1.0.0 and prior to version 1.3.3, an attacker that obtained at least read access to a snapshot of the database can impersonate the Nextcloud server towards linked servers. user_oidc 1.3.3 contains a patch. No known workarounds are available.

Do I need to act?

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0.41% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
3
CVSS 3.8/10 Low
NETWORK / LOW complexity

Affected Products (1)

User Oidc

Affected Vendors

Nextcloud

References (6)

Patch https://github.com/nextcloud/security-advisories/security/advisories/GHSA-3f92-5...
Patch https://github.com/nextcloud/user_oidc/pull/636
Permissions Required https://hackerone.com/reports/1994328
Patch https://github.com/nextcloud/security-advisories/security/advisories/GHSA-3f92-5...
Patch https://github.com/nextcloud/user_oidc/pull/636
Permissions Required https://hackerone.com/reports/1994328
24
/ 100
low-risk
Severity 17/34 · Moderate
Exploitability 2/34 · Minimal
Exposure 5/34 · Minimal