CVE-2023-39953
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, missing verification of the issuer would have allowed an attacker to perform a man-in-the-middle attack returning corrupted or known token they also have access to. user_oidc 1.3.3 contains a patch. No known workarounds are available.
Do I need to act?
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0.49% 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
4
CVSS 4.8/10
Medium
NETWORK
/ HIGH complexity
Affected Products (1)
User Oidc
Affected Vendors
References (6)
Permissions Required
https://hackerone.com/reports/2021684
Permissions Required
https://hackerone.com/reports/2021684
22
/ 100
low-risk
Severity
15/34 · Moderate
Exploitability
2/34 · Minimal
Exposure
5/34 · Minimal