CVE-2023-39953
Published: 10 August 2023
Summary
CVE-2023-39953 is a medium-severity Incorrect Implementation of Authentication Algorithm (CWE-303) vulnerability in Nextcloud User Oidc. Its CVSS base score is 4.8 (Medium).
Operationally, ranked in the top 29.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-43651
Vulnerability details
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…
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known token they also have access to. user_oidc 1.3.3 contains a patch. No known workarounds are available.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.