CVE-2023-39953
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.
Does this matter?
Lower severity and a low EPSS score (0.54%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 4.8 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
- EPSS
- 0.54% probability · 44th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-303
- Affected
- nextcloud/user oidc
- Source
- security-advisories@github.com
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xx3h-v363-q36jPatch, Vendor Advisory
- https://github.com/nextcloud/user_oidc/pull/642Patch
- https://hackerone.com/reports/2021684Permissions Required
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xx3h-v363-q36jPatch, Vendor Advisory
- https://github.com/nextcloud/user_oidc/pull/642Patch
- https://hackerone.com/reports/2021684Permissions Required
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.