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CVE-2023-39953

MEDIUM
Published 2023-08-10T13:55:19.957Z
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CVSS Score

V3.1
4.8
/10
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.005
probability
of exploitation in the wild

There is a 0.5% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.645
Higher than 64.5% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
LOW
Integrity
LOW
Availability
NONE

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

nextcloud

security-advisories

Affected Versions:

>= 1.0.0, < 1.3.3

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xx3h-v363-q36j
https://github.com/nextcloud/user_oidc/pull/642
https://hackerone.com/reports/2021684
Published: 2023-08-10T13:55:19.957Z
Last Modified: 2024-10-03T15:11:48.536Z
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