CVE-2023-25820

low-risk
Published 2023-03-22

Nextcloud Server is the file server software for Nextcloud, a self-hosted productivity platform, and Nextcloud Enterprise Server is the enterprise version of the file server software. In Nextcloud Server versions 25.0.x prior to 25.0.5 and versions 24.0.x prior to 24.0.10 as well as Nextcloud Enterprise Server versions 25.0.x prior to 25.0.4, 24.0.x prior to 24.0.10, 23.0.x prior to 23.0.12.5, 22.x prior to 22.2.0.10, and 21.x prior to 21.0.9.10, when an attacker gets access to an already logged in user session they can then brute force the password on the confirmation endpoint. Nextcloud Server should upgraded to 24.0.10 or 25.0.4 and Nextcloud Enterprise Server should upgraded to 21.0.9.10, 22.2.10.10, 23.0.12.5, 24.0.10, or 25.0.4 to receive a patch. No known workarounds are available.

Do I need to act?

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0.03% 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 4.2/10 Medium
LOCAL / HIGH complexity

Affected Products (2)

Affected Vendors

Nextcloud

References (6)

Vendor Advisory https://github.com/nextcloud/security-advisories/security/advisories/GHSA-36g6-w...
Patch https://github.com/nextcloud/server/pull/36489
Third Party Advisory https://hackerone.com/reports/1842114
Vendor Advisory https://github.com/nextcloud/security-advisories/security/advisories/GHSA-36g6-w...
Patch https://github.com/nextcloud/server/pull/36489
Third Party Advisory https://hackerone.com/reports/1842114
18
/ 100
low-risk
Severity 11/34 · Low
Exploitability 0/34 · Minimal
Exposure 7/34 · Low