vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2023-25820

Nextcloud Server and Enterprise Server missing brute force protection on password confirmation modal

HIGH
7.8
CVSS Score
Published: March 22, 2023 at 06:22 PM UTC
Updated: June 17, 2026 at 05:42 AM UTC
1 product affected across 1 vendorNextcloud/server

Using security-advisories by nextcloud?

Get instant alerts when new vulnerabilities affect security-advisories - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nextcloud/server· Nextcloudnextcloud-app
95%
21.0.0 ≤ v < 21.0.922.2.0 ≤ v < 22.2.10.1023.0.0 ≤ v < 23.0.12.524.0.0 ≤ v < 24.0.1025.0.0 ≤ v < 25.0.4
Affected range stops below 21.0.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 22.2.10.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 23.0.12.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 24.0.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 25.0.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-36g6-wjx2-333x
x_refsource_MISCPatch
Source: [email protected]
https://github.com/nextcloud/server/pull/36489
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://hackerone.com/reports/1842114

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGH[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-307

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card