CVE-2023-32320

Nextcloud Server's brute force protection allows someone to send more requests than intended

HIGH

7.5

CVSS Score

Published: June 22, 2023 at 08:57 PM UTC

Updated: June 17, 2026 at 05:58 AM UTC

1 product affected across 1 vendorNextcloud/server

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Severity

HIGH7.5

Exploit prediction

EPSS 0.9%

SSVC

No known exploit

Description

Nextcloud Server is a data storage system for Nextcloud, a self-hosted productivity platform. When multiple requests are sent in parallel, all of them were executed even if the amount of faulty requests succeeded the limit by the time the response was sent to the client. This allowed someone to send as many requests the server could handle in parallel to bruteforce protected details instead of the configured limit, default 8. Nextcloud Server versions 25.0.7 and 26.0.2 and Nextcloud Enterprise Server versions 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7 and 26.0.2 contain patches for this issue.

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 < 21.0.9.1222.0.0 ≤ v < 22.2.10.1223.0.0 ≤ v < 23.0.12.724.0.0 ≤ v < 24.0.12.225.0.0 ≤ v < 25.0.726.0.0 ≤ v < 26.0.2

Affected range stops below 21.0.9.12, so it looks safe — our inference, not a vendor statement

Affected range stops below 22.2.10.12, so it looks safe — our inference, not a vendor statement

Affected range stops below 23.0.12.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 24.0.12.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 25.0.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 26.0.2, 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_CONFIRMPatchVendor Advisory

Source: [email protected]

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qphh-6xh7-vffg

x_refsource_MISCPatch

Source: [email protected]

https://github.com/nextcloud/server/pull/38274

x_refsource_MISCPermissions Required

Source: [email protected]

https://hackerone.com/reports/1918525

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-307

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