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CVE-2023-30539

Users can set up workflows using restricted and invisible system tags in Nextcloud

HIGH
8.8
CVSS Score
Published: April 17, 2023 at 09:27 PM UTC
Updated: June 17, 2026 at 05:54 AM UTC
2 products affected across 1 vendorNextcloud/serverNextcloud Files Automated Tagging

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Severity
HIGH8.8
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

Description

Nextcloud is a personal home server system. Depending on the set up tags and other workflows this issue can be used to limit access of others or being able to grant them access when there are system tag based files access control or files retention rules. It is recommended that the Nextcloud Server is upgraded to 24.0.11 or 25.0.5, the Nextcloud Enterprise Server to 21.0.9.11, 22.2.10.11, 23.0.12.6, 24.0.11 or 25.0.5, and the Nextcloud Files automated tagging app to 1.11.1, 1.12.1, 1.13.1, 1.14.2, 1.15.3 or 1.16.1. Users unable to upgrade should disable all workflow related apps. Users are advised to upgrade.

Affected

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

Nextcloud Files Automated Tagging· Nextcloudnextcloud-app
95%
1.14.0 ≤ v < 1.14.21.15.0 ≤ v < 1.15.31.11.01.12.01.13.01.16.0
Affected range stops below 1.14.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.15.3, so it looks safe — our inference, not a vendor statement
Nextcloud/server· Nextcloudnextcloud-app
95%
21.0.0 ≤ v < 21.0.9.1122.0.0 ≤ v < 22.2.10.1123.0.0 ≤ v < 23.0.12.624.0.0 ≤ v < 24.0.1125.0.0 ≤ v < 25.0.5
Affected range stops below 21.0.9.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 22.2.10.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 23.0.12.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 24.0.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 25.0.5, 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 (4)

x_refsource_MISCIssue TrackingPatch
Source: [email protected]
https://github.com/nextcloud/files_automatedtagging/pull/705
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-3m2f-v8x7-9w99
x_refsource_MISCPatch
Source: [email protected]
https://github.com/nextcloud/server/pull/37252
x_refsource_MISCPermissions Required
Source: [email protected]
https://hackerone.com/reports/1895976

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-284NVD-CWE-noinfo

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