CVE-2023-30539 [Medium] | Security Vulnerability in Nextcloud Files Automated…

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.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.41%	0.63%	+0.22%
2	2026-05-06	0.76%	0.41%	-0.35%
3	2026-04-28	—	0.76%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.41%

0.63%

+0.22%

2026-05-06

0.76%

0.41%

-0.35%

2026-04-28

—

0.76%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.5	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	2.3	3.7	[email protected]
8.8	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	2.8	5.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.5

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

2.3

3.7

[email protected]

8.8

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

2.8

5.9

[email protected]

Affected software / configurations for CVE-2023-30539

Vendor	Product	Version	Raw CPE
nextcloud	nextcloud_files_automated_tagging	>= 1.14.0, < 1.14.2	cpe:2.3:a:nextcloud:nextcloud_files_automated_tagging::::::::
nextcloud	nextcloud_files_automated_tagging	>= 1.15.0, < 1.15.3	cpe:2.3:a:nextcloud:nextcloud_files_automated_tagging::::::::
nextcloud	nextcloud_files_automated_tagging	1.11.0	cpe:2.3:a:nextcloud:nextcloud_files_automated_tagging:1.11.0:::::::*
nextcloud	nextcloud_files_automated_tagging	1.12.0	cpe:2.3:a:nextcloud:nextcloud_files_automated_tagging:1.12.0:::::::*
nextcloud	nextcloud_files_automated_tagging	1.13.0	cpe:2.3:a:nextcloud:nextcloud_files_automated_tagging:1.13.0:::::::*
nextcloud	nextcloud_files_automated_tagging	1.16.0	cpe:2.3:a:nextcloud:nextcloud_files_automated_tagging:1.16.0:::::::*
nextcloud	nextcloud_server	>= 21.0.0, < 21.0.9.11	cpe:2.3:a:nextcloud:nextcloud_server:::::enterprise:::*
nextcloud	nextcloud_server	>= 22.0.0, < 22.2.10.11	cpe:2.3:a:nextcloud:nextcloud_server:::::enterprise:::*
nextcloud	nextcloud_server	>= 23.0.0, < 23.0.12.6	cpe:2.3:a:nextcloud:nextcloud_server:::::enterprise:::*
nextcloud	nextcloud_server	>= 24.0.0, < 24.0.11	cpe:2.3:a:nextcloud:nextcloud_server:::::-:::*
nextcloud	nextcloud_server	>= 24.0.0, < 24.0.11	cpe:2.3:a:nextcloud:nextcloud_server:::::enterprise:::*
nextcloud	nextcloud_server	>= 25.0.0, < 25.0.5	cpe:2.3:a:nextcloud:nextcloud_server:::::-:::*
nextcloud	nextcloud_server	>= 25.0.0, < 25.0.5	cpe:2.3:a:nextcloud:nextcloud_server:::::enterprise:::*

References for CVE-2023-30539

URL	Tags
https://github.com/nextcloud/files_automatedtagging/pull/705	Issue Tracking Patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-3m2f-v8x7-9w99	Vendor Advisory
https://github.com/nextcloud/server/pull/37252	Patch
https://hackerone.com/reports/1895976	Permissions Required

URL

CVE-2023-30539 | Users can set up workflows using restricted and invisible system tags in Nextcloud

Exploit prediction scoring system (EPSS) score for CVE-2023-30539

Common vulnerability scoring system (CVSS) metrics for CVE-2023-30539

Weakness enumeration for CVE-2023-30539

Affected software / configurations for CVE-2023-30539

References for CVE-2023-30539