CVE-2022-39346 [Low] | Input Validation Bypass in Nextcloud Enterprise Server

Nextcloud server is an open source personal cloud server. Affected versions of nextcloud server did not properly limit user display names which could allow a malicious users to overload the backing database and cause a denial of service. It is recommended that the Nextcloud Server is upgraded to 22.2.10, 23.0.7 or 24.0.3. There are no known workarounds for this issue.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	1.96%	0.99%	-0.97%
2	2026-06-11	2.08%	1.96%	-0.12%
3	2026-06-05	—	2.08%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

1.96%

0.99%

-0.97%

2026-06-11

2.08%

1.96%

-0.12%

2026-06-05

—

2.08%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
3.5	3.1	LOW	`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/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:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	2.1	1.4	[email protected]
6.5	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	2.8	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

3.5

3.1

LOW

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/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:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

2.1

1.4

[email protected]

6.5

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

2.8

3.6

[email protected]

Affected software / configurations for CVE-2022-39346

Vendor	Product	Version	Raw CPE
nextcloud	nextcloud_enterprise_server	< 22.2.10	cpe:2.3:a:nextcloud:nextcloud_enterprise_server::::::::
nextcloud	nextcloud_enterprise_server	>= 23.0.0, < 23.0.7	cpe:2.3:a:nextcloud:nextcloud_enterprise_server::::::::
nextcloud	nextcloud_enterprise_server	>= 24.0.0, < 24.0.3	cpe:2.3:a:nextcloud:nextcloud_enterprise_server::::::::
nextcloud	nextcloud_server	< 22.2.10	cpe:2.3:a:nextcloud:nextcloud_server::::::::
nextcloud	nextcloud_server	>= 23.0.0, < 23.0.7	cpe:2.3:a:nextcloud:nextcloud_server::::::::
nextcloud	nextcloud_server	>= 24.0.0, < 24.0.3	cpe:2.3:a:nextcloud:nextcloud_server::::::::
fedoraproject	fedora	35	cpe:2.3:o:fedoraproject:fedora:35:::::::*
fedoraproject	fedora	36	cpe:2.3:o:fedoraproject:fedora:36:::::::*
fedoraproject	fedora	37	cpe:2.3:o:fedoraproject:fedora:37:::::::*

References for CVE-2022-39346

URL	Tags
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6w9f-jgjx-4vj6	Third Party Advisory
https://github.com/nextcloud/server/pull/33052	Patch Third Party Advisory
https://hackerone.com/reports/1588562	Permissions Required Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TARDPRPBTI5TJRBYRVVQGTL6KWRCV5/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R32L3P53AQKQQC652LA5U3AWFTZKPDK3/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TRAER4DCCHHSUDFHQ6LTIH4JEJFF73IU/

URL

CVE-2022-39346 | Missing length validation of user displayname in nextcloud server

Exploit prediction scoring system (EPSS) score for CVE-2022-39346

Common vulnerability scoring system (CVSS) metrics for CVE-2022-39346

Weakness enumeration for CVE-2022-39346

Affected software / configurations for CVE-2022-39346

References for CVE-2022-39346