CVE-2018-3780

A missing sanitization of search results for an autocomplete field in NextCloud Server <13.0.5...

5.4 MediumFix available

A missing sanitization of search results for an autocomplete field in NextCloud Server <13.0.5 could lead to a stored XSS requiring user-interaction. The missing sanitization only affected user names, hence malicious search results could only be crafted by authenticated users.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

0.89%Up 0.3 points since Apr 14, 2021

What each source reports

NVD Score used 5.4

Record: CVE-2018-3780
CVSS 3.0: 5.4 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 3.5 LowAV:N/AC:M/Au:S/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

CVE List No score

Record: CVE-2018-3780
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2018-15575 No score

Record: EUVD-2018-15575
Updated: 2026-11-03

GitHub AdvisoriesGHSA-9qxg-6mvx-c4mc 5.4

A missing sanitization of search results for an autocomplete field in NextCloud Server <13.0.5...

Record: GHSA-9qxg-6mvx-c4mc
CVSS 3.0: 5.4 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 5.4

Record: CVE-2018-3780
CVSS 3.0: 5.4 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVMGASA-2018-0394 No score

Updated nextcloud packages fix security vulnerability

Nextcloud has been updated to 13.0.6 and fixes at least the following security issue:

A missing sanitization of search results for an autocomplete field could lead to a stored XSS requiring user-interaction. The missing sanitization only affected user names, hence malicious search results could only be crafted by authenticated users (CVE-2018-3780).

Record: MGASA-2018-0394
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`nextcloud` Mageia:6	before 13.0.6-1.mga6	13.0.6-1.mga6

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-3780 is a medium vulnerability (CVSS 5.4) in Nextcloud Server, published August 13, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.89%, the 59th percentile. Fixed in nextcloud 13.0.6-1.mga6.