Vulnerability identifier: #VU83350
Vulnerability risk: Low
CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-79
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Nextcloud Server
Client/Desktop applications /
Messaging software
Nextcloud Enterprise Server
Client/Desktop applications /
Messaging software
Vendor: Nextcloud
Description
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data in search UI when selecting a circle with HTML in the display name. A remote user can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
Nextcloud Server: 25.0.0 - 27.1.2
Nextcloud Enterprise Server: 25.0.0 - 27.1.2
External links
http://github.com/nextcloud/security-advisories/security/advisories/GHSA-wgpw-qqq2-gwv6
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.