What’s Vulnerable › Vulnerabilities

CVE-2023-48301: Nextcloud Server HTML injection in search UI when selecting a circle with HTML in the display name

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-11-21 · updated 2026-06-17
• Weakness: CWE-79

Description

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Server and Nextcloud Enterprise Server, an attacker could insert links into circles name that would be opened when clicking the circle name in a search filter. Nextcloud Server and Nextcloud Enterprise Server versions 25.0.13, 26.0.8, and 27.1.3 contain a fix for this issue. As a workaround, disable app circles.

Affected products

• Nextcloud Server: from 25.0.0 through 25.0.13; from 25.0.0 before 25.0.13; from 26.0.0 through 26.0.8; from 26.0.0 before 26.0.8; from 27.0.0 through 27.1.3; from 27.0.0 before 27.1.3 — fixed in 25.0.13, 26.0.8, 27.1.3

How to fix

Upgrade to a fixed version: Nextcloud Server 25.0.13, 26.0.8, 27.1.3. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/circles/pull/1415
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-wgpw-qqq2-gwv6
• https://hackerone.com/reports/2210038
• https://github.com/nextcloud/circles/pull/1415
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-wgpw-qqq2-gwv6
• https://hackerone.com/reports/2210038

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