TI-2023-26164 Aliases CVE-2023-48301

Nextcloud Server HTML injection in search UI when selecting a circle with HTML in the display name

MEDIUM 58CWE-79Published 2023-11-21 · Updated 2024-10-11

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.0064 50th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed security-advisories (nextcloud): 25.0.13, 26.0.8, 27.1.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
nextcloud	security-advisories	25.0.0 to before 25.0.13; 26.0.0 to before 26.0.8; 27.0.0 to before 27.1.3	25.0.13, 26.0.8, 27.1.3	Patch available	CNA

security-advisories Vendornextcloud Affected 25.0.0 to before 25.0.13; 26.0.0 to before 26.0.8; 27.0.0 to before 27.1.3 Fixed in 25.0.13, 26.0.8, 27.1.3 Patch available CNA

CPE configurations NVD · 6

CPE	Versions	Role	Vendor
cpe:2.3:a:nextcloud:nextcloud_server:::::-:::*	25.0.0 – 25.0.13	Vulnerable	nextcloud
cpe:2.3:a:nextcloud:nextcloud_server:::::enterprise:::*	25.0.0 to before 25.0.13	Vulnerable	nextcloud
cpe:2.3:a:nextcloud:nextcloud_server:::::-:::*	26.0.0 – 26.0.8	Vulnerable	nextcloud
cpe:2.3:a:nextcloud:nextcloud_server:::::enterprise:::*	26.0.0 to before 26.0.8	Vulnerable	nextcloud
cpe:2.3:a:nextcloud:nextcloud_server:::::-:::*	27.0.0 – 27.1.3	Vulnerable	nextcloud
cpe:2.3:a:nextcloud:nextcloud_server:::::enterprise:::*	27.0.0 to before 27.1.3	Vulnerable	nextcloud

cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:* Versions 25.0.0 – 25.0.13 Vulnerable ·nextcloud
cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* Versions 25.0.0 to before 25.0.13 Vulnerable ·nextcloud
cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:* Versions 26.0.0 – 26.0.8 Vulnerable ·nextcloud
cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* Versions 26.0.0 to before 26.0.8 Vulnerable ·nextcloud
cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:* Versions 27.0.0 – 27.1.3 Vulnerable ·nextcloud
cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:* Versions 27.0.0 to before 27.1.3 Vulnerable ·nextcloud

Remediation

Fix · CNA security-advisories (nextcloud) Fixed in 25.0.13, 26.0.8, 27.1.3

Timeline

2026-10-02 Threatist record created from CVE-2023-48301
2026-10-23 EPSS moved to the 50th–90th percentile

References

TI-2023-20855 Users can delete external storage mount points CVSS 3.1HIGH 7.7
TI-2023-11091 Nextcloud download permissions can be changed by resharer CVSS 3.1HIGH 7.5
TI-2023-10624 Nextcloud Server vulnerable to SSRF via filter bypass due to lax checking on IPs CVSS 3.1MEDIUM 5.3
TI-2025-37238 Cross-site scripting in Nextcloud CVSS 3.1MEDIUM 6.4
TI-2023-11086 nextcloud vulnerable to Uncontrolled Resource Consumption CVSS 3.1MEDIUM 6.5
TI-2022-18738 Exception logging in Sharepoint app reveals clear-text connection details CVSS 3.1MEDIUM 6.5

See all 188 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences