What’s Vulnerable › Vulnerabilities

CVE-2023-23942: Self reflected HTML injection in Desktop client

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-02-06 · updated 2026-06-17
• Weakness: CWE-79

Description

The Nextcloud Desktop Client is a tool to synchronize files from a Nextcloud Server with your computer. Versions prior to 3.6.3 are missing sanitisation on qml labels which are used for basic HTML elements such as `strong`, `em` and `head` lines in the UI of the desktop client. The lack of sanitisation may allow for javascript injection. It is recommended that the Nextcloud Desktop Client is upgraded to 3.6.3. There are no known workarounds for this issue.

Affected products

• Desktop Client: before 3.6.3 — fixed in 3.6.3

How to fix

Upgrade to a fixed version: Desktop Client 3.6.3. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/desktop/pull/5233
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-64qc-vf6v-8xgg
• https://hackerone.com/reports/1788598
• https://github.com/nextcloud/desktop/pull/5233
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-64qc-vf6v-8xgg
• https://hackerone.com/reports/1788598

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