XSS via Ctrl+Shift+V in Nextcloud Server 25.027.1 (fixed 25.0.13/26.0.8/27.1.3)
CVE-2023-48302 Published on November 21, 2023
Nextcloud Server vulnerable to Self XSS when pasting HTML into Text app with Ctrl+Shift+V
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, when a user is tricked into copy pasting HTML code without markup (Ctrl+Shift+V) the markup will actually render. 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 text.
Vulnerability Analysis
CVE-2023-48302 is exploitable with network access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a small impact on availability.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2023-48302 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2023-48302
You can be notified by email with stack.watch whenever vulnerabilities like CVE-2023-48302 are published in these products:
Affected Versions
nextcloud security-advisories:- Version >= 25.0.0, < 25.0.13 is affected.
- Version >= 26.0.0, < 26.0.8 is affected.
- Version >= 27.0.0, < 27.1.3 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.