NextCloud Notes HTML Preview XSS 4.4.0-4.7.99
CVE-2023-39955 Published on August 10, 2023

Notes attachment render HTML in preview mode
Notes is a note-taking app for Nextcloud, an open-source cloud platform. Starting in version 4.4.0 and prior to version 4.8.0, when creating a note file with HTML, the content is rendered in the preview instead of the file being offered to download. Nextcloud Notes app version 4.8.0 contains a patch for the issue. No known workarounds are available.

NVD

Vulnerability Analysis

CVE-2023-39955 can be exploited 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, with no impact on integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
REQUIRED
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
LOW
Availability Impact:
NONE

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-2023-39955 has been classified to as a XSS vulnerability or weakness.


Products Associated with CVE-2023-39955

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Nextcloud Notes
 

Affected Versions

nextcloud security-advisories Version >= 4.4.0, < 4.8.0 is affected by CVE-2023-39955

Exploit Probability

EPSS
0.71%
Percentile
71.80%

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.