Unsanitized SVG in Nextcloud Contacts <=4.2.4 allows XSS via JS blob
CVE-2023-33182 Published on May 30, 2023
Nextcloud Contacts photos only sanitized if mime type is all lower case
Contacts app for Nextcloud easily syncs contacts from various devices with your Nextcloud and allows editing. The unsanitized SVG is converted to a JavaScript blob (in memory data) that the Avatar can't render. Due to this constellation the missing sanitization does not seem to be exploitable. It is recommended that the Contacts app is upgraded to 5.0.3 or 4.2.4
Vulnerability Analysis
CVE-2023-33182 is exploitable with network access, and requires 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 availability.
Weakness Type
Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Products Associated with CVE-2023-33182
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Affected Versions
nextcloud security-advisories:- Version >= 4.1.0, < 4.2.4 is affected.
- Version >= 5.0.0, < 5.0.3 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.