CVE-2026-18312
MediumCVSS 6.1Summary
Readwise Reader for Android constructs URLs in its WebView using attacker-controlled metadata without proper encoding or escaping. The application interpolates untrusted values directly into URL strings and inserts them into the DOM via innerHTML. Because the interpolation occurs without HTML or JavaScript context encoding, a crafted metadata value can break out of the intended URL structure and inject script content.
Risk Assessment
An attacker can supply a document with malicious metadata that, once synchronized to an Android device, executes injected script in the WebView, enabling stored XSS and potential data theft.
Recommendation
Update Readwise Reader for Android to the latest version that includes a fix for metadata encoding.
Other vulnerabilities in Readwise Reader
See all- CVE-2026-18320Medium
Readwise Reader for Android uses a sanitize-html configuration that permits all attributes on SVG and PATH elements due to a wildcard attribute rule. This configuration fails to remove script-capable attributes such as event handlers (e.g., 'onload', 'onerror'). An attacker could supply a document containing malicious SVG content that survives sanitization and executes script when rendered in the Reader WebView, resulting in client-side cross-site scripting (XSS).
- CVE-2026-18311Medium
Readwise Reader for Android contains a cross-site scripting vulnerability due to missing HTML sanitization in its processing of imported document metadata. Attacker-controlled fields such as the author meta tag are inserted into a WebView via innerHTML, enabling stored XSS that executes on synced devices when the malicious document is opened.
Original NVD description (English source)
Readwise Reader for Android constructs URLs in its WebView using attacker-controlled metadata without proper encoding or escaping. The application interpolates untrusted values directly into URL strings and inserts them into the DOM via innerHTML. Because the interpolation occurs without HTML or JavaScript context encoding, a crafted metadata value can break out of the intended URL structure and inject script content. An attacker could supply a document containing malicious metadata that, once synchronized to an Android device and rendered in the Reader WebView, results in execution of injected script content, enabling stored cross-site scripting (XSS)
Vulnerability data from NVD (NIST) · CISA KEV · EPSS