CVE-2026-18320: CWE-79 in Readwise Reader
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 wher rendered in the Reader WebView, resulting in client-side cross-site scripting (XSS).
AI Analysis
Technical Summary
CVE-2026-18320 is a client-side cross-site scripting (XSS) vulnerability in Readwise Reader for Android. The root cause is a sanitize-html configuration that uses a wildcard attribute rule permitting all attributes on SVG and PATH elements. This allows script-capable event handler attributes (e.g., 'onload', 'onerror') to remain in sanitized content. An attacker can supply malicious SVG content that survives sanitization and executes arbitrary scripts in the Reader WebView context, leading to XSS.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary scripts in the context of the Readwise Reader WebView on Android devices. This can lead to unauthorized actions, data theft, or other client-side impacts typical of XSS vulnerabilities. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Users and administrators should monitor the vendor advisory and apply updates once available. Until then, caution is advised when opening untrusted documents containing SVG content in affected versions.
CVE-2026-18320: CWE-79 in Readwise Reader
Description
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 wher rendered in the Reader WebView, resulting in client-side cross-site scripting (XSS).
CVSS v3.1
Score 6.1medium
Affected software
Readwise
Reader
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-18320 is a client-side cross-site scripting (XSS) vulnerability in Readwise Reader for Android. The root cause is a sanitize-html configuration that uses a wildcard attribute rule permitting all attributes on SVG and PATH elements. This allows script-capable event handler attributes (e.g., 'onload', 'onerror') to remain in sanitized content. An attacker can supply malicious SVG content that survives sanitization and executes arbitrary scripts in the Reader WebView context, leading to XSS.
Potential Impact
Successful exploitation allows an attacker to execute arbitrary scripts in the context of the Readwise Reader WebView on Android devices. This can lead to unauthorized actions, data theft, or other client-side impacts typical of XSS vulnerabilities. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Users and administrators should monitor the vendor advisory and apply updates once available. Until then, caution is advised when opening untrusted documents containing SVG content in affected versions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- certcc
- Date Reserved
- 2026-07-29T18:50:43.819Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://kb.cert.org/vuls/id/699627","vendor":"CERT"}]
Threat ID: 6ab6a5d4f7a7c54106055639
Added to database: 09/25/2026, 16:48:20 UTC
Last enriched: 09/25/2026, 17:03:50 UTC
Last updated: 09/26/2026, 02:42:45 UTC
Views: 12
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