Quick answers
- Is CVE-2026-18320 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-18320 being exploited in the wild.
- How severe is CVE-2026-18320?
- Medium severity, with a CVSS score of 6.1, published 25 September 2026.
- Which products and versions are affected?
- Readwise Reader for Android version 8.7.2 and earlier; fixed in 8.10.1.
- Is there a fix for CVE-2026-18320?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-18320 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-18320?
- Check whether you run Readwise Reader for Android at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a stored XSS in the article body sanitization component due to a wildcard attribute rule in the sanitize-html configuration that permits all attributes on SVG and PATH elements. This allows script-capable attributes (onload, onerror, etc.) to bypass sanitization. An attacker supplies a malicious document containing crafted SVG markup that is stored in the user's library, synchronized to Android devices, and executed in the Reader WebView when rendered.
Affected products
- Readwise Reader for Android version 8.7.2 and earlier; fixed in 8.10.1
Timeline
- 2026-09-25: disclosed