CVE-2026-18320 CVE-2026-18320
An attacker can execute arbitrary scripts in the Readwise Reader Android app via malicious SVG content due to insufficient HTML sanitization.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-18320?
CVE-2026-18320 is a medium-severity cross-site scripting vulnerability in Readwise Reader, published on 25 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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).
Weakness: CWE-79
Which versions are affected by CVE-2026-18320?
How do I fix CVE-2026-18320?
No fix has been published for CVE-2026-18320 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-18320 being exploited?
There is no known exploitation of CVE-2026-18320 in the wild and no public exploit code.
Sources
Also known as GHSA-v29r-35gc-f5pr.