CVE-2026-18312 CVE-2026-18312
Attackers can inject malicious scripts via crafted metadata in Readwise Reader for Android, leading to stored XSS and potential data theft.
- 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-2026-18312?
CVE-2026-18312 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 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)
Weakness: CWE-79
Which versions are affected by CVE-2026-18312?
How do I fix CVE-2026-18312?
No fix has been published for CVE-2026-18312 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-2026-18312 being exploited?
There is no known exploitation of CVE-2026-18312 in the wild and no public exploit code.
Sources
Also known as GHSA-fjx6-m8r4-w94f.