Quick answers
- Is CVE-2026-18312 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-18312 being exploited in the wild.
- How severe is CVE-2026-18312?
- Medium severity, with a CVSS score of 6.1, published 25 September 2026.
- Which products and versions are affected?
- Readwise Reader for Android 8.7.2.
- Is there a fix for CVE-2026-18312?
- 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-2026-18312 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-18312?
- 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
A stored XSS vulnerability exists in Readwise Reader for Android's WebView URL construction logic (CVE-2026-18312) where attacker-controlled metadata is interpolated into href attributes without proper HTML or JavaScript context encoding. The vulnerability affects URL metadata used for X (formerly Twitter) video fallback and iOS paywall messages. An attacker can craft a document with malicious metadata that, when synchronized to an Android device and rendered in the WebView, executes arbitrary JavaScript in the application context.
Affected products
- Readwise Reader for Android 8.7.2
Timeline
- 2026-09-25: disclosed