Readwise Reader up to 8.10.1 WebView innerHTML cross site scripting

Summaryinfo

A vulnerability was found in Readwise Reader up to 8.10.1. It has been declared as problematic. This affects the function innerHTML of the component WebView. Executing a manipulation can lead to cross site scripting. The identification of this vulnerability is CVE-2026-18312. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic was found in Readwise Reader up to 8.10.1. This vulnerability affects the function innerHTML of the component WebView. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

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)

The advisory is available at kb.cert.org. This vulnerability was named CVE-2026-18312 since 07/29/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Readwise

Name

• Reader

Version

• 8.10.0
• 8.10.1

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CPE 2.2info

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