Readwise Reader Android XSS via poisoned documents
Three stored XSS flaws in Readwise Reader for Android allow attackers to execute JavaScript through malicious document metadata and SVG markup; version 8.10.1 patches the sanitizer issue.
Sourcekb.cert.org — open the original
What to check
- Applies to
- The 3 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
Readwise Reader for Android versions up to 8.7.2 contain three stored cross-site scripting (XSS) vulnerabilities affecting document rendering. CVE-2026-18311 exploits insufficient HTML escaping in metadata fields like author and title; CVE-2026-18312 targets improper URL escaping in WebView construction for video fallbacks and paywalls; CVE-2026-18320 results from overly permissive SVG/PATH attribute rules in the sanitizer that allow script-capable attributes like onload and onerror.
An attacker who can create or modify documents accessible to the application—either through direct library access or by supplying poisoned content that users save—can inject arbitrary JavaScript that executes within the WebView context. This enables theft of stored documents, credentials, and session tokens. The vulnerabilities are stored, meaning malicious payloads persist in users' libraries and sync across devices.
Version 8.10.1 addresses the sanitizer-wildcard issue (CVE-2026-18320). Users should update immediately and exercise caution when adding content from untrusted sources. The vendor was unreachable at the time of disclosure.
Mentioned in this report
Source reporting: https://kb.cert.org/vuls/id/699627
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