---
id: CVE-2026-18312
title: >-
  Readwise Reader for Android constructs URLs in its WebView using
  attacker-controlled metadata without proper encoding or escaping
summary: >-
  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 …
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
  - CWE-116
vendor: Readwise
product: Reader
affected:
  - Reader >= 8.7.2 <= 8.10.1
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T17:17:07.850'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18312'
references:
  - url: 'https://kb.cert.org/vuls/id/699627'
    label: cret@cert.org
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-25T16:56:09.413897Z'
ingestedAt: '2026-09-25T17:13:14.014Z'
---

## Overview

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)

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.