---
id: CVE-2026-107053
title: >-
  Insecure permissions in foobnix Librera PDF Reader versionCode 7222 allows
  unauthorized attackers to arbitrarily write and truncate files in a shared
  storage space outside of the sandbox.
summary: >-
  Insecure permissions in foobnix Librera PDF Reader versionCode 7222 allows
  unauthorized attackers to arbitrarily write and truncate files in a shared
  storage space outside of the sandbox.
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cvssSource: adp
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-11-03T14:26:16.360825Z'
exploitAvailable: true
published: '2026-10-29'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T14:26:28.273Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-107053'
references:
  - url: 'https://f-droid.org/packages/com.foobnix.pro.pdf.reader/'
  - url: 'https://github.com/foobnix/LibreraReader'
  - url: >-
      https://github.com/FFG0d/fdroid-android-advisories/blob/main/advisories/CVE-2026-107053.md
tags:
  - cve.org
  - exploit-available
epss: 0.00361
epssPercentile: 0.3004
ingestedAt: '2026-11-01T21:01:32.737Z'
---

## Overview

Insecure permissions in foobnix Librera PDF Reader versionCode 7222 allows unauthorized attackers to arbitrarily write and truncate files in a shared storage space outside of the sandbox.

## Remediation

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