---
id: CVE-2026-120627
title: CVE-2026-120627
summary: >-
  The Private Internet Access Extension for Firefox contains an unguarded
  onAuthRequired authentication handler, leading to leakage of PIA proxy
  credentials when a user visits any malicious website that issues a Basic auth
  challenge. This …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cvssSource: adp
cwe:
  - CWE-287
vendor: Private Internet Access
product: Firefox extension
affected:
  - firefox_extension >= 3.2.5 <= 4.0.5
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-11-06T17:49:08.710782Z'
published: '2026-11-02'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T17:50:08.315Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-120627'
references:
  - url: >-
      https://addons.mozilla.org/en-US/firefox/addon/private-internet-access-ext/
  - url: 'https://github.com/Rexyysilent/PI-ay-ay-disclosure'
tags:
  - cve.org
epss: 0.00295
epssPercentile: 0.22232
ingestedAt: '2026-11-05T19:30:42.733Z'
---

## Overview

The Private Internet Access Extension for Firefox contains an unguarded onAuthRequired authentication handler, leading to leakage of PIA proxy credentials when a user visits any malicious website that issues a Basic auth challenge. This issue was fixed in version 3.2.5, but reintroduced in later versions.

## Affected

- `firefox_extension >= 3.2.5 <= 4.0.5`

## Remediation

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