Homepage

Cross-site Scripting (XSS) Affecting firefox-esr package, versions <45.3.0esr-1

Severity

 Recommended
0.0
medium
0
10

Snyk's Security Team recommends NVD's CVSS assessment. Learn more

Threat Intelligence

EPSS
1.25% (66th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-ECHOLATEST-FIREFOXESR-18168612
  • published22 Jul 2026
  • disclosed5 Aug 2016
Report a new vulnerability Found a mistake?

Introduced: 5 Aug 2016

CVE-2016-5265  (opens in a new tab)
CWE-79  (opens in a new tab)
CWE-200  (opens in a new tab)

How to fix?

Upgrade Echo:latest firefox-esr to version 45.3.0esr-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox-esr package and not the firefox-esr package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

Mozilla Firefox before 48.0 and Firefox ESR 45.x before 45.3 allow user-assisted remote attackers to bypass the Same Origin Policy, and conduct Universal XSS (UXSS) attacks or read arbitrary files, by arranging for the presence of a crafted HTML document and a crafted shortcut file in the same local directory.