CVE-2023-23603 Affecting firefox-esr package, versions <102.7.0esr-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.64% (46th percentile)

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  • Snyk IDSNYK-ECHOLATEST-FIREFOXESR-18169403
  • published22 Jul 2026
  • disclosed2 Jun 2023

Introduced: 2 Jun 2023

CVE-2023-23603  (opens in a new tab)

How to fix?

Upgrade Echo:latest firefox-esr to version 102.7.0esr-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.

Regular expressions used to filter out forbidden properties and values from style directives in calls to console.log weren't accounting for external URLs. Data could then be potentially exfiltrated from the browser. This vulnerability affects Firefox < 109, Firefox ESR < 102.7, and Thunderbird < 102.7.

CVSS Base Scores

version 3.1