CVE-2023-6208 Affecting firefox-esr package, versions <120.0-r0


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.77% (51st percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-FIREFOXESR-17764943
  • published1 Jul 2026
  • disclosed21 Nov 2023

Introduced: 21 Nov 2023

CVE-2023-6208  (opens in a new tab)

How to fix?

Upgrade Chainguard firefox-esr to version 120.0-r0 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 Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

When using X11, text selected by the page using the Selection API was erroneously copied into the primary selection, a temporary storage not unlike the clipboard. This bug only affects Firefox on X11. Other systems are unaffected. This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.

CVSS Base Scores

version 3.1