CVE-2026-6753

HIGH 7.3

Incorrect boundary conditions in the WebRTC component

CVSS Score

7.3

EPSS Score

0.1%

EPSS Percentile

20th

Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Vendor	mozilla
Product	firefox
Ecosystems	Browser JavaScript
Industries	Technology
Published	Apr 21, 2026
Last Updated	May 27, 2026

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Affected Versions

Mozilla / Firefox

All versions affected

Mozilla / Thunderbird

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=2027501 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-30/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-32/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-33/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-34/

Credits

jmwebdevelopement