CVE-2025-8039

HIGH 8.1CVE-2025-8039 · Published 22/07/2025 · updated 05/10/2026

In short

CVE-2025-8039 is a HIGH (CVSS 8.1) vulnerability affecting firefox (mozilla), thunderbird (mozilla).
Chance of exploitation in the next 30 days (EPSS): 0.34%, higher than 27.7% of all vulnerabilities.
Fix: update to 140.1, 141.0 or later.

Package	Affected versions	Patched versions
firefox mozilla	`< 140.1< 141.0`	`140.1141.0`
thunderbird mozilla	`< 140.1< 141.0`	`140.1141.0`

Description

In some cases search terms persisted in the URL bar even after navigating away from the search page. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1.

References

bugzilla.mozilla.org/show_bug.cgi · Permissions Required
mozilla.org/security/advisories/mfsa2025-56 · Vendor Advisory
mozilla.org/security/advisories/mfsa2025-59 · Vendor Advisory
mozilla.org/security/advisories/mfsa2025-61 · Vendor Advisory
mozilla.org/security/advisories/mfsa2025-63 · Vendor Advisory

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Package

Affected versions

Patched versions

firefox

mozilla

< 140.1< 141.0

140.1141.0

thunderbird

mozilla

< 140.1< 141.0

140.1141.0

More vulnerabilities in firefox

See all →