Information disclosure in Mozilla Firefox
CVE-2025-8039
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.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (20.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Mozilla Firefox — versions 140.1, 141
- Mozilla Thunderbird — versions 140.1, 141
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required)
- www.mozilla.org/security/advisories/mfsa2025-56/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-59/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-61/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-63/ (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-8039?
- CVE-2025-8039 is a high-severity vulnerability in Mozilla Firefox, classified under Information Disclosure. CVSS score: 8.1/10. Published 2025-07-22.
- How severe is CVE-2025-8039?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2025-8039 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.