CVE-2026-6765

MEDIUM

Published Apr 21, 2026 Modified Apr 22, 2026 CWE-359

Description

Information disclosure in the Form Autofill component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS — Exploit Prediction

0.0004

Probability of exploitation

0.13%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-359 CWE-359

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 140.10.0
mozilla	firefox	< 150.0
mozilla	thunderbird	< 140.10.0

References

Advisories & Patches

https://www.mozilla.org/security/advisories/mfsa2026-30/ https://www.mozilla.org/security/advisories/mfsa2026-32/ https://www.mozilla.org/security/advisories/mfsa2026-33/ https://www.mozilla.org/security/advisories/mfsa2026-34/

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=2022419

Frequently Asked Questions

What is CVE-2026-6765? +

Information disclosure in the Form Autofill component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-6765? +

CVE-2026-6765 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0004, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-6765? +

CVE-2026-6765 affects products from mozilla, specifically: firefox, thunderbird. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-6765? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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Quick Facts

CVSS Score: 5.3
Severity: MEDIUM
EPSS: 0.0004
Published: Apr 21, 2026

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