CVE-2025-8036

Name: CVE-2025-8036
Creator: NVD / NIST
Published: 2025-07-22T21:15:50.76+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 0.42%

Last modified Jun 17, 2026

CVE-2025-8036 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. Thunderbird cached CORS preflight responses across IP address changes. This allowed circumventing CORS with DNS rebinding. EPSS estimates a 0.42% chance of exploitation in the next 30 days.

Description

Thunderbird cached CORS preflight responses across IP address changes. This allowed circumventing CORS with DNS rebinding. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1.

Metrics

CVSS 3.1

8.1/10

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

EPSS Probability

0.42%

33.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-350

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 140.1.0
Mozilla	Firefox	< 141.0
Mozilla	Thunderbird	< 140.1.0
Mozilla	Thunderbird	< 141.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1960834Permissions Required
https://www.mozilla.org/security/advisories/mfsa2025-56/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-59/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-61/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-63/Vendor Advisory
https://www.kb.cert.org/vuls/id/652514

Timeline

Published: Jul 22, 2025
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2025-8036?

How severe is CVE-2025-8036?

CVE-2025-8036 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.42% probability of exploitation in the next 30 days.

How do I fix CVE-2025-8036?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-8036?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST