CVE-2025-8029

Name: CVE-2025-8029
Creator: NVD / NIST
Published: 2025-07-22T21:15:50.057+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 0.31%

Last modified Jun 17, 2026

CVE-2025-8029 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. Thunderbird executed `javascript:` URLs when used in `object` and `embed` tags. This vulnerability was fixed in Firefox 141, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.. EPSS estimates a 0.31% chance of exploitation in the next 30 days.

Description

Thunderbird executed `javascript:` URLs when used in `object` and `embed` tags. This vulnerability was fixed in Firefox 141, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, 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

0.31%

22.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-80

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 128.13.0
Mozilla	Firefox	< 141.0
Mozilla	Firefox	>= 140.0, < 140.1.0
Mozilla	Thunderbird	< 128.13.0
Mozilla	Thunderbird	< 141.0
Mozilla	Thunderbird	>= 140.0, < 140.1.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1928021Permissions Required
https://www.mozilla.org/security/advisories/mfsa2025-56/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-58/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/mfsa2025-62/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-63/Vendor Advisory
https://lists.debian.org/debian-lts-announce/2025/07/msg00016.html

Timeline

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

Frequently Asked Questions

What is CVE-2025-8029?

How severe is CVE-2025-8029?

CVE-2025-8029 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.

How do I fix CVE-2025-8029?

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-2025-8029?

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

Scan your code now

Source: NVD / NIST