CVE-2025-8029: javascript: URLs executed on object and embed tags
Firefox executed javascript: URLs when used in object and embed tags.
Other sources
Thunderbird executed javascript: URLs when used in object and embed tags. This vulnerability affects Firefox < 141, Firefox ESR < 128.13, Firefox ESR < 140.1, Thunderbird < 141, Thunderbird < 128.13, and Thunderbird < 140.1.
— Red Hat
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.
— MITRE
Thunderbird executed javascript: URLs when used in object and embed tags.
— Mozilla
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 128.13 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 140.1 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 141 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 141 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 128.13 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 140.1 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 141 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 128.13 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 140.1
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2025-8029?
CVE-2025-8029 has been designated a high severity vulnerability due to the potential execution of malicious JavaScript.
How do I fix CVE-2025-8029?
To fix CVE-2025-8029, update to Mozilla Firefox version 141 or Firefox ESR version 128.13 or 140.1.
What versions of Firefox are affected by CVE-2025-8029?
CVE-2025-8029 affects Mozilla Firefox versions up to 141 and Firefox ESR versions up to 128.13 and 140.1.
What type of vulnerability is CVE-2025-8029?
CVE-2025-8029 is a JavaScript execution vulnerability caused by improper handling of javascript: URLs in object and embed tags.
Who should be concerned about CVE-2025-8029?
Users of affected versions of Mozilla Firefox and Firefox ESR should be concerned about CVE-2025-8029 and should upgrade their browsers.