CVE-2026-100803
Fixed in a distro release EPSS <1%CVSS 8.1
Same-origin policy bypass in the WebExtensions component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Products: Mozilla Firefox, Mozilla Thunderbird
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian:12 | firefox-esr | 153.4.0esr-1~deb12u1 |
| Debian:12 | thunderbird | 1:140.17.0esr-1~deb12u1 |
| Debian:13 | firefox-esr | 153.4.0esr-1~deb13u1 |
| Debian:13 | thunderbird | 1:140.17.0esr-1~deb13u1 |
| Debian:14 | firefox-esr | 153.4.0esr-1 |
| Debian:14 | thunderbird | 1:153.4.0esr-1 |
| Rocky Linux:10 | firefox | 0:140.17.0-1.el10_2 |
| Rocky Linux:10 | thunderbird | 0:140.17.0-1.el10_2 |
| Rocky Linux:8 | firefox | 0:140.17.0-1.el8_10 |
| Rocky Linux:9 | firefox | 0:140.17.0-1.el9_8 |
| Rocky Linux:9 | thunderbird | 0:140.17.0-1.el9_8 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE:Linux Enterprise Module for Desktop Applications 15 SP7 | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE:Linux Enterprise Module for Package Hub 15 SP7 | MozillaThunderbird | 153.4.0-150400.13.6.1 |
| SUSE:Linux Enterprise Server 12 SP5-LTSS | MozillaFirefox | 153.4.0-118.11.1 |
| SUSE:Linux Enterprise Server 15 SP4-LTSS | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE:Linux Enterprise Server 15 SP5-LTSS | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE:Linux Enterprise Server 15 SP6-LTSS | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE:Linux Enterprise Server 16.0 | MozillaFirefox | 153.4.0-160000.1.1 |
| SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | MozillaFirefox | 153.4.0-118.11.1 |
| SUSE:Linux Enterprise Server for SAP Applications 15 SP4 | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE:Linux Enterprise Server for SAP Applications 15 SP5 | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE:Linux Enterprise Server for SAP Applications 15 SP6 | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE:Linux Enterprise Server for SAP applications 16.0 | MozillaFirefox | 153.4.0-160000.1.1 |
| SUSE:Linux Enterprise Workstation Extension 15 SP7 | MozillaThunderbird | 153.4.0-150400.13.6.1 |
| Ubuntu:18.04:LTS | mozjs38 | no fix |
| Ubuntu:18.04:LTS | mozjs52 | no fix |
| Ubuntu:20.04:LTS | mozjs52 | no fix |
| Ubuntu:20.04:LTS | mozjs68 | no fix |
| Ubuntu:22.04:LTS | mozjs102 | no fix |
| Ubuntu:22.04:LTS | mozjs78 | no fix |
| Ubuntu:22.04:LTS | mozjs91 | no fix |
| Ubuntu:22.04:LTS | thunderbird | no fix |
| Ubuntu:24.04:LTS | mozjs102 | no fix |
| Ubuntu:24.04:LTS | mozjs115 | no fix |
| openSUSE:Leap 16.0 | MozillaFirefox | 153.4.0-160000.1.1 |
| openSUSE:Tumbleweed | MozillaFirefox | 157.0.1-1.1 |
| openSUSE:Tumbleweed | MozillaThunderbird | 153.4.0-1.1 |
| openSUSE:Tumbleweed | firefox-esr | 153.4.0-1.1 |