Description
Due to insufficient escaping of the ampersand character in the “Copy as cURL” feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system.
*This bug only affects Firefox for Windows. Other versions of Firefox are unaffected.*. This vulnerability was fixed in Firefox 139, Firefox ESR 115.24, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 115.24 |
| Mozilla | Thunderbird | — | 128.11 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | mozjs102 +1 | No fix yet | — |
| Ubuntu 22.04 LTS | mozjs78 +2 | No fix yet | — |
| Ubuntu 22.04 LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | USN-7663-1 |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SLES 15 SP7 | MozillaThunderbird | 128.11.0-150200.8.221.1 | SUSE-SU-2025:01946-1 |
| SLES 15 SP6 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SLES 15 SP6 | MozillaThunderbird | 128.11.0-150200.8.221.1 | SUSE-SU-2025:01946-1 |
| SLES 15 SP5 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SLES 15 SP4 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SLES 15 SP3 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 128.11.0-112.262.1 | SUSE-SU-2025:01769-1 |
| SLES for SAP 16.0 | mozjs128 | 128.14.0-160000.1.1 | SUSE-SU-2025:21170-1 |
| SLES for SAP 15 SP5 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SLES 16.0 | mozjs128 | 128.14.0-160000.1.1 | SUSE-SU-2025:21170-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 139.0.1-1.1 | openSUSE-SU-2025:15196-1 |
| openSUSE Tumbleweed | firefox-esr +1 | 128.11.0-1.1 | openSUSE-SU-2025:15174-1, openSUSE-SU-2025:15170-1 |
| openSUSE Tumbleweed | mozjs128 | 128.12.0-1.1 | openSUSE-SU-2025:15315-1 |
| openSUSE Leap 16.0 | mozjs128 | 128.14.0-160000.1.1 | openSUSE-SU-2025:20135-1 |
| openSUSE Leap 15.6 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 128.11.0-150200.8.221.1 | SUSE-SU-2025:01946-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | firefox | 128.11.0-1.amzn2023.0.2 | ALAS2023-2025-996 |
| Amazon Linux 2 | thunderbird | 128.11.0-1.amzn2.0.1 | ALAS2-2025-2873 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 128.11-r0 | — |
Advisories 14
- WID-SEC-2025-1160 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 10, 2026
- USN-7663-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- openSUSE-SU-2025:20135-1 Security update for mozjs128 SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15315-1 libmozjs-128-0-128.12.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15196-1 MozillaFirefox-139.0.1-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15174-1 MozillaThunderbird-128.11.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15170-1 firefox-esr-128.11.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:21170-1 Security update for mozjs128 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:01769-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:01946-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:01814-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-1850 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Nov 17, 2025
- ALAS2-2025-2873 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jun 12, 2025
- ALAS2023-2025-996 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jun 10, 2025
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1962301
- https://www.mozilla.org/security/advisories/mfsa2025-42/
- https://www.mozilla.org/security/advisories/mfsa2025-43/
- https://www.mozilla.org/security/advisories/mfsa2025-44/
- https://www.mozilla.org/security/advisories/mfsa2025-45/
- https://www.mozilla.org/security/advisories/mfsa2025-46/