Description
A possible vulnerability exists where type confusion can occur when manipulating JavaScript objects in object groups, allowing for the bypassing of security checks within these groups. *Note: this vulnerability has only been demonstrated with UnboxedObjects, which are disabled by default on all supported releases.*. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 60.7 | 60.7 |
| Mozilla | Firefox | unspecified – < 67 | 67 |
| Mozilla | Firefox ESR | unspecified – < 60.7 | 60.7 |
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.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | firefox-esr | 60.7.0esr-1 | — |
| Debian 14 | thunderbird | 1:60.7.0-1 | — |
| Debian 13 | firefox-esr | 60.7.0esr-1 | — |
| Debian 13 | thunderbird | 1:60.7.0-1 | — |
| Debian 12 | firefox-esr | 60.7.0esr-1 | — |
| Debian 12 | thunderbird | 1:60.7.0-1 | — |
| Debian 9 | firefox-esr | 60.7.0esr-1~deb9u1 | DSA-4448-1 |
| Debian 9 | thunderbird | 1:60.7.0-1~deb9u1 | DSA-4451-1 |
| Debian 8 | firefox-esr | 60.7.0esr-1~deb8u1 | DLA-1800-1 |
| Debian 8 | thunderbird | 1:60.7.0-1~deb8u1 | DLA-1806-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | mozjs52 | No fix yet | — |
| Ubuntu 18.04 LTS | firefox | 67.0+build2-0ubuntu0.18.04.1 | USN-3991-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | thunderbird | 1:60.7.0+build1-0ubuntu0.18.04.1 | USN-3997-1 |
| Ubuntu 16.04 LTS | firefox | 67.0+build2-0ubuntu0.16.04.1 | USN-3991-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:60.7.0+build1-0ubuntu0.16.04.1 | USN-3997-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | firefox | 60.7.0-1.el8_0 | RHSA-2019:1269 |
| RHEL 7 | firefox | 60.7.0-1.el7_6 | RHSA-2019:1265 |
| RHEL 6 | firefox | 60.7.0-1.el6_10 | RHSA-2019:1267 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | MozillaFirefox | 60.7.0-3.40.6 | SUSE-SU-2019:1405-1 |
| SLES 15 SP1 | MozillaThunderbird | 60.7.0-3.33.2 | SUSE-SU-2019:1458-1 |
| SLES 15 | MozillaFirefox | 60.7.0-3.40.6 | SUSE-SU-2019:1405-1 |
| SLES 15 | MozillaThunderbird | 60.7.0-3.33.2 | SUSE-SU-2019:1458-1 |
| SLES 12 SP4 | MozillaFirefox | 60.7.0-109.72.1 | SUSE-SU-2019:1388-1 |
| SLES 12 SP3 | MozillaFirefox | 60.7.0-109.72.1 | SUSE-SU-2019:1388-1 |
| SLES 12 SP2 | MozillaFirefox | 60.7.0-109.72.1 | SUSE-SU-2019:1388-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | MozillaFirefox | 60.7.0-109.72.1 | SUSE-SU-2019:1388-1 |
| SLES 12 | MozillaFirefox | 60.7.0-109.72.1 | SUSE-SU-2019:1388-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 60.7.0-109.72.1 | SUSE-SU-2019:1388-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 60.7.0-109.72.1 | SUSE-SU-2019:1388-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 60.7.0-109.72.1 | SUSE-SU-2019:1388-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 60.7.0-109.72.1 | SUSE-SU-2019:1388-1 |
| SUSE Package Hub 12 | MozillaThunderbird | 60.7.2-85.1 | openSUSE-SU-2019:1664-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox | 60.7.0-109.72.1 | SUSE-SU-2019:1388-1 |
| SUSE Enterprise Storage 4 | MozillaFirefox | 60.7.0-109.72.1 | SUSE-SU-2019:1388-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 92.0-1.2 | openSUSE-SU-2024:10600-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 91.1.1-1.1 | openSUSE-SU-2024:10601-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.0 | MozillaFirefox | 60.7.0-lp150.3.54.5 | openSUSE-SU-2019:1534-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.23 | firefox-esr | 60.7.0-r0 | — |
| Alpine v3.22 | firefox-esr | 60.7.0-r0 | — |
| Alpine v3.21 | firefox-esr | 60.7.0-r0 | — |
| Alpine v3.20 | firefox-esr | 60.7.0-r0 | — |
| Alpine v3.19 | firefox-esr | 60.7.0-r0 | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.18 | firefox-esr | 60.7.0-r0 | — |
| Alpine v3.17 | firefox-esr | 60.7.0-r0 | — |
| Alpine v3.16 | firefox-esr | 60.7.0-r0 | — |
| Alpine v3.15 | firefox-esr | 60.7.0-r0 | — |
| Alpine v3.14 | firefox-esr | 60.7.0-r0 | — |
| Alpine v3.13 | firefox-esr | 60.7.0-r0 | — |
| Alpine v3.12 | firefox-esr | 60.7.0-r0 | — |
| Alpine v3.11 | firefox-esr | 60.7.0-r0 | — |
| Alpine v3.10 | firefox-esr | 60.7.0-r0 | — |
| Alpine v3.9 | firefox-esr | 60.7.0-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | firefox | 60.7.0-1.0.2.el8_0 | ELSA-2019-1269 |
| Oracle Linux 7 | firefox | 60.7.0-1.0.1.el7_6 | ELSA-2019-1265 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- Spidermonkey - IonMonkey Unexpected ObjectGroup in ObjectGroupDispatch Operation EDB-46940 · dos · May 29, 2019 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 19
- RHSA-2019:1269 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2019:1267 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2019:1265 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-3997-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · May 29, 2026
- USN-3991-1 firefox vulnerabilities Ubuntu Security Notices (USN) · May 29, 2026
- DSA-4451-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4448-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1800-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1806-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2019:1458-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1534-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10600-1 MozillaFirefox-92.0-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1664-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1388-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1405-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ELSA-2019-1269 Critical: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 30, 2019
- ELSA-2019-1265 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 24, 2019