Description
Add-on updates failed to verify that the add-on ID inside the signed package matched the ID of the add-on being updated. An attacker who could perform a man-in-the-middle attack on the user's connection to the update server and defeat the certificate pinning protection could provide a malicious signed add-on instead of a valid update. This vulnerability affects Firefox ESR < 45.5 and Firefox < 50.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox ESR | unspecified – < 45.5 | 45.5 |
| Mozilla | Firefox | unspecified – < 50 | 50 |
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 | 45.5.0esr-1 | — |
| Debian 13 | firefox-esr | 45.5.0esr-1 | — |
| Debian 12 | firefox-esr | 45.5.0esr-1 | — |
| Debian 8 | firefox-esr | 45.5.0esr-1~deb8u1 | DSA-3716-1 |
| Debian 7 | firefox-esr | 45.5.1esr-1~deb7u1 | DLA-730-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | firefox | 50.0+build2-0ubuntu0.16.04.2 | USN-3124-1 |
| Ubuntu 14.04 LTS | firefox | 50.0+build2-0ubuntu0.14.04.2 | USN-3124-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | firefox | 45.5.0-1.el7_3 | RHSA-2016:2780 |
| RHEL 6 | firefox | 45.5.0-1.el6_8 | RHSA-2016:2780 |
| RHEL 5 | firefox | 45.5.0-1.el5_11 | RHSA-2016:2780 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | MozillaFirefox | 45.5.0esr-88.1 | SUSE-SU-2016:3014-1 |
| SLES 12 SP2 | mozilla-nss | 3.21.3-50.1 | SUSE-SU-2016:3014-1 |
| SLES 12 SP1 | MozillaFirefox | 45.5.0esr-88.1 | SUSE-SU-2016:3014-1 |
| SLES 12 SP1 | mozilla-nss | 3.21.3-50.1 | SUSE-SU-2016:3014-1 |
| SLES 12 | MozillaFirefox | 45.5.0esr-88.1 | SUSE-SU-2016:3014-1 |
| SLES 12 | mozilla-nss | 3.21.3-50.1 | SUSE-SU-2016:3014-1 |
| SLES 11 SP4 | MozillaFirefox | 45.5.1esr-59.1 | SUSE-SU-2016:3080-1 |
| SLES 11 SP4 | mozilla-nss | 3.21.3-39.1 | SUSE-SU-2016:3080-1 |
| SLES 11 SP3 | MozillaFirefox | 45.5.1esr-59.1 | SUSE-SU-2016:3080-1 |
| SLES 11 SP3 | mozilla-nss | 3.21.3-39.1 | SUSE-SU-2016:3080-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP2 | MozillaFirefox | 45.5.1esr-63.1 | SUSE-SU-2016:3105-1 |
| SLES 11 SP2 | mozilla-nss | 3.21.3-30.1 | SUSE-SU-2016:3105-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 45.5.0esr-88.1 | SUSE-SU-2016:3014-1 |
| SLES for SAP 12 SP2 | mozilla-nss | 3.21.3-50.1 | SUSE-SU-2016:3014-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 45.5.0esr-88.1 | SUSE-SU-2016:3014-1 |
| SLES for SAP 12 SP1 | mozilla-nss | 3.21.3-50.1 | SUSE-SU-2016:3014-1 |
| SLES for SAP 12 | MozillaFirefox | 45.5.0esr-88.1 | SUSE-SU-2016:3014-1 |
| SLES for SAP 12 | mozilla-nss | 3.21.3-50.1 | SUSE-SU-2016:3014-1 |
| SLES for SAP 11 SP4 | MozillaFirefox | 45.5.1esr-59.1 | SUSE-SU-2016:3080-1 |
| SLES for SAP 11 SP4 | mozilla-nss | 3.21.3-39.1 | SUSE-SU-2016:3080-1 |
| SUSE OpenStack Cloud 5 | MozillaFirefox | 45.5.1esr-59.1 | SUSE-SU-2016:3080-1 |
| SUSE OpenStack Cloud 5 | mozilla-nss | 3.21.3-39.1 | SUSE-SU-2016:3080-1 |
| SUSE Manager Proxy 2.1 | MozillaFirefox | 45.5.1esr-59.1 | SUSE-SU-2016:3080-1 |
| SUSE Manager Proxy 2.1 | mozilla-nss | 3.21.3-39.1 | SUSE-SU-2016:3080-1 |
| SUSE Manager 2.1 | MozillaFirefox | 45.5.1esr-59.1 | SUSE-SU-2016:3080-1 |
| SUSE Manager 2.1 | mozilla-nss | 3.21.3-39.1 | SUSE-SU-2016:3080-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | MozillaFirefox | 45.5.1esr-59.1 | SUSE-SU-2016:3080-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | mozilla-nss | 3.21.3-39.1 | SUSE-SU-2016:3080-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 50.1.0-1.1 | openSUSE-SU-2024:10071-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | firefox | 45.5.0-1.0.1.el7_3 | ELSA-2016-2780 |
Advisories 10
- RHSA-2016:2780 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-3124-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-730-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3716-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2016:3014-1 Security update for MozillaFirefox, mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:3080-1 Security update for MozillaFirefox, mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:3105-1 Security update for MozillaFirefox, mozilla-nss 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-2024:10071-1 MozillaFirefox-50.1.0-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ELSA-2016-2780 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 16, 2016
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1303418
- 1037298 vdb-entry
- GLSA-201701-15 vendor-advisory
- 94336 vdb-entry
- RHSA-2016:2780 vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2016-89/
- https://www.mozilla.org/security/advisories/mfsa2016-90/