Description
The navigator.sendBeacon implementation in Mozilla Firefox before 37.0, Firefox ESR 31.x before 31.6, and Thunderbird before 31.6 processes HTTP 30x status codes for redirects after a preflight request has occurred, which allows remote attackers to bypass intended CORS access-control checks and conduct cross-site request forgery (CSRF) attacks via a crafted web site, a similar issue to CVE-2014-8638.
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 7 | icedove | 31.6.0-1~deb7u1 | DSA-3212-1 |
| Debian 7 | iceweasel | 31.6.0esr-1~deb7u1 | DSA-3211-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | firefox | 37.0+build2-0ubuntu0.14.04.1 | USN-2550-1 |
| Ubuntu 14.04 LTS | thunderbird | 1:31.6.0+build1-0ubuntu0.14.04.1 | USN-2552-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | firefox +1 | 31.6.0-2.el7_1 | RHSA-2015:0766 |
| RHEL 7 | thunderbird | 31.6.0-1.ael7b_1 | RHSA-2015:0771 |
| RHEL 7 | xulrunner-devel | 31.6.0-2.ael7b_1 | RHSA-2015:0766 |
| RHEL 6 | firefox | 31.6.0-2.el6_6 | RHSA-2015:0766 |
| RHEL 6 | thunderbird | 31.6.0-1.el6_6 | RHSA-2015:0771 |
| RHEL 5 | firefox | 31.6.0-2.el5_11 | RHSA-2015:0766 |
| RHEL 5 | thunderbird | 31.6.0-1.el5_11 | RHSA-2015:0771 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhel Productivity 5 | thunderbird | 31.6.0-1.el5_11 | RHSA-2015:0771 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | MozillaFirefox | 31.6.0esr-30.1 | SUSE-SU-2015:0704-2, SUSE-SU-2015:0704-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 | MozillaFirefox | 31.6.0esr-30.1 | SUSE-SU-2015:0704-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 50.1.0-1.1 | openSUSE-SU-2024:10071-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 45.5.1-1.1 | openSUSE-SU-2024:10230-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
Advisories 11
- RHSA-2015:0771 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Aug 1, 2026
- RHSA-2015:0766 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Aug 1, 2026
- USN-2552-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-2550-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3212-1 icedove - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3211-1 iceweasel - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10230-1 MozillaThunderbird-45.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2015:0704-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2015:0704-2 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-2024:10071-1 MozillaFirefox-50.1.0-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
References
- 73457 vdb-entry
- 1031996 vdb-entry
- openSUSE-SU-2015:0892 vendor-advisory
- GLSA-201512-10 vendor-advisory
- DSA-3212 vendor-advisory
- SUSE-SU-2015:0704 vendor-advisory
- USN-2552-1 vendor-advisory
- RHSA-2015:0766 vendor-advisory
- http://www.mozilla.org/security/announce/2015/mfsa2015-37.html
- http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html
- openSUSE-SU-2015:1266 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1111834
- USN-2550-1 vendor-advisory
- 1032000 vdb-entry
- openSUSE-SU-2015:0677 vendor-advisory
- RHSA-2015:0771 vendor-advisory
- DSA-3211 vendor-advisory