Description
Mozilla Firefox before 41.0 and Firefox ESR 38.x before 38.3 allow remote attackers to bypass CORS preflight protection mechanisms by leveraging (1) duplicate cache-key generation or (2) retrieval of a value from an incorrect HTTP Access-Control-* response header.
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 8 | iceweasel | 38.3.0esr-1~deb8u1 | DSA-3365-1 |
| Debian 7 | iceweasel | 38.3.0esr-1~deb7u1 | DSA-3365-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | firefox | 41.0+build3-0ubuntu0.14.04.1 | USN-2743-1 |
| Ubuntu 14.04 LTS | thunderbird | 1:38.3.0+build1-0ubuntu0.14.04.1 | USN-2754-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | firefox | 38.3.0-2.el7_1 | RHSA-2015:1834 |
| RHEL 7 | thunderbird | 38.3.0-1.ael7b_1 | RHSA-2015:1852 |
| RHEL 6 | firefox | 38.3.0-2.el6_7 | RHSA-2015:1834 |
| RHEL 6 | thunderbird | 38.3.0-1.el6_7 | RHSA-2015:1852 |
| RHEL 5 | firefox | 38.3.0-2.el5_11 | RHSA-2015:1834 |
| RHEL 5 | thunderbird | 38.3.0-1.el5_11 | RHSA-2015:1852 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhel Productivity 5 | thunderbird | 38.3.0-1.el5_11 | RHSA-2015:1852 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | MozillaFirefox | 38.3.0esr-48.1 | SUSE-SU-2015:1680-1 |
| SLES 12 | mozilla-nspr | 4.10.9-6.1 | SUSE-SU-2015:1680-1 |
| SLES 11 SP4 | MozillaFirefox | 38.3.0esr-22.1 | SUSE-SU-2015:1703-1 |
| SLES 11 SP3 | MozillaFirefox | 38.3.0esr-22.1 | SUSE-SU-2015:1703-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 | MozillaFirefox | 38.3.0esr-48.1 | SUSE-SU-2015:1680-1 |
| SLES for SAP 12 | mozilla-nspr | 4.10.9-6.1 | SUSE-SU-2015:1680-1 |
| SLES for SAP 11 SP4 | MozillaFirefox | 38.3.0esr-22.1 | SUSE-SU-2015:1703-1 |
| SLES for SAP 11 SP3 | MozillaFirefox | 38.3.0esr-22.1 | SUSE-SU-2015:1703-1 |
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 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | thunderbird | 38.3.0-1.0.1.el7_1 | ELSA-2015-1852 |
Advisories 11
- RHSA-2015:1852 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2015:1834 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-2754-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-2743-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3365-1 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-2015:1680-1 Security update for MozillaFirefox, mozilla-nspr SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2015:1703-1 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-2024:10071-1 MozillaFirefox-50.1.0-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ELSA-2015-1852 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 1, 2015
References
- http://www.mozilla.org/security/announce/2015/mfsa2015-111.html
- SUSE-SU-2015:1680 vendor-advisory
- SUSE-SU-2015:2081 vendor-advisory
- openSUSE-SU-2015:1681 vendor-advisory
- USN-2754-1 vendor-advisory
- USN-2743-4 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- USN-2743-3 vendor-advisory
- RHSA-2015:1834 vendor-advisory
- USN-2743-2 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1200856
- https://bugzilla.mozilla.org/show_bug.cgi?id=1200869
- 1033640 vdb-entry
- RHSA-2015:1852 vendor-advisory
- DSA-3365 vendor-advisory
- 76816 vdb-entry
- SUSE-SU-2015:1703 vendor-advisory
- openSUSE-SU-2015:1679 vendor-advisory
- openSUSE-SU-2015:1658 vendor-advisory
- USN-2743-1 vendor-advisory