Mozilla: CSP bypass due to permissive Reader mode whitelist (MFSA 2015-118)
Published Nov 5, 2015
4.3
MEDIUMCVSS 2.0
EPSS 2.28%
Description
The Reader View implementation in Mozilla Firefox before 42.0 has an improper whitelist, which makes it easier for remote attackers to bypass the Content Security Policy (CSP) protection mechanism and conduct cross-site scripting (XSS) attacks via vectors involving SVG animations and the about:reader URL.
Affected products
No data.
No data.
Red Hat Enterprise Linux 5
firefox
Not affected
Red Hat Enterprise Linux 5
thunderbird
Not affected
Red Hat Enterprise Linux 6
firefox
Not affected
Red Hat Enterprise Linux 6
thunderbird
Not affected
Red Hat Enterprise Linux 7
firefox
Not affected
Red Hat Enterprise Linux 7
thunderbird
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 5 | thunderbird | Not affected | n/a |
| Red Hat Enterprise Linux 6 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 6 | thunderbird | Not affected | n/a |
| Red Hat Enterprise Linux 7 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 7 | thunderbird | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue does not affect the version of firefox and thunderbird as shipped with Red Hat Enterprise Linux 5, 6 and 7.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.28% (0.02282) | 82.53th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.28% (0.02282) | 80.83th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.57% (0.00568) | 66.60th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.30% (0.00296) | 70.16th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.30% (0.00296) | 68.50th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.30% (0.00296) | 64.49th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.41% (0.01408) | 72.89th | v2 (v2022.01.01) |
| Mar 2, 2023 | 1.41% (0.01408) | 72.88th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.41% (0.01408) | 70.87th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.41% (0.01408) | 49.94th | v2 (v2022.01.01) |
References (13)
- http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00015.html vendor-advisoryx_refsource_SUSE
- http://www.mozilla.org/security/announce/2015/mfsa2015-118.html x_refsource_CONFIRMVendor Advisory
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html x_refsource_CONFIRM
- http://www.securitytracker.com/id/1034069 vdb-entryx_refsource_SECTRACK
- http://www.ubuntu.com/usn/USN-2785-1 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2015-4518 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1136692 x_refsource_CONFIRM
- https://bugzilla.mozilla.org/show_bug.cgi?id=1182778 x_refsource_CONFIRM
- https://bugzilla.redhat.com/show_bug.cgi?id=1277339 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2015-4518
- https://security.gentoo.org/glsa/201512-10 vendor-advisoryx_refsource_GENTOO
- https://www.cve.org/CVERecord?id=CVE-2015-4518
- https://www.mozilla.org/security/announce/2015/mfsa2015-118.html
| Link | Providers | Tags |
|---|---|---|
| http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00015.html | vendor-advisoryx_refsource_SUSE | |
| http://www.mozilla.org/security/announce/2015/mfsa2015-118.html | x_refsource_CONFIRMVendor Advisory | |
| http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html | x_refsource_CONFIRM | |
| http://www.securitytracker.com/id/1034069 | vdb-entryx_refsource_SECTRACK | |
| http://www.ubuntu.com/usn/USN-2785-1 | vendor-advisoryx_refsource_UBUNTU | |
| https://access.redhat.com/security/cve/CVE-2015-4518 | Vendor Advisory | |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1136692 | x_refsource_CONFIRM | |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1182778 | x_refsource_CONFIRM | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1277339 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2015-4518 | ||
| https://security.gentoo.org/glsa/201512-10 | vendor-advisoryx_refsource_GENTOO | |
| https://www.cve.org/CVERecord?id=CVE-2015-4518 | ||
| https://www.mozilla.org/security/announce/2015/mfsa2015-118.html |
Change history (0)
No recorded changes yet.