Mozilla: Mozilla Content Security Policy allows for asterisk wildcards in violation of CSP specification (MFSA 2015-91)
Published Aug 16, 2015
4.3
MEDIUMCVSS 2.0
EPSS 2.95%
Description
The nsCSPHostSrc::permits function in dom/security/nsCSPUtils.cpp in Mozilla Firefox before 40.0 does not implement the Content Security Policy Level 2 exceptions for the blob, data, and filesystem URL schemes during wildcard source-expression matching, which might make it easier for remote attackers to conduct cross-site scripting (XSS) attacks by leveraging unexpected policy-enforcement behavior.
Affected products
No data.
Configuration 2
- 12.04
- 14.04
- 15.04
- 13.1
- 13.2
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 | 2.95% (0.02948) | 86.68th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.95% (0.02948) | 85.32th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.21% (0.00215) | 41.99th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.26% (0.00259) | 66.14th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.26% (0.00259) | 64.67th | v3 (v2023.03.01) |
| Apr 2, 2023 | 0.26% (0.00259) | 62.00th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.24% (0.00242) | 60.35th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.96% (0.01955) | 78.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.96% (0.01955) | 76.59th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.96% (0.01955) | 55.71th | v2 (v2022.01.01) |
References (15)
- http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00014.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00015.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://www.mozilla.org/security/announce/2015/mfsa2015-91.html x_refsource_CONFIRMVendor Advisory
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html x_refsource_CONFIRMThird Party Advisory
- http://www.securitytracker.com/id/1033247 vdb-entryx_refsource_SECTRACK
- http://www.ubuntu.com/usn/USN-2702-1 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- http://www.ubuntu.com/usn/USN-2702-2 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- http://www.ubuntu.com/usn/USN-2702-3 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2015-4490 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1086999 x_refsource_CONFIRMIssue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=1252294 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2015-4490
- https://security.gentoo.org/glsa/201605-06 vendor-advisoryx_refsource_GENTOO
- https://www.cve.org/CVERecord?id=CVE-2015-4490
- https://www.mozilla.org/security/announce/2015/mfsa2015-91.html
Change history (0)
No recorded changes yet.