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CVE-2015-7188

22
FAUCET Score

CVE-2015-7188 is a Same-Origin Policy bypass vulnerability affecting Mozilla Firefox versions prior to 42.0 and Firefox ESR 38.x before 38.4. This flaw allows remote attackers to conduct cross-site scripting (XSS) attacks by appending whitespace to an IP address string. With a CVSS score of 7.5, this vulnerability is considered highly severe, requiring no authentication and having low attack complexity, potentially leading to partial compromise of confidentiality, integrity, and availability. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered some community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 41.0.2CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
38.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:38.0:*:*:*:*:*:*:*
38.0.1CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:38.0.1:*:*:*:*:*:*:*
38.0.5CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:38.0.5:*:*:*:*:*:*:*
38.1.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:38.1.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

AV:N/AC:L/Au:N/C:P/I:P/A:P

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.10%
Probability of exploitation in next 30 days
EPSS Percentile
86.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0310 is in the 76th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: firefox-0:38.4.0-1.el5_11
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: firefox-0:38.4.0-1.el6_7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: firefox-0:38.4.0-1.el7_1
View patch
mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2015-7188Moderate

Mozilla: Trailing whitespace in IP address hostnames can bypass same-origin policy (MFSA 2015-122)

Nov 4, 2015

References

lists.opensuse.org / opensuse-security-announce/2015-11/msg00013.html
lists.opensuse.org / opensuse-security-announce/2015-11/msg00015.html
lists.opensuse.org / opensuse-security-announce/2015-11/msg00020.html
lists.opensuse.org / opensuse-security-announce/2015-11/msg00021.html
lists.opensuse.org / opensuse-security-announce/2015-11/msg00025.html
lists.opensuse.org / opensuse-updates/2015-12/msg00037.html
lists.opensuse.org / opensuse-updates/2015-12/msg00049.html
rhn.redhat.com / errata/RHSA-2015-1982.html
bugzilla.mozilla.org / show_bug.cgi
security.gentoo.org / glsa/201512-10
debian.org / security/2015/dsa-3393
debian.org / security/2015/dsa-3410
mozilla.org / security/announce/2015/mfsa2015-122.html
Vendor Advisory
oracle.com / technetwork/topics/security/bulletinapr2016-2952098.html
oracle.com / technetwork/topics/security/linuxbulletinoct2015-2719645.html
securityfocus.com / bid/77411
securitytracker.com / id/1034069
ubuntu.com / usn/USN-2785-1
ubuntu.com / usn/USN-2819-1