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CVE-2012-3985

18
FAUCET Score

CVE-2012-3985 describes a cross-site scripting (XSS) vulnerability in Mozilla Firefox, Thunderbird, and SeaMonkey versions prior to 16.0, which stems from an improper implementation of the HTML5 Same Origin Policy. This flaw allows remote attackers to execute XSS attacks by exploiting initial-origin access after document.domain has been modified. The vulnerability has a CVSS score of 4.3, indicating a medium attack complexity and a potential impact of partial integrity compromise, with no confidentiality or availability impact. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 16.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
< 2.13CPE matchmatch criteria
cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
< 16.0CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
10.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:10.04:*:*:*:*:*:*:*
11.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:11.04:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.91%
Probability of exploitation in next 30 days
EPSS Percentile
77.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0191 is in the 60th percentile among its peer group of 19,955 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Vendor Patches (1)

mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2012-3985Moderate

Mozilla: Continued access to initial origin after setting document.domain can lead to XSS attacks (MFSA 2012-76)

Oct 9, 2012

References

lists.opensuse.org / opensuse-security-announce/2012-10/msg00010.html
Mailing ListThird Party Advisory
osvdb.org / 86106
Broken Link
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingVendor Advisory
secunia.com / advisories/50856
Broken Link
secunia.com / advisories/50892
Broken Link
secunia.com / advisories/50904
Broken Link
secunia.com / advisories/50935
Broken Link
secunia.com / advisories/50984
Broken Link
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16108
Third Party Advisory
mozilla.org / security/announce/2012/mfsa2012-76.html
Vendor Advisory
ubuntu.com / usn/USN-1611-1
Third Party Advisory