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Fencer Intel
medium 4.3

CVE-2012-1956 json

Mozilla Firefox before 15.0, Thunderbird before 15.0, and SeaMonkey before 2.12 do not prevent use of the Object.defineProperty method to s…

published 2012-08-29 14 y ago modified 2026-06-16 4 mo ago also EUVD-2012-1965

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

Mozilla Firefox before 15.0, Thunderbird before 15.0, and SeaMonkey before 2.12 do not prevent use of the Object.defineProperty method to shadow the location object (aka window.location), which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via vectors involving a plugin.

Patch / fix

  • thunderbird RHEL 5 PRODUCTIVITY, RHEL 5 10.0.8-1.el5_8
  • thunderbird RHEL 6 10.0.8-1.el6_3
  • firefox RHEL 5 10.0.8-1.el5_8
  • firefox RHEL 6 10.0.8-1.el6_3
  • xulrunner RHEL 5 10.0.8-1.el5_8
  • xulrunner RHEL 6 10.0.8-1.el6_3

red hat advisories RHSA-2012:1351RHSA-2012:1350

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 50.1.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 45.5.1-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10071-1openSUSE-SU-2024:10230-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2012-1956 updated cvss 4.3

Mozilla: Location object can be shadowed using Object.defineProperty (MFSA 2012-59)

  • Red Hat Enterprise Linux (v. 5 server) firefox 10.0.8-1.el5_8, xulrunner 10.0.8-1.el5_8 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 10.0.8-1.el5_8, xulrunner 10.0.8-1.el5_8, thunderbird 10.0.8-1.el5_8 Red Hat Enterprise Linux Desktop (v. 6) firefox 10.0.8-1.el6_3, xulrunner 10.0.8-1.el6_3, thunderbird 10.0.8-1.el6_3 Red Hat Enterprise Linux Desktop Optional (v. 6) xulrunner 10.0.8-1.el6_3 Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 10.0.8-1.el6_3, xulrunner 10.0.8-1.el6_3 Red Hat Enterprise Linux Server (v. 6) firefox 10.0.8-1.el6_3, xulrunner 10.0.8-1.el6_3
    +4 more products
    Red Hat Enterprise Linux Server Optional (v. 6) xulrunner 10.0.8-1.el6_3, thunderbird 10.0.8-1.el6_3 Red Hat Enterprise Linux Workstation (v. 6) firefox 10.0.8-1.el6_3, xulrunner 10.0.8-1.el6_3, thunderbird 10.0.8-1.el6_3 Red Hat Enterprise Linux Workstation Optional (v. 6) xulrunner 10.0.8-1.el6_3 Red Hat RHEL Desktop Workstation (v. 5 client) xulrunner 10.0.8-1.el5_8
    fixed: vendor fix RHSA-2012:1350
  • Red Hat RHEL Optional Productivity Applications (v. 5 server) thunderbird 10.0.8-1.el5_8
    fixed: vendor fix RHSA-2012:1351

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.89% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.