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Fencer Vulns
high 7.6

CVE-2009-3986 json

Mozilla Firefox before 3.0.16 and 3.5.x before 3.5.6, and SeaMonkey before 2.0.1, allows remote attackers to execute arbitrary JavaScript w…

published 2009-12-17 16 y ago modified 2026-06-16 4 mo ago also EUVD-2009-3957

cvss
7.6
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.7%
EPSS 3.7% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

Mozilla Firefox before 3.0.16 and 3.5.x before 3.5.6, and SeaMonkey before 2.0.1, allows remote attackers to execute arbitrary JavaScript with chrome privileges by leveraging a reference to a chrome window from a content window, related to the window.opener property.

Patch / fix

  • firefox RHEL 4 3.0.16-4.el4
  • firefox RHEL 5 3.0.16-1.el5_4
  • xulrunner RHEL 5 1.9.0.16-2.el5_4
  • xulrunner-devel-unstable RHEL 5 1.9.0.16-2.el5_4

red hat advisories RHSA-2009:1674

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-2009-3986 updated cvss 5.1

Mozilla Chrome privilege escalation via window.opener

  • Red Hat Enterprise Linux (v. 5 server) firefox 3.0.16-1.el5_4, xulrunner 1.9.0.16-2.el5_4, xulrunner-devel-unstable 1.9.0.16-2.el5_4 Red Hat Enterprise Linux AS version 4 firefox 3.0.16-4.el4 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 3.0.16-1.el5_4, xulrunner 1.9.0.16-2.el5_4, xulrunner-devel-unstable 1.9.0.16-2.el5_4 Red Hat Enterprise Linux Desktop version 4 firefox 3.0.16-4.el4 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) xulrunner 1.9.0.16-2.el5_4, xulrunner-devel-unstable 1.9.0.16-2.el5_4 Red Hat Enterprise Linux ES version 4 firefox 3.0.16-4.el4
    +1 more products
    Red Hat Enterprise Linux WS version 4 firefox 3.0.16-4.el4
    fixed: vendor fix RHSA-2009:1674

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

3.71% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 7.6 AV:N/AC:H/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code

References

Sources

Fencer Vulns 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.