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Fencer Vulns
medium 4.3

CVE-2006-1731 json

Mozilla Firefox and Thunderbird 1.x before 1.5 and 1.0.x before 1.0.8, Mozilla Suite before 1.7.13, and SeaMonkey before 1.0 returns the Ob…

published 2006-04-14 20 y ago modified 2026-06-16 4 mo ago also EUVD-2006-1731

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

Mozilla Firefox and Thunderbird 1.x before 1.5 and 1.0.x before 1.0.8, Mozilla Suite before 1.7.13, and SeaMonkey before 1.0 returns the Object class prototype instead of the global window object when (1) .valueOf.call or (2) .valueOf.apply are called without any arguments, which allows remote attackers to conduct cross-site scripting (XSS) attacks.

Patch / fix

  • thunderbird Debian 14, Debian 13, Debian 12 1.5.0.2-1

debian advisories DEBIAN-CVE-2006-1731

  • thunderbird RHEL 4 1.0.8-1.4.1
  • devhelp RHEL 4 0.9.2-2.4.8
  • firefox RHEL 4 1.0.8-1.4.1

red hat advisories RHSA-2006:0330RHSA-2006:0329RHSA-2006:0328

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-2006-1731 updated

security flaw

  • Red Hat Enterprise Linux AS version 4 devhelp 0.9.2-2.4.8, firefox 1.0.8-1.4.1, thunderbird 1.0.8-1.4.1 Red Hat Enterprise Linux Desktop version 4 devhelp 0.9.2-2.4.8, firefox 1.0.8-1.4.1, thunderbird 1.0.8-1.4.1 Red Hat Enterprise Linux ES version 4 devhelp 0.9.2-2.4.8, firefox 1.0.8-1.4.1, thunderbird 1.0.8-1.4.1 Red Hat Enterprise Linux WS version 4 devhelp 0.9.2-2.4.8, firefox 1.0.8-1.4.1, thunderbird 1.0.8-1.4.1
    fixed: vendor fix RHSA-2006:0329

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

1.82% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-08).

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 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.