Skip to content
Fencer Vulns
medium 6.8

CVE-2006-6503 json

Mozilla Firefox 2.x before 2.0.0.1, 1.5.x before 1.5.0.9, Thunderbird before 1.5.0.9, and SeaMonkey before 1.0.7 allows remote attackers to…

published 2006-12-20 19 y ago modified 2026-06-16 4 mo ago also EUVD-2006-6486

cvss
6.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.2%
EPSS 4.2% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

Mozilla Firefox 2.x before 2.0.0.1, 1.5.x before 1.5.0.9, Thunderbird before 1.5.0.9, and SeaMonkey before 1.0.7 allows remote attackers to bypass cross-site scripting (XSS) protection by changing the src attribute of an IMG element to a javascript: URI.

Patch / fix

  • mozilla firefox 1.5.0.9, 2.0.0.1
  • mozilla seamonkey 1.0.7
  • mozilla thunderbird 1.5.0.9
  • firefox-esr Debian 14, Debian 13, Debian 12 45.0esr-1

debian advisories DEBIAN-CVE-2006-6503

  • thunderbird RHEL 4 1.5.0.9-0.1.el4
  • seamonkey RHEL 2.1 1.0.7-0.1.el2
  • seamonkey RHEL 3 1.0.7-0.1.el3
  • seamonkey RHEL 4 1.0.7-0.1.el4
  • devhelp RHEL 4 0.10-0.6.el4
  • seamonkey-nss RHEL 2.1 1.0.7-0.1.el2
  • seamonkey-nss RHEL 3 1.0.7-0.1.el3
  • seamonkey-chat RHEL 2.1 1.0.7-0.1.el2

red hat advisories RHSA-2006:0760RHSA-2006:0759RHSA-2006:0758

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-2006-6503 updated

security flaw

  • Red Hat Desktop version 3 seamonkey 1.0.7-0.1.el3, seamonkey-nss 1.0.7-0.1.el3, seamonkey-chat 1.0.7-0.1.el3, seamonkey-mail 1.0.7-0.1.el3, seamonkey-nspr 1.0.7-0.1.el3, seamonkey-js-debugger 1.0.7-0.1.el3, +1 more Red Hat Enterprise Linux AS (Advanced Server) version 2.1 seamonkey 1.0.7-0.1.el2, seamonkey-nss 1.0.7-0.1.el2, seamonkey-chat 1.0.7-0.1.el2, seamonkey-mail 1.0.7-0.1.el2, seamonkey-nspr 1.0.7-0.1.el2, seamonkey-js-debugger 1.0.7-0.1.el2, +1 more Red Hat Enterprise Linux AS version 3 seamonkey 1.0.7-0.1.el3, seamonkey-nss 1.0.7-0.1.el3, seamonkey-chat 1.0.7-0.1.el3, seamonkey-mail 1.0.7-0.1.el3, seamonkey-nspr 1.0.7-0.1.el3, seamonkey-js-debugger 1.0.7-0.1.el3, +1 more Red Hat Enterprise Linux AS version 4 devhelp 0.10-0.6.el4, firefox 1.5.0.9-0.1.el4, seamonkey 1.0.7-0.1.el4, thunderbird 1.5.0.9-0.1.el4, seamonkey-chat 1.0.7-0.1.el4, seamonkey-mail 1.0.7-0.1.el4, +2 more Red Hat Enterprise Linux Desktop version 4 devhelp 0.10-0.6.el4, firefox 1.5.0.9-0.1.el4, seamonkey 1.0.7-0.1.el4, thunderbird 1.5.0.9-0.1.el4, seamonkey-chat 1.0.7-0.1.el4, seamonkey-mail 1.0.7-0.1.el4, +2 more Red Hat Enterprise Linux ES version 2.1 seamonkey 1.0.7-0.1.el2, seamonkey-nss 1.0.7-0.1.el2, seamonkey-chat 1.0.7-0.1.el2, seamonkey-mail 1.0.7-0.1.el2, seamonkey-nspr 1.0.7-0.1.el2, seamonkey-js-debugger 1.0.7-0.1.el2, +1 more
    +6 more products
    Red Hat Enterprise Linux ES version 3 seamonkey 1.0.7-0.1.el3, seamonkey-nss 1.0.7-0.1.el3, seamonkey-chat 1.0.7-0.1.el3, seamonkey-mail 1.0.7-0.1.el3, seamonkey-nspr 1.0.7-0.1.el3, seamonkey-js-debugger 1.0.7-0.1.el3, +1 more Red Hat Enterprise Linux ES version 4 devhelp 0.10-0.6.el4, firefox 1.5.0.9-0.1.el4, seamonkey 1.0.7-0.1.el4, thunderbird 1.5.0.9-0.1.el4, seamonkey-chat 1.0.7-0.1.el4, seamonkey-mail 1.0.7-0.1.el4, +2 more Red Hat Enterprise Linux WS version 2.1 seamonkey 1.0.7-0.1.el2, seamonkey-nss 1.0.7-0.1.el2, seamonkey-chat 1.0.7-0.1.el2, seamonkey-mail 1.0.7-0.1.el2, seamonkey-nspr 1.0.7-0.1.el2, seamonkey-js-debugger 1.0.7-0.1.el2, +1 more Red Hat Enterprise Linux WS version 3 seamonkey 1.0.7-0.1.el3, seamonkey-nss 1.0.7-0.1.el3, seamonkey-chat 1.0.7-0.1.el3, seamonkey-mail 1.0.7-0.1.el3, seamonkey-nspr 1.0.7-0.1.el3, seamonkey-js-debugger 1.0.7-0.1.el3, +1 more Red Hat Enterprise Linux WS version 4 devhelp 0.10-0.6.el4, firefox 1.5.0.9-0.1.el4, seamonkey 1.0.7-0.1.el4, thunderbird 1.5.0.9-0.1.el4, seamonkey-chat 1.0.7-0.1.el4, seamonkey-mail 1.0.7-0.1.el4, +2 more Red Hat Linux Advanced Workstation 2.1 seamonkey 1.0.7-0.1.el2, seamonkey-nss 1.0.7-0.1.el2, seamonkey-chat 1.0.7-0.1.el2, seamonkey-mail 1.0.7-0.1.el2, seamonkey-nspr 1.0.7-0.1.el2, seamonkey-js-debugger 1.0.7-0.1.el2, +1 more
    fixed: vendor fix RHSA-2006:0759

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

4.20% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness

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.