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Fencer Vulns
medium 4.3

CVE-2009-1309 json

Mozilla Firefox before 3.0.9, Thunderbird, and SeaMonkey do not properly implement the Same Origin Policy for (1) XMLHttpRequest, involving…

published 2009-04-22 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-1307

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

Mozilla Firefox before 3.0.9, Thunderbird, and SeaMonkey do not properly implement the Same Origin Policy for (1) XMLHttpRequest, involving a mismatch for a document's principal, and (2) XPCNativeWrapper.toString, involving an incorrect __proto__ scope, which allows remote attackers to conduct cross-site scripting (XSS) attacks and possibly other attacks via a crafted document.

Patch / fix

  • thunderbird RHEL 5 PRODUCTIVITY, RHEL 5 2.0.0.22-2.el5_3
  • thunderbird RHEL 4 1.5.0.12-23.el4
  • seamonkey RHEL 2.1 1.0.9-0.33.el2
  • seamonkey RHEL 3 1.0.9-0.37.el3
  • seamonkey RHEL 4 1.0.9-41.el4
  • seamonkey-nss RHEL 2.1 1.0.9-0.33.el2
  • seamonkey-nss RHEL 3 1.0.9-0.37.el3
  • seamonkey-chat RHEL 2.1 1.0.9-0.33.el2

red hat advisories RHSA-2009:1126RHSA-2009:1125RHSA-2009:0437RHSA-2009:0436

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

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

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-2009-1309 updated cvss 4.3

Firefox Same-origin violations in XMLHttpRequest and XPCNativeWrapper.toString

  • Red Hat Desktop version 3 seamonkey 1.0.9-0.37.el3, seamonkey-nss 1.0.9-0.37.el3, seamonkey-chat 1.0.9-0.37.el3, seamonkey-mail 1.0.9-0.37.el3, seamonkey-nspr 1.0.9-0.37.el3, seamonkey-js-debugger 1.0.9-0.37.el3, +1 more
    fixed: vendor fix RHSA-2009:0437
  • Red Hat Enterprise Linux (v. 5 server) firefox 3.0.9-1.el5, xulrunner 1.9.0.9-1.el5, xulrunner-devel-unstable 1.9.0.9-1.el5
    fixed: vendor fix RHSA-2009:0436
  • Red Hat Enterprise Linux AS (Advanced Server) version 2.1 seamonkey 1.0.9-0.33.el2, seamonkey-nss 1.0.9-0.33.el2, seamonkey-chat 1.0.9-0.33.el2, seamonkey-mail 1.0.9-0.33.el2, seamonkey-nspr 1.0.9-0.33.el2, seamonkey-js-debugger 1.0.9-0.33.el2, +1 more Red Hat Enterprise Linux AS version 3 seamonkey 1.0.9-0.37.el3, seamonkey-nss 1.0.9-0.37.el3, seamonkey-chat 1.0.9-0.37.el3, seamonkey-mail 1.0.9-0.37.el3, seamonkey-nspr 1.0.9-0.37.el3, seamonkey-js-debugger 1.0.9-0.37.el3, +1 more Red Hat Enterprise Linux AS version 4 firefox 3.0.9-1.el4, seamonkey 1.0.9-41.el4, seamonkey-chat 1.0.9-41.el4, seamonkey-mail 1.0.9-41.el4, thunderbird 1.5.0.12-23.el4, seamonkey-js-debugger 1.0.9-41.el4, +1 more
    fixed: vendor fix RHSA-2009:0437
  • Red Hat Enterprise Linux Desktop (v. 5 client) firefox 3.0.9-1.el5, xulrunner 1.9.0.9-1.el5, thunderbird 2.0.0.22-2.el5_3, xulrunner-devel-unstable 1.9.0.9-1.el5
    fixed: vendor fix RHSA-2009:0436
  • Red Hat Enterprise Linux Desktop version 4 firefox 3.0.9-1.el4, seamonkey 1.0.9-41.el4, seamonkey-chat 1.0.9-41.el4, seamonkey-mail 1.0.9-41.el4, thunderbird 1.5.0.12-23.el4, seamonkey-js-debugger 1.0.9-41.el4, +1 more
    fixed: vendor fix RHSA-2009:0437
  • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) xulrunner 1.9.0.9-1.el5, xulrunner-devel-unstable 1.9.0.9-1.el5
    fixed: vendor fix RHSA-2009:0436
  • Red Hat Enterprise Linux ES version 2.1 seamonkey 1.0.9-0.33.el2, seamonkey-nss 1.0.9-0.33.el2, seamonkey-chat 1.0.9-0.33.el2, seamonkey-mail 1.0.9-0.33.el2, seamonkey-nspr 1.0.9-0.33.el2, seamonkey-js-debugger 1.0.9-0.33.el2, +1 more Red Hat Enterprise Linux ES version 3 seamonkey 1.0.9-0.37.el3, seamonkey-nss 1.0.9-0.37.el3, seamonkey-chat 1.0.9-0.37.el3, seamonkey-mail 1.0.9-0.37.el3, seamonkey-nspr 1.0.9-0.37.el3, seamonkey-js-debugger 1.0.9-0.37.el3, +1 more Red Hat Enterprise Linux ES version 4 firefox 3.0.9-1.el4, seamonkey 1.0.9-41.el4, seamonkey-chat 1.0.9-41.el4, seamonkey-mail 1.0.9-41.el4, thunderbird 1.5.0.12-23.el4, seamonkey-js-debugger 1.0.9-41.el4, +1 more
    fixed: vendor fix RHSA-2009:0437
  • Red Hat Enterprise Linux Optional Productivity Applications (v. 5 server) thunderbird 2.0.0.22-2.el5_3
    fixed: vendor fix RHSA-2009:1126
show 1 more
  • Red Hat Enterprise Linux WS version 2.1 seamonkey 1.0.9-0.33.el2, seamonkey-nss 1.0.9-0.33.el2, seamonkey-chat 1.0.9-0.33.el2, seamonkey-mail 1.0.9-0.33.el2, seamonkey-nspr 1.0.9-0.33.el2, seamonkey-js-debugger 1.0.9-0.33.el2, +1 more Red Hat Enterprise Linux WS version 3 seamonkey 1.0.9-0.37.el3, seamonkey-nss 1.0.9-0.37.el3, seamonkey-chat 1.0.9-0.37.el3, seamonkey-mail 1.0.9-0.37.el3, seamonkey-nspr 1.0.9-0.37.el3, seamonkey-js-debugger 1.0.9-0.37.el3, +1 more Red Hat Enterprise Linux WS version 4 firefox 3.0.9-1.el4, seamonkey 1.0.9-41.el4, seamonkey-chat 1.0.9-41.el4, seamonkey-mail 1.0.9-41.el4, thunderbird 1.5.0.12-23.el4, seamonkey-js-debugger 1.0.9-41.el4, +1 more Red Hat Linux Advanced Workstation 2.1 seamonkey 1.0.9-0.33.el2, seamonkey-nss 1.0.9-0.33.el2, seamonkey-chat 1.0.9-0.33.el2, seamonkey-mail 1.0.9-0.33.el2, seamonkey-nspr 1.0.9-0.33.el2, seamonkey-js-debugger 1.0.9-0.33.el2, +1 more
    fixed: vendor fix RHSA-2009:0437

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

1.35% chance of exploitation in the next 30 days, higher than 71% 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

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.