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Fencer Vulns
high 7.5

CVE-2005-2261 json

Firefox before 1.0.5, Thunderbird before 1.0.5, Mozilla before 1.7.9, Netscape 8.0.2, and K-Meleon 0.9 runs XBL scripts even when Javascrip…

published 2005-07-13 21 y ago modified 2026-06-16 4 mo ago also EUVD-2005-2262

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.6%
EPSS 3.6% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

Firefox before 1.0.5, Thunderbird before 1.0.5, Mozilla before 1.7.9, Netscape 8.0.2, and K-Meleon 0.9 runs XBL scripts even when Javascript has been disabled, which makes it easier for remote attackers to bypass such protection.

Patch / fix

  • thunderbird RHEL 4 1.0.6-1.4.1
  • devhelp RHEL 4 0.9.2-2.4.6
  • firefox RHEL 4 1.0.6-1.4.1

red hat advisories RHSA-2005:601RHSA-2005:587RHSA-2005:586

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-2005-2261 updated

security flaw

  • Red Hat Enterprise Linux AS version 4 devhelp 0.9.2-2.4.6, firefox 1.0.6-1.4.1, thunderbird 1.0.6-1.4.1 Red Hat Enterprise Linux Desktop version 4 devhelp 0.9.2-2.4.6, firefox 1.0.6-1.4.1, thunderbird 1.0.6-1.4.1 Red Hat Enterprise Linux ES version 4 devhelp 0.9.2-2.4.6, firefox 1.0.6-1.4.1, thunderbird 1.0.6-1.4.1 Red Hat Enterprise Linux WS version 4 devhelp 0.9.2-2.4.6, firefox 1.0.6-1.4.1, thunderbird 1.0.6-1.4.1
    fixed: vendor fix RHSA-2005:587

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

3.59% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=292591 referenced PoC, tagged "exploit" by a source, unverified
  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=292589 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

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.