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Fencer Vulns
medium 5.4

CVE-2009-1839 json

Mozilla Firefox 3 before 3.0.11 associates an incorrect principal with a file: URL loaded through the location bar, which allows user-assis…

published 2009-06-12 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-1834

cvss
5.4
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
7.1%
EPSS 7.1% chance of exploitation in 30 days, percentile 94%
public exploits
1
Exploit-DB

Summary

Mozilla Firefox 3 before 3.0.11 associates an incorrect principal with a file: URL loaded through the location bar, which allows user-assisted remote attackers to bypass intended access restrictions and read files via a crafted HTML document, aka a "file-URL-to-file-URL scripting" attack.

Patch / fix

  • firefox RHEL 4 3.0.11-4.el4
  • firefox RHEL 5 3.0.11-2.el5_3
  • xulrunner RHEL 5 1.9.0.11-3.el5_3
  • xulrunner-devel-unstable RHEL 5 1.9.0.11-3.el5_3

red hat advisories RHSA-2009:1095

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-2009-1839 updated cvss 1.2

Firefox information disclosure flaw

  • Red Hat Enterprise Linux (v. 5 server) firefox 3.0.11-2.el5_3, xulrunner 1.9.0.11-3.el5_3, xulrunner-devel-unstable 1.9.0.11-3.el5_3 Red Hat Enterprise Linux AS version 4 firefox 3.0.11-4.el4 Red Hat Enterprise Linux Desktop (v. 5 client) firefox 3.0.11-2.el5_3, xulrunner 1.9.0.11-3.el5_3, xulrunner-devel-unstable 1.9.0.11-3.el5_3 Red Hat Enterprise Linux Desktop version 4 firefox 3.0.11-4.el4 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) xulrunner 1.9.0.11-3.el5_3, xulrunner-devel-unstable 1.9.0.11-3.el5_3 Red Hat Enterprise Linux ES version 4 firefox 3.0.11-4.el4
    +1 more products
    Red Hat Enterprise Linux WS version 4 firefox 3.0.11-4.el4
    fixed: vendor fix RHSA-2009:1095

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

Timeline

  1. Published
  2. First public exploit (EDB-10544)

Exploit prediction

7.12% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-10544 Mozilla Firefox - Location Bar Spoofing local, 2009-12-18

CVSS scores

assigned by version score vector
NVD 2.0 5.4 AV:N/AC:H/Au:N/C:C/I:N/A:N

Classification

Weakness
  • CWE-264 Permissions, Privileges, and Access Controls

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.