CVE-2009-4100 json
Yoono extension before 6.1.1 for Firefox performs certain operations with chrome privileges, which allows user-assisted remote attackers to…
published 2009-11-28 16 y ago modified 2026-06-16 4 mo ago also EUVD-2009-4071
- cvss
- 9.3
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.9%
- EPSS 3.9% chance of exploitation in 30 days, percentile 90%
- public exploits
- 0
- none known
Summary
Yoono extension before 6.1.1 for Firefox performs certain operations with chrome privileges, which allows user-assisted remote attackers to execute arbitrary commands and perform cross-domain scripting attacks via DOM event handlers such as onload.
Exploit prediction
3.87% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 9.3 | AV:N/AC:M/Au:N/C:C/I:C/A:C |
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
vupen.com
/english/advisories/2009/3326
vdb-entry, vendor-advisory
-
secunia.com
/advisories/37468
third-party-advisory, vendor-advisory
-
securityfocus.com
/bid/37123
vdb-entry
- addons.mozilla.org /en-US/firefox/addons/versions/1833#version-6.1.1
-
exchange.xforce.ibmcloud.com
/vulnerabilities/54417
vdb-entry
- net-security.org /secworld.php?id=8527
Sources
- CVE List CVE-2009-4100
- NVD CVE-2009-4100
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.