kbrain

CVE-2009-4100

HIGH · CVSS 9.3EPSS 3.9%EU EUVD

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.

Key facts

CVSS score
9.3 (v2.0)
Severity
HIGH
CVSS vector
AV:N/AC:M/Au:N/C:C/I:C/A:C
Weakness (CWE)
CWE-20
EPSS score
3.9% (90th percentile)
In CISA KEV
No
In EU EUVD
Yes (EUVD-2009-4071)
Published
November 29, 2009
NVD last modified
June 16, 2026
Status
Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2009-4071 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.

View on the EU Vulnerability Database

Affected products

  • mozilla / firefox
  • yoono / yoono
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References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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