CVE-2009-4100
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.87%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 2.0
- 9.3 HIGHAV:N/AC:M/Au:N/C:C/I:C/A:C
- EPSS
- 3.87% probability · 90th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- yoono/yoono
- Source
- cve@mitre.org
EPSS 3.9% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://secunia.com/advisories/37468Vendor Advisory
- http://www.net-security.org/secworld.php?id=8527
- http://www.securityfocus.com/bid/37123
- http://www.vupen.com/english/advisories/2009/3326Vendor Advisory
- https://addons.mozilla.org/en-US/firefox/addons/versions/1833#version-6.1.1
- https://exchange.xforce.ibmcloud.com/vulnerabilities/54417
- http://secunia.com/advisories/37468Vendor Advisory
- http://www.net-security.org/secworld.php?id=8527
- http://www.securityfocus.com/bid/37123
- http://www.vupen.com/english/advisories/2009/3326Vendor Advisory
- https://addons.mozilla.org/en-US/firefox/addons/versions/1833#version-6.1.1
- https://exchange.xforce.ibmcloud.com/vulnerabilities/54417
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.