CVE-2009-4100

9.3 HIGH 4% exploit odds Fix listed

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
Exploit odds: 3.9% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2009-11-29 13:08 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 23:13 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 3.9% in the next 30 days (EPSS).
Severity: 9.3 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2009-11-29 13:08 UTC
Last modified: 2026-06-16 23:13 UTC
Exploit probability: 3.9% · EPSS, next 30 days
Weakness: CWE-20 · Improper input validation
Record status: Modified

Affected

Yoono ≤ 6.1.0
Yoono 2.0.2.474
Yoono 2.0.3.564
Yoono 2.0.4.641
Yoono 2.1.0.743
Yoono 2.2.1.1038
Yoono 3.0.0.1268
Yoono 3.0.0.1270

Attack profile CVSS 2.0 · 9.3

Attack vector: Network
Complexity: Medium
Authentication: None
Confidentiality: Complete
Integrity: Complete
Availability: Complete

Raw vector

AV:N/AC:M/Au:N/C:C/I:C/A:C

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2009-4100.md and follow it. Check whether this project is affected by CVE-2009-4100. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record