CVE-2009-4100: n/a vulnerability

CVE-2009-4100: Yoono extension before 6.1.1 for Firefox performs certain operations with chrome privileges, which allows u...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 7, 2024, 06:54 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2009-4100 affects old Yoono Firefox extension versions before 6.1.1. A malicious page could abuse browser event handling to run actions with elevated browser extension privileges, potentially including arbitrary command execution. This is mainly a legacy risk if the extension remains installed on old Firefox profiles. Exposure is likely limited to legacy systems running Firefox with the Yoono extension below version 6.1.1. Modern environments are unlikely to be exposed unless old browser profiles, archived virtual desktops, or unmanaged endpoints still contain the vulnerable add-on. Treat this as a targeted legacy cleanup item, not a broad emergency. If Yoono before 6.1.1 exists on business systems, prioritize removal or update because the impact could include command execution under extension privileges. Mitigation focus: Inventory Firefox extensions across managed and legacy endpoints.; Remove Yoono where it is not required.; Update Yoono to version 6.1.1 or later if still available and supported..

Prepared: Jun 28, 2026, 13:13 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Nov 28, 2009, 11:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://addons.mozilla.org/en-US/firefox/addons/versions/1833#version-6.1.1CVE reference · x_refsource_CONFIRM
yoonoo-domevent-xss(54417)CVE reference · vdb-entry, x_refsource_XF

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

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