How severe is CVE-2009-4127?

CVE-2009-4127 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-2009-4127 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4127?

CVE-2009-4127 primarily affects Wikipedia Wikipedia Toolbar. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-4127?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2009-4127 published?

CVE-2009-4127 was published on 2009-12-02 and last updated on 2026-06-16.

CVE-2009-4127

CVE-2009-4127 is a critical-severity vulnerability in Wikipedia Wikipedia Toolbar with a CVSS 2.0 base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Wikipedia Wikipedia Toolbar
Published: 2009-12-02
Last modified: 2026-06-16

Description

Unspecified vulnerability in Wikipedia Toolbar extension before 0.5.9.2 for Firefox allows user-assisted remote attackers to execute arbitrary JavaScript with Chrome privileges via vectors involving unspecified Toolbar buttons and the eval function. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.

Frequently asked questions

What is CVE-2009-4127?: Unspecified vulnerability in Wikipedia Toolbar extension before 0.5.9.2 for Firefox allows user-assisted remote attackers to execute arbitrary JavaScript with Chrome privileges via vectors involving unspecified Toolbar buttons and the eval function. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
How severe is CVE-2009-4127?: CVE-2009-4127 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-2009-4127 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-4127?: CVE-2009-4127 primarily affects Wikipedia Wikipedia Toolbar. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-4127?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2009-4127 published?: CVE-2009-4127 was published on 2009-12-02 and last updated on 2026-06-16.

References

Affected products (26)

cpe:2.3:a:wikipedia:wikipedia_toolbar:*:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.2:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.4:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.4.1:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.4.2:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.4.4:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.4.5:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.4.6:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.4.9:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.5:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.5.0.1:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.5.0.2:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.5.0.3:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.5.0.4:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.5.0.6:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.5.0.7:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.5.0.8:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.5.1:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.5.2:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.5.3:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.5.4:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.5.5:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.5.6:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.5.7:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.5.8:*:*:*:*:*:*:*
cpe:2.3:a:wikipedia:wikipedia_toolbar:0.5.9:*:*:*:*:*:*:*

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