How severe is CVE-2006-4271?

CVE-2006-4271 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2006-4271 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2006-4271?

CVE-2006-4271 affects Jelsoft Vbulletin. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2006-4271?

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

When was CVE-2006-4271 published?

CVE-2006-4271 was published on 2006-08-21 and last updated on 2026-06-16.

CVE-2006-4271

CVE-2006-4271 is a high-severity vulnerability in Jelsoft Vbulletin with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Jelsoft Vbulletin
Published: 2006-08-21
Last modified: 2026-06-16

Description

PHP remote file inclusion vulnerability in install/upgrade_301.php in Jelsoft vBulletin 3.5.4 allows remote attackers to execute arbitrary PHP code via a URL in the step parameter. NOTE: the vendor has disputed this vulnerability, saying "The default vBulletin requires authentication prior to the usage of the upgrade system.

Frequently asked questions

What is CVE-2006-4271?: PHP remote file inclusion vulnerability in install/upgrade_301.php in Jelsoft vBulletin 3.5.4 allows remote attackers to execute arbitrary PHP code via a URL in the step parameter. NOTE: the vendor has disputed this vulnerability, saying "The default vBulletin requires authentication prior to the usage of the upgrade system.
How severe is CVE-2006-4271?: CVE-2006-4271 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2006-4271 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-4271?: CVE-2006-4271 affects Jelsoft Vbulletin. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2006-4271?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2006-4271 published?: CVE-2006-4271 was published on 2006-08-21 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:jelsoft:vbulletin:3.5.4:*:*:*:*:*:*:*

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