How severe is CVE-2003-1131?

CVE-2003-1131 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2003-1131 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2003-1131?

CVE-2003-1131 primarily affects Activecampaign Knowledgebuilder. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2003-1131?

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-2003-1131 published?

CVE-2003-1131 was published on 2003-12-31 and last updated on 2026-06-16.

CVE-2003-1131

CVE-2003-1131 is a high-severity vulnerability in Activecampaign Knowledgebuilder 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: 3% (88th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Activecampaign Knowledgebuilder
Published: 2003-12-31
Last modified: 2026-06-16

Description

PHP remote file inclusion vulnerability in index.php in KnowledgeBuilder, referred to as KnowledgeBase, allows remote attackers to execute arbitrary PHP code by modifying the page parameter to reference a URL on a remote web server that contains the code.

Frequently asked questions

What is CVE-2003-1131?: PHP remote file inclusion vulnerability in index.php in KnowledgeBuilder, referred to as KnowledgeBase, allows remote attackers to execute arbitrary PHP code by modifying the page parameter to reference a URL on a remote web server that contains the code.
How severe is CVE-2003-1131?: CVE-2003-1131 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2003-1131 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2003-1131?: CVE-2003-1131 primarily affects Activecampaign Knowledgebuilder. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2003-1131?: 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-2003-1131 published?: CVE-2003-1131 was published on 2003-12-31 and last updated on 2026-06-16.

References

Affected products (4)

cpe:2.3:a:activecampaign:knowledgebuilder:2.0.1:*:*:*:*:*:*:*
cpe:2.3:a:activecampaign:knowledgebuilder:2.1.0:*:*:*:*:*:*:*
cpe:2.3:a:activecampaign:knowledgebuilder:2.1.4:*:*:*:*:*:*:*
cpe:2.3:a:activecampaign:knowledgebuilder:3.0.1:*:*:*:*:*:*:*

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CVE-2005-3828 — High (CVSS 7.5): SQL injection vulnerability in index.php in ActiveCampaign KnowledgeBuilder 2.4 and earlier allows remote attackers to…

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