How severe is CVE-2006-5503?

CVE-2006-5503 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2006-5503 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2006-5503?

CVE-2006-5503 affects Simple Machines Simple Machines Forum. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2006-5503?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2006-5503 published?

CVE-2006-5503 was published on 2006-10-25 and last updated on 2026-06-16.

CVE-2006-5503

CVE-2006-5503 is a medium-severity vulnerability in Simple Machines Simple Machines Forum with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Simple Machines Simple Machines Forum
Published: 2006-10-25
Last modified: 2026-06-16

Description

Cross-site scripting (XSS) vulnerability in index.php in Simple Machines Forum (SMF) 1.1 RC2 allows remote attackers to inject arbitrary web script or HTML via the action parameter.

Frequently asked questions

What is CVE-2006-5503?: Cross-site scripting (XSS) vulnerability in index.php in Simple Machines Forum (SMF) 1.1 RC2 allows remote attackers to inject arbitrary web script or HTML via the action parameter.
How severe is CVE-2006-5503?: CVE-2006-5503 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2006-5503 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-5503?: CVE-2006-5503 affects Simple Machines Simple Machines Forum. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2006-5503?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2006-5503 published?: CVE-2006-5503 was published on 2006-10-25 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:simple_machines:simple_machines_forum:1.1_rc2:*:*:*:*:*:*:*

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