How severe is CVE-2005-4891?

CVE-2005-4891 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2005-4891 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2005-4891?

CVE-2005-4891 affects Simplemachines Simple Machine Forum. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2005-4891?

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-2005-4891 published?

CVE-2005-4891 was published on 2020-01-15 and last updated on 2026-06-16.

CVE-2005-4891

CVE-2005-4891 is a critical-severity vulnerability in Simplemachines Simple Machine Forum with a CVSS 3.x base score of 9.8. 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-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-89
Affected product: Simplemachines Simple Machine Forum
Published: 2020-01-15
Last modified: 2026-06-16

Description

Simple Machine Forum (SMF) versions 1.0.4 and earlier have an SQL injection vulnerability that allows remote attackers to inject arbitrary SQL statements.

Frequently asked questions

What is CVE-2005-4891?: Simple Machine Forum (SMF) versions 1.0.4 and earlier have an SQL injection vulnerability that allows remote attackers to inject arbitrary SQL statements.
How severe is CVE-2005-4891?: CVE-2005-4891 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2005-4891 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2005-4891?: CVE-2005-4891 affects Simplemachines Simple Machine Forum. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2005-4891?: 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-2005-4891 published?: CVE-2005-4891 was published on 2020-01-15 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:simplemachines:simple_machine_forum:*:*:*:*:*:*:*:*

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