CVE-2009-4151

CVE-2009-4151 is a medium-severity vulnerability in Bestpractical Rt with a CVSS 2.0 base score of 5.8. 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-287.

Key facts

• Severity: Medium (CVSS 2.0 base score 5.8)
• EPSS exploit prediction: 2% (76th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-287
• Affected product: Bestpractical Rt
• Published: 2009-12-02
• Last modified: 2026-06-16

Description

Session fixation vulnerability in html/Elements/SetupSessionCookie in Best Practical Solutions RT 3.0.0 through 3.6.9 and 3.8.x through 3.8.5 allows remote attackers to hijack web sessions by setting the session identifier via a manipulation that leverages "HTTP access to the RT server," a related issue to CVE-2009-3585.

Frequently asked questions

What is CVE-2009-4151?

Session fixation vulnerability in html/Elements/SetupSessionCookie in Best Practical Solutions RT 3.0.0 through 3.6.9 and 3.8.x through 3.8.5 allows remote attackers to hijack web sessions by setting the session identifier via a manipulation that leverages "HTTP access to the RT server," a related issue to CVE-2009-3585.

How severe is CVE-2009-4151?

CVE-2009-4151 has a CVSS 2.0 base score of 5.8, rated medium severity.

Is CVE-2009-4151 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4151?

CVE-2009-4151 primarily affects Bestpractical Rt. In total, 40 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-4151?

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

When was CVE-2009-4151 published?

CVE-2009-4151 was published on 2009-12-02 and last updated on 2026-06-16.

References

• http://bestpractical.typepad.com/files/rt-3.0.0-session_fixation.v3.patch
• http://bestpractical.typepad.com/files/rt-3.0.1-3.0.6-session_fixation.v3.patch
• http://bestpractical.typepad.com/files/rt-3.0.7-3.6.1-session_fixation.v3.patch
• http://bestpractical.typepad.com/files/rt-3.6.2-3.6.3-session_fixation.v3.patch
• http://bestpractical.typepad.com/files/rt-3.6.4-3.6.9-session_fixation.v2.patch
• http://bestpractical.typepad.com/files/rt-3.8-session_fixation.patch
• http://blog.bestpractical.com/2009/11/session-fixation-vulnerability.html
• http://lists.bestpractical.com/pipermail/rt-announce/2009-November/000176.html
• http://lists.bestpractical.com/pipermail/rt-announce/2009-November/000177.html
• http://secunia.com/advisories/37546
• http://secunia.com/advisories/37728
• http://www.securityfocus.com/bid/37162
• https://exchange.xforce.ibmcloud.com/vulnerabilities/54472
• https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00761.html
• https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00794.html
• https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00832.html

Affected products (40)

• cpe:2.3:a:bestpractical:rt:3.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.0.4:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.0.5:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.0.6:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.0.7:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.0.7.1:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.0.8:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.0.9:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.0.10:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.0.11:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.0.12:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.2.1:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.2.2:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.2.3:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.4.1:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.4.2:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.4.3:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.4.4:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.4.5:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.4.6:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.6.0:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.6.1:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.6.2:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.6.3:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.6.4:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.6.5:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.6.6:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.6.7:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.6.8:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.6.9:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.8.0:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.8.1:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.8.2:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.8.3:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.8.4:*:*:*:*:*:*:*
• cpe:2.3:a:bestpractical:rt:3.8.5:*:*:*:*:*:*:*

More vulnerabilities in Bestpractical Rt

• CVE-2011-5092 — High (CVSS 7.5): Best Practical Solutions RT 3.8.x before 3.8.12 and 4.x before 4.0.6 allows remote attackers to execute arbitrary code…
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• CVE-2012-4732 — Medium (CVSS 6.8): Cross-site request forgery (CSRF) vulnerability in Request Tracker (RT) 3.8.12 and other versions before 3.8.15, and…
• CVE-2011-4458 — Medium (CVSS 6.8): Best Practical Solutions RT 3.6.x, 3.7.x, and 3.8.x before 3.8.12 and 4.x before 4.0.6, when the VERPPrefix and…
• CVE-2011-2085 — Medium (CVSS 6.8): Multiple cross-site request forgery (CSRF) vulnerabilities in Best Practical Solutions RT before 3.8.12 and 4.x before…
• CVE-2011-5093 — Medium (CVSS 6.5): Best Practical Solutions RT 4.x before 4.0.6 does not properly implement the DisallowExecuteCode option, which allows…

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Other CWE-287 (Improper Authentication) vulnerabilities

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• CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
• CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
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