CVE-2011-4718

CVE-2011-4718 is a medium-severity vulnerability in Php with a CVSS 2.0 base score of 6.8. 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-264.

Key facts

• Severity: Medium (CVSS 2.0 base score 6.8)
• EPSS exploit prediction: 4% (88th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-264
• Affected product: Php
• Published: 2013-08-13
• Last modified: 2026-06-16

Description

Session fixation vulnerability in the Sessions subsystem in PHP before 5.5.2 allows remote attackers to hijack web sessions by specifying a session ID.

Frequently asked questions

What is CVE-2011-4718?

Session fixation vulnerability in the Sessions subsystem in PHP before 5.5.2 allows remote attackers to hijack web sessions by specifying a session ID.

How severe is CVE-2011-4718?

CVE-2011-4718 has a CVSS 2.0 base score of 6.8, rated medium severity.

Is CVE-2011-4718 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4718?

CVE-2011-4718 primarily affects Php. In total, 100 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-4718?

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

When was CVE-2011-4718 published?

CVE-2011-4718 was published on 2013-08-13 and last updated on 2026-06-16.

References

• http://git.php.net/?p=php-src.git%3Ba=commit%3Bh=169b78eb79b0e080b67f9798708eb3771c6d0b2f
• http://git.php.net/?p=php-src.git%3Ba=commit%3Bh=25e8fcc88fa20dc9d4c47184471003f436927cde
• https://bugs.php.net/bug.php?id=60491
• https://wiki.php.net/rfc/strict_sessions

Affected products (100)

• cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.0.0:beta1:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.0.0:beta2:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.0.0:beta3:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.0.0:beta4:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.0.0:rc1:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.0.0:rc2:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.0.0:rc3:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.0.3:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.0.4:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.0.5:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.1.1:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.1.2:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.1.3:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.1.4:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.1.5:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.1.6:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.2.1:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.2.2:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.2.3:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.2.4:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.2.5:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.2.6:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.2.7:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.2.8:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.2.9:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.2.10:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.2.11:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.2.12:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.2.13:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.2.14:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.2.15:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.2.16:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.2.17:*:*:*:*:*:*:*
• cpe:2.3:a:php:php:5.3.0:*:*:*:*:*:*:*

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Other CWE-264 (Permissions, Privileges, and Access Controls) vulnerabilities

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• CVE-2015-7425 — Critical (CVSS 10.0): The Data Protection component in the VMware vSphere GUI in IBM Tivoli Storage Manager for Virtual Environments: Data…
• CVE-2015-8267 — Critical (CVSS 10.0): The PasswordReset.Controllers.ResetController.ChangePasswordIndex method in PasswordReset.dll in Dovestones AD Self…
• CVE-2015-7919 — Critical (CVSS 10.0): SearchBlox 8.3 before 8.3.1 allows remote attackers to write to the config file, and consequently cause a denial of…
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Browse all CWE-264 (Permissions, Privileges, and Access Controls) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

• 105.27.148.94 (ipv4-addr)
• 104.199.176.250 (ipv4-addr)
• 45.84.120.3 (ipv4-addr)
• 79.137.34.248 (ipv4-addr)
• 221.161.235.168 (ipv4-addr)
• 200.196.50.91 (ipv4-addr)
• 187.51.208.158 (ipv4-addr)
• 187.141.71.166 (ipv4-addr)