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Vulnerability record · CVE-2015-4050 · published 2 June 2015

CVE-2015-4050: Sensiolabs symfony improper access control vulnerability

Sensiolabs · Symfony

FragmentListener in the HttpKernel component in Symfony 2.3.19 through 2.3.28, 2.4.9 through 2.4.10, 2.5.4 through 2.5.11, and 2.6.0 through 2.6.7, when ESI or SSI support enabled, does not check if the _controller attribute is set, which allows remote attackers to bypass URL signing and security rules by including (1) no hash or (2) an invalid hash in a request to /_fragment.

4.3 CVSS 2.0 Medium EPSS 8.2% · top 5.3% CWE-284 · Improper access control
4.3CVSS 2.0 base score
8.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

FragmentListener in the HttpKernel component in Symfony 2.3.19 through 2.3.28, 2.4.9 through 2.4.10, 2.5.4 through 2.5.11, and 2.6.0 through 2.6.7, when ESI or SSI support enabled, does not check if the _controller attribute is set, which allows remote attackers to bypass URL signing and security rules by including (1) no hash or (2) an invalid hash in a request to /_fragment.

AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159513.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159603.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159610.html
http://symfony.com/blog/cve-2015-4050-esi-unauthorized-access Vendor Advisory
http://www.debian.org/security/2015/dsa-3276
http://www.securityfocus.com/bid/74928
http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159513.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159603.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159610.html
http://symfony.com/blog/cve-2015-4050-esi-unauthorized-access Vendor Advisory
http://www.debian.org/security/2015/dsa-3276
http://www.securityfocus.com/bid/74928

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2015-4050), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.