How severe is CVE-2013-4752?

CVE-2013-4752 has a CVSS score of 6.1/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2013-4752?

CVE-2013-4752 affects the following packages: symfony/symfony (Packagist), symfony/symfony (Packagist), symfony/symfony (Packagist), symfony/symfony (Packagist), symfony/http-foundation (Packagist), symfony/http-foundation (Packagist), symfony/http-foundation (Packagist), symfony/http-foundation (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2013-4752?

Update symfony/symfony to 2.0.24 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2013-4752 is resolved across your whole dependency graph.

How do I detect CVE-2013-4752 in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for symfony/symfony, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2013-4752 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2013-4752 actively exploited in the wild?

No public exploit code has been indexed for CVE-2013-4752 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2013-4752?

CVE-2013-4752 has an EPSS (Exploit Prediction Scoring System) score of 2.3%, placing it in the 83th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2013-4752?

CVE-2013-4752 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2013-4752 published, and has it been updated?

CVE-2013-4752 was published on May 5, 2022 and was last updated on March 16, 2024. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘

🐘 Packagist

Not in CISA KEV

MEDIUM severity

CVE-2013-4752 — symfony

MEDIUM

CVE-2013-4752 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in symfony/symfony. A fix is available for symfony/symfony — see the affected versions and patch details below.

Symfony Host Header Injection vulnerability in the HttpFoundation component

Published

May 5, 2022

Updated

Mar 16, 2024

Affected

8 pkgs

Patched

8 / 8

Exploits

None indexed

Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

2.3%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs83th percentile — riskier than 83% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

8 pkgs affected

🐘symfony/symfony🐘symfony/symfony🐘symfony/symfony🐘symfony/symfony🐘symfony/http-foundation🐘symfony/http-foundation🐘symfony/http-foundation🐘symfony/http-foundation

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Symfony 2.0.X before 2.0.24, 2.1.X before 2.1.12, 2.2.X before 2.2.5, and 2.3.X before 2.3.3 have an issue in the HttpFoundation component. The Host header can be manipulated by an attacker when the framework is generating an absolute URL. A remote attacker could exploit this vulnerability to inject malicious content into the Web application page and conduct various attacks.

Affected Packages

8 total 8 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`symfony/symfony`	≥ 2.0.0&&< 2.0.24	2.0.24`composer require symfony/symfony:^2.0.24`
🐘Packagist	`symfony/symfony`	≥ 2.1.0&&< 2.1.12	2.1.12`composer require symfony/symfony:^2.1.12`
🐘Packagist	`symfony/symfony`	≥ 2.2.0&&< 2.2.5	2.2.5`composer require symfony/symfony:^2.2.5`
🐘Packagist	`symfony/symfony`	≥ 2.3.0&&< 2.3.3	2.3.3`composer require symfony/symfony:^2.3.3`
🐘Packagist	`symfony/http-foundation`	≥ 2.0.0&&< 2.0.24	2.0.24`composer require symfony/http-foundation:^2.0.24`
🐘Packagist	`symfony/http-foundation`	≥ 2.1.0&&< 2.1.12	2.1.12`composer require symfony/http-foundation:^2.1.12`

Affected Products

2 products · 6 configurations

fedorafedoraproject

2 versions

1819

Application

symfonysensiolabs

≥ 2.3.0 && < 2.3.3

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for symfony/symfony, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update symfony/symfony to 2.0.24 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2013-4752 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

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