CVE-2013-4752Network attack vector

Absolute-URL poisoning via untrusted Host header

Published Jan 2, 2020 · Updated Aug 6, 2024

Symfony HttpFoundation allows remote attackers to inject content into generated absolute URLs by supplying a crafted HTTP Host header. Request::getHost() trusts $_SERVER['HOST'], so downstream URL generation incorporates the request-controlled hostname without validating it against an application allowlist. Exploitation requires a server or reverse-proxy configuration that forwards an attacker-selected Host value and an application flow that emits an absolute URL, such as a password-reset link; the poisoned link can direct a victim to attacker-controlled content.

CVSS severity6.1
Medium
EPSS probability2.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Symfony HttpFoundation allows remote attackers to inject content into generated absolute URLs by supplying a crafted HTTP Host header. Request::getHost() trusts $_SERVER['HOST'], so downstream URL generation incorporates the request-controlled hostname without validating it against an application allowlist. Exploitation requires a server or reverse-proxy configuration that forwards an attacker-selected Host value and an application flow that emits an absolute URL, such as a password-reset link; the poisoned link can direct a victim to attacker-controlled content.

The record

CVE
CVE-2013-4752
Published
Jan 2, 2020
Updated
Aug 6, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 2, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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