CVE-2025-13803Public exploitNetwork attack vector

URL-generation manipulation via unvalidated Host header

Published Dec 1, 2025 · Updated Dec 1, 2025

Host header injection in MediaCrush 1.0.0 and 1.0.1 allows remote attackers to alter generated media URLs through crafted requests. The cdn_url function in mediacrush/paths.py strips but does not validate Host before comparing it with incoming_domain to choose relative or absolute URLs. Unauthenticated network access is sufficient; the direct effect is limited to switching URL form, while cache or generated-link abuse depends on deployment behavior.

CVSS severity6.9
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Host header injection in MediaCrush 1.0.0 and 1.0.1 allows remote attackers to alter generated media URLs through crafted requests. The cdn_url function in mediacrush/paths.py strips but does not validate Host before comparing it with incoming_domain to choose relative or absolute URLs. Unauthenticated network access is sufficient; the direct effect is limited to switching URL form, while cache or generated-link abuse depends on deployment behavior.

The record

CVE
CVE-2025-13803
Published
Dec 1, 2025
Updated
Dec 1, 2025
Vendor
MediaCrush
Product
MediaCrush
Classifications
CWE-644, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 1, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0
  2. Affected versionversion=1.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MediaCrush · MediaCrushversion=1.0.0; version=1.0.1

Published CVSS scores

6.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-644Improper Neutralization of HTTP Headers for Scripting Syntax
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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