CVE-2025-54597Public exploitNetwork attack vector

Reflected XSS via unescaped search query

Published Jul 27, 2025 · Updated Jul 28, 2025

Reflected XSS in LinuxServer.io Heimdall before 2.7.3 allows remote attackers to execute scripts via a crafted q parameter. The Search::form method inserts q into an HTML input value without escaping, so a quote terminates the attribute and injects markup. A victim must load the crafted search URL in a browser, allowing the injected script to read or modify data available to that Heimdall origin.

CVSS severity6.1
Medium
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in LinuxServer.io Heimdall before 2.7.3 allows remote attackers to execute scripts via a crafted q parameter. The Search::form method inserts q into an HTML input value without escaping, so a quote terminates the attribute and injects markup. A victim must load the crafted search URL in a browser, allowing the injected script to read or modify data available to that Heimdall origin.

The record

CVE
CVE-2025-54597
Published
Jul 27, 2025
Updated
Jul 28, 2025
Vendor
LinuxServer.io
Product
Heimdall
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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=0 <2.7.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LinuxServer.io · Heimdallversion=0 <2.7.3

Published CVSS scores

7.2MITRECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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