CVE-2024-55492Public exploitNetwork attack vector

Browser script execution via crafted f_user parameter

Published Dec 18, 2024 · Updated Dec 18, 2024

Cross-site scripting in Winmail Server 4.4 allows remote attackers to execute script in a user's browser through the f_user query parameter. The root web endpoint incorporates a closing quote and SVG onload handler supplied through f_user without neutralizing the value before browser rendering. Exploitation requires a user to load the crafted request; the resulting script can read or modify data accessible to the affected browser session.

CVSS severity6.1
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Winmail Server 4.4 allows remote attackers to execute script in a user's browser through the f_user query parameter. The root web endpoint incorporates a closing quote and SVG onload handler supplied through f_user without neutralizing the value before browser rendering. Exploitation requires a user to load the crafted request; the resulting script can read or modify data accessible to the affected browser session.

The record

CVE
CVE-2024-55492
Published
Dec 18, 2024
Updated
Dec 18, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 18, 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

6.1CISA-ADPCVSS: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.

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

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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