CVE-2025-44593Network attack vector

Stored XSS via bypassed upload validation

Published Sep 9, 2025 · Updated Sep 10, 2025

Stored XSS in Halo before 2.20.13 allows remote attackers to upload HTML files that execute script when another user opens them. The upload file-type validation can be bypassed, so the attachment pipeline accepts executable and HTML content that its file restrictions are intended to reject. Exploitation requires another user to open the uploaded HTML; the documented impact is script execution in that user's web context, not server-side code execution.

CVSS severity6.1
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Halo before 2.20.13 allows remote attackers to upload HTML files that execute script when another user opens them. The upload file-type validation can be bypassed, so the attachment pipeline accepts executable and HTML content that its file restrictions are intended to reject. Exploitation requires another user to open the uploaded HTML; the documented impact is script execution in that user's web context, not server-side code execution.

The record

CVE
CVE-2025-44593
Published
Sep 9, 2025
Updated
Sep 10, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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?

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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