CVE-2023-27164Public exploitNetwork attack vector

Stored script execution via unrestricted Markdown upload

Published Mar 10, 2023 · Updated Jul 9, 2026

Cross-site scripting in Halo 1.6.1 and earlier allows remote authenticated users to execute attacker-controlled JavaScript by uploading a crafted Markdown file. The /api/admin/backups/markdown/import endpoint accepts a malicious .md upload without preventing script content, and the stored content executes when an article is viewed. Administrative upload access and viewer interaction are required; the demonstrated consequence is script execution and information disclosure in the viewing context.

CVSS severity4.8
Medium
EPSS probability0.69%
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 Halo 1.6.1 and earlier allows remote authenticated users to execute attacker-controlled JavaScript by uploading a crafted Markdown file. The /api/admin/backups/markdown/import endpoint accepts a malicious .md upload without preventing script content, and the stored content executes when an article is viewed. Administrative upload access and viewer interaction are required; the demonstrated consequence is script execution and information disclosure in the viewing context.

The record

CVE
CVE-2023-27164
Published
Mar 10, 2023
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.8[email protected]CVSS:3.1/AV:N/AC:L/PR:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
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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