CVE-2023-41471Public exploit

Stored script execution via unsafe Markdown rendering

Published Aug 29, 2025 · Updated Nov 3, 2025

Stored XSS in copyparty before 1.9.2 allows local users with server write access to execute JavaScript through crafted Markdown. The WEEKEND-PLANS Markdown editor and full-page viewer render attacker-supplied markup without reliably suppressing embedded script content. Exploitation requires existing write access and a victim to open the crafted file; the upstream project disputes the security boundary because such users can upload HTML containing JavaScript.

CVSS severity7.8
High
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 copyparty before 1.9.2 allows local users with server write access to execute JavaScript through crafted Markdown. The WEEKEND-PLANS Markdown editor and full-page viewer render attacker-supplied markup without reliably suppressing embedded script content. Exploitation requires existing write access and a victim to open the crafted file; the upstream project disputes the security boundary because such users can upload HTML containing JavaScript.

The record

CVE
CVE-2023-41471
Published
Aug 29, 2025
Updated
Nov 3, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 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 vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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