CVE-2023-38501Public exploitNetwork attack vector

File manipulation via cookie header injection

Published Jul 25, 2023 · Updated Feb 13, 2025

Reflected XSS in copyparty before 1.8.7 allows remote attackers to run JavaScript in a user's browser via a crafted link. The HTTP handler accepts control characters in k304 or setck query values, placing them in Set-Cookie headers so newlines terminate the headers and inject response-body markup. A user must open the link; the script runs with that user's session and can upload, move, or delete files permitted by the account.

CVSS severity6.3
Medium
EPSS probability9.25%
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 copyparty before 1.8.7 allows remote attackers to run JavaScript in a user's browser via a crafted link. The HTTP handler accepts control characters in k304 or setck query values, placing them in Set-Cookie headers so newlines terminate the headers and inject response-body markup. A user must open the link; the script runs with that user's session and can upload, move, or delete files permitted by the account.

The record

CVE
CVE-2023-38501
Published
Jul 25, 2023
Updated
Feb 13, 2025
Vendor
copyparty
Product
copyparty
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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 <1.8.7
  2. Affected versionversion=< 1.8.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

copyparty · copypartyversion=0 <1.8.7; version=< 1.8.7

Published CVSS scores

6.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
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 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')
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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