CVE-2026-30974Network attack vector

Stored XSS via executable SVG responses

Published Mar 10, 2026 · Updated Mar 10, 2026

Stored XSS in 9001 copyparty before 1.20.11 allows remote authenticated users to execute JavaScript through an uploaded SVG. The HTTP file-serving path applied nohtml only when the detected MIME type contained HTML, leaving SVG responses executable in a browser. Exploitation requires write permission, nohtml on the target volume, and another user to open the SVG; the script can move, delete, or upload files as that user.

CVSS severity4.6
Medium
EPSS probability0.32%
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 9001 copyparty before 1.20.11 allows remote authenticated users to execute JavaScript through an uploaded SVG. The HTTP file-serving path applied nohtml only when the detected MIME type contained HTML, leaving SVG responses executable in a browser. Exploitation requires write permission, nohtml on the target volume, and another user to open the SVG; the script can move, delete, or upload files as that user.

The record

CVE
CVE-2026-30974
Published
Mar 10, 2026
Updated
Mar 10, 2026
Vendor
copyparty
Product
copyparty
Classifications
CWE-79, T1204.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.20.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

copyparty · copypartyversion=< 1.20.11

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
4.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.002Malicious File

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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