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VulnerabilityPublished

CVE-2026-32109: 9001 copyparty · Cross-site Scripting

Affects 9001 copypartySource CVE Database V5

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Not known to be exploited · CVSS 3.7 Low : upgrade to 1.20.12 when convenient.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
3.7Low
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.20.12
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Mar 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade copyparty and 9001/copyparty to 1.20.12.

Affected software

ProductAffectedFixed in
9001copypartyAffected
  • <1.20.12
Fixed in
  • 1.20.12
GitHub9001/copypartypkg:github/9001/copypartyOther threatsAffected
  • <1.20.12
Fixed in
  • 1.20.12

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

  1. Upgrade copyparty to version 1.20.12 or later, where this vulnerability is fixed.
  2. Restrict write permissions strictly to trusted users to minimize the risk of malicious file uploads.
  3. Implement monitoring and alerting for uploads of files with suspicious names such as .prologue.html or other HTML files that could contain scripts.
  4. Educate users about the risks of clicking unexpected or suspicious links, especially those originating from the copyparty server itself.
  5. Consider additional web server hardening, such as disabling execution of HTML files in upload directories or sanitizing filenames to prevent special file names that trigger script execution.
  6. Review and enforce strict Content Security Policy (CSP) headers to limit the impact of any injected scripts.
  7. Regularly audit user permissions and access controls to ensure least privilege principles are followed.
  8. Use network segmentation to isolate copyparty servers from critical infrastructure to limit lateral movement if compromise occurs.

Description

CVE-2026-32109 is a cross-site scripting (XSS) vulnerability in copyparty versions prior to 1.20.12. It arises when an attacker with both read and write permissions uploads a malicious . prologue.html file and crafts a link that executes arbitrary JavaScript unexpectedly. The vulnerability occurs because the server evaluates the . prologue.html file not only when accessed directly but also when accessed with certain query parameters, leading to unexpected script execution. Exploitation requires the victim to click a crafted link originating from the server itself, which limits the attack scope.

References

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