CVE-2026-32109: 9001 copyparty · Cross-site Scripting
Affects 9001 copypartySource CVE Database V5
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
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 11 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| 9001copyparty | Affected
| Fixed in
|
GitHub9001/copypartypkg:github/9001/copypartyOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
- Upgrade copyparty to version 1.20.12 or later, where this vulnerability is fixed.
- Restrict write permissions strictly to trusted users to minimize the risk of malicious file uploads.
- Implement monitoring and alerting for uploads of files with suspicious names such as .prologue.html or other HTML files that could contain scripts.
- Educate users about the risks of clicking unexpected or suspicious links, especially those originating from the copyparty server itself.
- 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.
- Review and enforce strict Content Security Policy (CSP) headers to limit the impact of any injected scripts.
- Regularly audit user permissions and access controls to ensure least privilege principles are followed.
- 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.