What’s Vulnerable › Vulnerabilities

CVE-2026-41180: PsiTransfer: Upload PATCH path traversal can create `config.<NODE_ENV>.js` and lead to code execution on restart

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-23 · updated 2026-10-25
• Weakness: CWE-22

Description

PsiTransfer is an open source, self-hosted file sharing solution. Prior to version 2.4.3, the upload PATCH flow under `/files/:uploadId` validates the mounted request path using the still-encoded `req.path`, but the downstream tus handler later writes using the decoded `req.params.uploadId`. In deployments that use a supported custom `PSITRANSFER_UPLOAD_DIR` whose basename prefixes a startup-loaded JavaScript path, such as `conf`, an unauthenticated attacker can create `config.<NODE_ENV>.js` in the application root. The attacker-controlled file is then executed on the next process restart. Version 2.4.3 contains a patch.

Affected products

• psi-4ward psitransfer: before 2.4.3

References

• https://github.com/psi-4ward/psitransfer/commit/8b547bf3e09757122efa00aab90281e3915aa0c6
• https://github.com/psi-4ward/psitransfer/releases/tag/v2.4.3
• https://github.com/psi-4ward/psitransfer/security/advisories/GHSA-533q-w4g6-5586
• https://github.com/psi-4ward/psitransfer/security/advisories/GHSA-533q-w4g6-5586

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