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Vulnerability record · CVE-2026-45225 · published 12 May 2026

CVE-2026-45225: Path traversal vulnerability

Heym before 0.0.21 contains a path traversal vulnerability in the file upload endpoint that allows authenticated users to write attacker-controlled files to arbitrary locations by supplying a crafted filename with traversal sequences. Attackers can exploit the unvalidated filename parameter in the upload_file() handler to bypass path restrictions and write, read, or delete files outside the intended storage directory.

7.2 CVSS 4.0 High EPSS 0.50% · top 59.7% CWE-22 · Path traversal Deferred
7.2CVSS 4.0 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
14 Jul 2026Last modified by NVD

Description

Heym before 0.0.21 contains a path traversal vulnerability in the file upload endpoint that allows authenticated users to write attacker-controlled files to arbitrary locations by supplying a crafted filename with traversal sequences. Attackers can exploit the unvalidated filename parameter in the upload_file() handler to bypass path restrictions and write, read, or delete files outside the intended storage directory.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/heymrun/heym/commit/835843e6d2bf7d018cbb8e50f28f0426eaa20c84
https://github.com/heymrun/heym/pull/92
https://github.com/heymrun/heym/releases/tag/v0.0.21
https://www.vulncheck.com/advisories/heym-path-traversal-file-upload-via-upload-file
https://github.com/heymrun/heym/pull/92

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Source: NIST National Vulnerability Database (record CVE-2026-45225), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.