CVE-2026-86538
CVE-2026-86538
knowns versions before 0.30.0 contain a path traversal vulnerability in the POST /api/templates/preview endpoint that allows unauthenticated attackers to read arbitrary files. Attackers can supply directory traversal sequences in the templateFile parameter to bypass path restrictions and read sensitive files like credentials and configuration through the JSON response.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.010 (62.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 62nd percentile — 62.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.010 · change: +0.002
Weakness classification (CWE)
References
- Template preview reads filepath.Join(tmpl.Path, templateFile) (v0.29.1) (technical-description)
- knowns fix commit 09c5a96fd581 (patch)
- knowns v0.30.0 Release Notes (release-notes)
- GitHub Security Advisory (GHSA-fpxv-c555-rhm3) (vendor-advisory)
- VulnCheck Advisory: knowns before 0.30.0 Path Traversal via templateFile parameter (third-party-advisory)
Frequently asked questions
- What is CVE-2026-86538?
- CVE-2026-86538 is a high-severity vulnerability, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-09-07.
- How severe is CVE-2026-86538?
- High severity. CVSS v3 base score is 7.5 out of 10.