Vulnerability · Published Sep 7, 2026 · Assigned by VulnCheck
CVE-2026-86538knowns before 0.30.0 Path Traversal via templateFile parameter
High 7.5
In plain English
A high-severity path traversal in knowns from knowns-dev. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 62% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)1.0%top 37.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| knowns-dev | knowns | 0 – before 0.30.0 |
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- GitHub Security Advisory (GHSA-fpxv-c555-rhm3) vendor-advisory
- 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
- VulnCheck Advisory: knowns before 0.30.0 Path Traversal via templateFile parameter third-party-advisory