CVE-2026-86538
High · CVSS 8.7Published 2026-09-07
CVSS
8.7
High
EPSS
—
exploit probability
Active Exploit
No
not yet listed
High — patch soon — High severity. Target patch within 7 days.
What is 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.
CVSS Score Explained
CVSS 8.7 is High severity. Exploitation is likely straightforward and the impact is significant — data loss, privilege escalation, or remote code execution are common outcomes. Patch as soon as possible.
EPSS Exploitation Probability
No EPSS score yet — model needs more data on this CVE.
References & Patches
- ›https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/server/routes/templates.go#L299-L310
- ›https://github.com/knowns-dev/knowns/commit/09c5a96fd5817b941dc86669278c1a17db10ed4e
- PATCHhttps://github.com/knowns-dev/knowns/releases/tag/v0.30.0
- ›https://github.com/knowns-dev/knowns/security/advisories/GHSA-fpxv-c555-rhm3
- ›https://www.vulncheck.com/advisories/knowns-before-0.30.0-path-traversal-via-templatefile-parameter
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