CVE-2026-86538CWE-22path-traversal

CVE-2026-86538

High · published September 8, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
62.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS
0.00984 · 62.0th percentile
Weakness
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Published
2026-09-08T03:16Z
References (5)
https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/server/routes/templates.go#L299-L310 · [email protected]https://github.com/knowns-dev/knowns/commit/09c5a96fd5817b941dc86669278c1a17db10ed4e · [email protected]https://github.com/knowns-dev/knowns/releases/tag/v0.30.0 · [email protected]https://github.com/knowns-dev/knowns/security/advisories/GHSA-fpxv-c555-rhm3 · [email protected]https://www.vulncheck.com/advisories/knowns-before-0.30.0-path-traversal-via-templatefile-parameter · [email protected]
EPSS history
Timeline
  • 09 SEP 03:20Z
    EPSS moved — → 1%
    epss
  • 07 SEP 23:03Z
    knowns before 0.30.0 Path Traversal via templateFile parameter
    cvelistv5