CVE-2026-86538: knowns before 0.30.0 Path Traversal via templateFile parameter

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of 29 Oct 2026.

VulnCheck KEV lists it since 17 Sep 2026. It cites 1 public report, the first from 17 Sep 2026.

• previdian.com

How likely is exploitation in the next 30 days?

1%

EPSS score, percentile 62.3 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?

8.7 High

CVSS v4.0 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (3)

Which versions are affected?

Affected

• before 0.30.0

Unaffected 0.30.0

Versions by product

Source: CISA KEV 2026.10.29, as of 29 Oct 2026; VulnCheck KEV, as of 30 Oct 2026; FIRST EPSS, as of 29 Oct 2026; CVE List, as of 30 Oct 2026. About the data.

Description

knowns before 0.30.0 Path Traversal via templateFile parameter

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.

Source: CVE List, as of 30 Oct 2026. About the data.

What to do

Advisories and patches

• knowns fix commit 09c5a96fd581 (Patch)
• GitHub Security Advisory (GHSA-fpxv-c555-rhm3) (Vendor advisory)
• knowns v0.30.0 Release Notes (Release notes)

This summary is based on the CVE record as of 30 Oct 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Source: CVE List, as of 30 Oct 2026. About the data.

Timeline