Vulnerability record · CVE-2026-86538 · published 7 September 2026

CVE-2026-86538: Path traversal vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.98% · top 39.2% CWE-22 · Path traversal Deferred

8.7CVSS 4.0 base score

0.98%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

5References

14 Sep 2026Last modified by NVD

Description

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

Link	Tags
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
https://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

Track CVE-2026-86538 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-93616Checkpoint multi-domain security management path traversal vulnerabilityA directory traversal and file upload vulnerability allows an unauthenticated attacker to upload and execute arbitrary scripts on Check Point Managem…KEVEPSS 20%22 Sep 2026 10.0CVE-2026-85706GitLab CE/EE repository commits API path traversal allows unauthenticated file readGitLab CE/EE contains improper path confinement and missing authentication enforcement in the repository commits API, allowing an unauthenticated use…KEVEPSS 91%analysed12 Sep 2026 5.3CVE-2026-66384JFrog Artifactory path traversal in Docker cache pathAn authenticated user can write data outside the intended Docker cache path under specific remote-repository conditions in JFrog Artifactory. The fla…KEVEPSS 0.66%analysed12 Aug 2026 9.8CVE-2026-59310VMware vCenter Syslog server path traversal leads to RCEVMware vCenter's Syslog server is affected by a directory traversal flaw (CWE-22) that allows a remote, unauthenticated attacker to execute arbitrary…KEVEPSS 2.6%analysed30 Jul 2026 10.0CVE-2026-48282Adobe ColdFusion path traversal leads to remote code executionColdFusion versions 2025.9, 2023.20 and earlier contain a path traversal flaw (CWE-22) that allows an unauthenticated remote attacker to reach files …KEVEPSS 42%analysed30 Jun 2026 10.0CVE-2026-34909UniFi OS path traversal allows unauthenticated file accessUniFi OS devices contain a path traversal flaw (CWE-22) that lets a network-reachable attacker read files on the underlying system. Because the expos…KEVEPSS 1.8%analysed22 May 2026 6.5CVE-2026-20262Cisco Catalyst SD-WAN Manager path traversal in file uploadCisco Catalyst SD-WAN Manager (formerly vManage) fails to properly validate user-supplied input during a file upload process, allowing path traversal…KEVEPSS 28%analysed15 Jun 2026 8.4CVE-2024-1708ConnectWise ScreenConnect path traversal enabling remote code executionConnectWise ScreenConnect 23.9.7 and earlier contain a path-traversal flaw (CWE-22) that can let an attacker execute remote code or reach confidentia…KEVEPSS 95%analysed21 Feb 2024

Source: NIST National Vulnerability Database (record CVE-2026-86538), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.