CVE-2026-86538

    Dashboard / Vulnerabilities / CVE-2026-86538

    CVE-2026-86538

    Published: 7 Sept 2026Last Modified: 12 Sept 2026

    Summary: knowns before 0.30.0 Path Traversal via templateFile parameter

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86538.json, https://github.com/knowns-dev/knowns/releases/tag/v0.30.0, https://github.com/knowns-dev/knowns/security/advisories/GHSA-fpxv-c555-rhm3, https://nvd.nist.gov/vuln/detail/CVE-2026-86538, https://www.vulncheck.com/advisories/knowns-before-0.30.0-path-traversal-via-templatefile-parameter, https://github.com/knowns-dev/knowns/commit/09c5a96fd5817b941dc86669278c1a17db10ed4e, https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/server/routes/templates.go#L299-L310

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -cead30b2c3a34f66c0c40cb692ed51e588e63bd7

    Affected versions

    v0.29.1
    v0.29.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-86538 | CVE-DB