CVE-2026-84828

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    CVE-2026-84828

    Published: 10 Sept 2026Last Modified: 12 Sept 2026

    Summary: Pcs: pcs: non-root haclient users can read arbitrary files via pcs host auth --token

    Details: A flaw was found in PCS (Pacemaker Configuration System). A local attacker with membership in the 'haclient' group can exploit the 'pcs host auth --token' command to read the contents of arbitrary files on the filesystem, provided the files are shorter than 256 bytes. The file contents are read with root privileges by the pcsd daemon and can be exfiltrated by the attacker through subsequent cluster node communication. This allows disclosure of sensitive data such as API keys, tokens, or configuration secrets that would otherwise be inaccessible to the attacker.

    References: https://access.redhat.com/downloads/content/package-browser/, https://access.redhat.com/security/cve/CVE-2026-84828, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84828.json, https://nvd.nist.gov/vuln/detail/CVE-2026-84828, https://bugzilla.redhat.com/show_bug.cgi?id=2527320, https://github.com/ClusterLabs/pcs/commit/9178b78d11baa70e700a5c0d9fc1c17f27d452fa

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -9178b78d11baa70e700a5c0d9fc1c17f27d452fa

    Affected versions

    v0.10.7

    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-2026-84828 | CVE-DB