---
id: CVE-2026-84828
title: A flaw was found in PCS (Pacemaker Configuration System)
summary: >-
  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 fi…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N'
cwe:
  - CWE-732
vendor: Red Hat
product: pcs
affected:
  - pcs (all versions)
  - pcs (all versions)
  - pcs (all versions)
  - openshift/ose-rhel-coreos-9 (all versions)
  - rhosp-rhel8/openstack-base (all versions)
  - rhosp-rhel9/openstack-frr (all versions)
published: '2026-09-10'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T17:17:51.940'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84828'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-84828'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2527320'
    label: secalert@redhat.com
  - url: >-
      https://github.com/ClusterLabs/pcs/commit/9178b78d11baa70e700a5c0d9fc1c17f27d452fa
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84828.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-84828'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84828'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T16:36:45.489242Z'
epss: 0.00142
epssPercentile: 0.02938
ingestedAt: '2026-09-10T11:47:38.666Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4, Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4, … · updated 2026-09-10 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84828.json)