Vulnerability · Published Sep 10, 2026 · Assigned by redhat
CVE-2026-84828Pcs: pcs: non-root haclient users can read arbitrary files via pcs host auth --token
Medium 6.5
In plain English
A medium-severity incorrect permission assignment in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | pcs | no fix listed | DEBIAN-CVE-2026-84828 |
| Debian:13 | pcs | no fix listed | DEBIAN-CVE-2026-84828 |
| Debian:14 | pcs | 0.12.3.1-1 | DEBIAN-CVE-2026-84828 |
| Ubuntu:24.04:LTS | pcs | no fix listed | UBUNTU-CVE-2026-84828 |
| Ubuntu:26.04:LTS | pcs | no fix listed | UBUNTU-CVE-2026-84828 |
| Ubuntu:26.10 | pcs | no fix listed | UBUNTU-CVE-2026-84828 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
| Red Hat | Red Hat OpenStack Platform 16.2 | see references |
| Red Hat | Red Hat OpenStack Platform 17.1 | see references |
Weakness: CWE-732 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
References
- https://access.redhat.com/security/cve/CVE-2026-84828 vdb-entry, x_refsource_REDHAT
- RHBZ#2527320 issue-tracking, x_refsource_REDHAT
- https://github.com/ClusterLabs/pcs/commit/9178b78d11baa70e700a5c0d9fc1c17f27d452fa