CVE-2026-84828 Pcs: pcs: non-root haclient users can read arbitrary files via pcs host auth --token
Local attackers in the haclient group can read arbitrary short files via the pcs host auth command, exposing sensitive data like API keys.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-84828?
CVE-2026-84828 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, published on 10 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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.
Weakness: CWE-732
Which versions are affected by CVE-2026-84828?
How do I fix CVE-2026-84828?
Apply the vendor's patch.
Is CVE-2026-84828 being exploited?
There is no known exploitation of CVE-2026-84828 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-84828, GHSA-5g5g-4cqv-r2jw, UBUNTU-CVE-2026-84828.