CVE Catalog

CVE-2026-84828

MediumCVSS 6.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.14%

4th percentile - higher than 4% of all known CVEs

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 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.

Risk Assessment

An attacker with access to the 'haclient' group can read sensitive files, potentially leading to leakage of API keys, tokens, or other secrets. The risk affects confidentiality of root-only accessible data.

Recommendation

Update PCS to a version containing the fix. Restrict 'haclient' group membership to trusted users and monitor for unusual use of the 'pcs host auth --token' command.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS