EUVD-2026-75396
GHSA-5g5g-4cqv-r2jw
Severity by source
AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Local attacker needs haclient group membership (PR:L); pcsd daemon crosses to root context reading arbitrary files (S:C); no integrity or availability impact.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Pacemaker Configuration System (PCS) on Red Hat Enterprise Linux 8, 9, and 10 exposes an arbitrary file-read primitive to local members of the 'haclient' group via the pcs host auth --token command. The pcsd daemon reads the attacker-specified file path with root privileges, base64-encodes up to 256 bytes of content, and transmits it through cluster node communication channels the attacker controls - enabling exfiltration of short sensitive files such as API tokens, symmetric keys, or credential snippets that are otherwise inaccessible to the attacker. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) an existing local shell account on a cluster node where pcsd is running; (2) membership in the 'haclient' group - this is not a default user privilege and must be explicitly granted, typically to cluster administrators or HA management tooling; (3) the target file must be 256 bytes or fewer in size, as enforced by `pcsd_token_max_bytes = 256` in pcs/settings_default.py - files exceeding this limit cause the command to abort before exfiltration; (4) the pcsd daemon must be active. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N, score 6.5) accurately characterizes this vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No specific patched PCS version has been confirmed from the provided references. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
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