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No exploitation reportedFix availableAwaiting NVD analysis

CVE-2026-84828

Pcs: pcs: non-root haclient users can read arbitrary files via pcs host auth --token

No exploitation reported by the sources we read.

  • Published2026-09-10
  • WeaknessCWE-732

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-09-1011:20CVE publishedCNA

Versions per branch

Products declared by the CNA7 products

As redhat, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

1 more product in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-06

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • pcsUbuntu:Pro:22.04:LTSall versions · no fixed version listed
  • pcsUbuntu:26.10all versions · no fixed version listed
  • pcsUbuntu:26.04:LTSall versions · no fixed version listed
  • pcsUbuntu:24.04:LTSall versions · no fixed version listed
  • pcsDebian:14all versions · fixed in 0.12.3.1-1
  • pcsDebian:13all versions · no fixed version listed
  • pcsDebian:12all versions · no fixed version listed

Vendor advisories

  • CVE-2026-84828 Red Hat Product Security13 known affected

    pcs: pcs: non-root haclient users can read arbitrary files via pcs host auth --token

    cockpit-ha-cluster as a component of Red Hat Enterprise Linux 10 · pcs as a component of Red Hat Enterprise Linux 10 · pcs-snmp as a component of Red Hat Enterprise Linux 10 · +10 more

Full record on NVD

Fix

  1. Workaround from the vendor Red Hat Product Security CVE-2026-84828 · 13 productsRestrict membership in the 'haclient' group to only trusted users who require cluster management access. Audit current 'haclient' group membership and remove any unnecessary accounts. This reduces exposure but does not fully eliminate the risk for legitimate haclient members.
  2. No fix available, says the vendor Red Hat Product Security CVE-2026-84828 · 13 productsFix deferred

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Published
2026-09-10
Last Modified
2026-11-06
NVD status
Awaiting Analysis
GitHub Advisory
GHSA-5g5g-4cqv-r2jw

Frequently asked questions

What is CVE-2026-84828?

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.

Is CVE-2026-84828 actively exploited?

Active exploitation of CVE-2026-84828 has not been confirmed. Its EPSS score was 0.1% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-84828?

CVE-2026-84828 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

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