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CVE-2026-84828

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

6.5 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.14%Unchanged since Sep 11, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.5

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

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.

Record
CVE-2026-84828
CVSS 3.1
6.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Weakness
CWE-732
Updated
2026-11-06
EUVDEUVD-2026-75396 6.5

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.

Record
EUVD-2026-75396
CVSS 3.1
6.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Updated
2026-11-06
GitHub AdvisoriesGHSA-5g5g-4cqv-r2jw 6.5

A flaw was found in PCS (Pacemaker Configuration System). A local attacker with membership in the...

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.

Record
GHSA-5g5g-4cqv-r2jw
CVSS 3.1
6.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Weakness
CWE-732
Updated
2026-11-02
NVD 6.5

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.

Record
CVE-2026-84828
CVSS 3.1
6.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Weakness
CWE-732
Updated
2026-11-06
OSV 6.5

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

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.

Record
CVE-2026-84828
CVSS 3.1
6.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Weakness
CWE-732
Updated
2026-11-07
OSVDEBIAN-CVE-2026-84828 6.5

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.

Record
DEBIAN-CVE-2026-84828
CVSS 3.1
6.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Updated
2026-11-06
OSVUBUNTU-CVE-2026-84828 6.5

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.

Record
UBUNTU-CVE-2026-84828
CVSS 3.1
6.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
pcs
Debian:12
All versions, plus listed versions
0.11.5-10.11.5-1+deb12u10.11.6-10.11.6-20.11.7-1
Show 13 moreShow less
0.11.7-20.11.7-30.11.9-10.12.0-10.12.0-20.12.0.2-10.12.1-10.12.1-20.12.2-10.12.2-20.12.3-10.12.3.1-10.12.3.1-2
None known
pcs
Debian:13
All versions, plus listed versions
0.12.0.2-10.12.1-10.12.1-20.12.2-10.12.2-20.12.3-10.12.3.1-10.12.3.1-2
None known
pcs
Debian:14
before 0.12.3.1-1, plus listed versions
0.12.0.2-10.12.1-10.12.1-20.12.2-10.12.2-20.12.3-1
0.12.3.1-1
pcs
Ubuntu:Pro:22.04:LTS
All versions, plus listed versions
0.10.8-1ubuntu10.10.11-2ubuntu20.10.11-2ubuntu30.10.11-2ubuntu3+esm1
None known
pcs
Ubuntu:24.04:LTS
All versions, plus listed versions
0.11.6-1ubuntu10.11.7-1ubuntu10.11.7-1ubuntu1.1
None known
pcs
Ubuntu:26.10
All versions, plus listed versions
0.12.1-2ubuntu30.12.2-2ubuntu1
None known
pcs
Ubuntu:26.04:LTS
All versions, plus listed versions
0.12.1-2ubuntu10.12.1-2ubuntu3
None known

History

History
RecordedChangedSources
affectedNVD, OSV
productsCVE List
factsEUVD
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-84828 is a medium vulnerability (CVSS 6.5) in Red Hat Enterprise Linux 10, published September 10, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.14%, the 3rd percentile. Fixed in pcs 0.12.3.1-1.

References

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