CVE-2026-84828
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.
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
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 Medium
CVSS: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 Medium
CVSS: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 Medium
CVSS: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 Medium
CVSS: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 Medium
CVSS: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 Medium
CVSS: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 Medium
CVSS: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
| Package | Affected | Fixed |
|---|---|---|
pcsDebian: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 less0.11.7-20.11.7-30.11.9-10.12.0-10.12.0-20.12.0.2-10.12.1-10.12.1-20.12.2-10.12.2-20.12.3-10.12.3.1-10.12.3.1-2 |
None known |
pcsDebian: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 |
pcsDebian: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 |
pcsUbuntu: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 |
pcsUbuntu:24.04:LTS |
All versions, plus listed versions 0.11.6-1ubuntu10.11.7-1ubuntu10.11.7-1ubuntu1.1 |
None known |
pcsUbuntu:26.10 |
All versions, plus listed versions 0.12.1-2ubuntu30.12.2-2ubuntu1 |
None known |
pcsUbuntu:26.04:LTS |
All versions, plus listed versions 0.12.1-2ubuntu10.12.1-2ubuntu3 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | NVD, OSV | |
| products | CVE List | |
| facts | EUVD | |
| first indexed | CVE 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.