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CVE-2026-84828— Pcs: pcs: non-root haclient users can read arbitrary files via pcs host auth --token

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ClusterLabs PCS是ClusterLabs组织开源的一款配置与管理高可用集群资源的命令行工具。 ClusterLabs PCS存在权限许可和访问控制问题漏洞，该漏洞源于PCS (Pacemaker Configuration System)中的'pcs host auth --token'命令允许本地haclient组攻击者通过pcsd守护进程以root权限读取小于256字节的任意文件，并通过后续集群节点通信外泄，可能导致API密钥、令牌或配置机密等敏感数据泄露。

CVSS 6.5 · Medium EPSS 0.14% · P4

Possible ATT&CK Techniques 2 AI

T1005 · Data from Local System T1042

Affected Version Matrix 6

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
Red Hat Red Hat OpenShift Container Platform 4 any affected
Red Hat Red Hat OpenStack Platform 16.2 any affected
Red Hat Red Hat OpenStack Platform 17.1 any affected
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I. Basic Information for CVE-2026-84828

Vulnerability Information
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Vulnerability Title
Pcs: pcs: non-root haclient users can read arbitrary files via pcs host auth --token
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键资源的不正确权限授予
Source: CVE Program / CVE List V5
Vulnerability Title
ClusterLabs PCS 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ClusterLabs PCS是ClusterLabs组织开源的一款配置与管理高可用集群资源的命令行工具。 ClusterLabs PCS存在权限许可和访问控制问题漏洞，该漏洞源于PCS (Pacemaker Configuration System)中的'pcs host auth --token'命令允许本地haclient组攻击者通过pcsd守护进程以root权限读取小于256字节的任意文件，并通过后续集群节点通信外泄，可能导致API密钥、令牌或配置机密等敏感数据泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenStack Platform 16.2 - cpe:/a:redhat:openstack:16.2
Red Hat Red Hat OpenStack Platform 17.1 - cpe:/a:redhat:openstack:17.1

II. Public POCs for CVE-2026-84828

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III. Intelligence Information for CVE-2026-84828

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Vendor Advisories for CVE-2026-84828 (2)

Same Patch Batch · Red Hat · 2026-09-10 · 6 CVEs total

CVE-2026-84042 7.8 HIGH Crun: crun: rootful krun with passt executes container payload as host root
CVE-2026-88770 6.5 MEDIUM Keycloak-services: keycloak-services: device authorization grant issues tokens to brute-fo
CVE-2026-88859 6.3 MEDIUM Evolution: evolution: javascript execution via spoofed vcard control bypasses mail script-
CVE-2026-88763 5.9 MEDIUM Skupper-router: skupper-router: unbounded recursion in amqp field parser leads to denial o
CVE-2026-88265 5.6 MEDIUM Crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-732