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Fencer Vulns
medium 4.3

CVE-2018-1086 json

pcs before versions 0.9.164 and 0.10 is vulnerable to a debug parameter removal bypass.

published 2018-04-12 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-11736

cvss
4.3
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

pcs before versions 0.9.164 and 0.10 is vulnerable to a debug parameter removal bypass. REST interface of the pcsd service did not properly remove the pcs debug argument from the /run_pcs query, possibly disclosing sensitive information. A remote attacker with a valid token could use this flaw to elevate their privilege.

Patch / fix

  • pcs Debian 14, Debian 13, Debian 12 0.9.164-1

debian advisories DEBIAN-CVE-2018-1086

  • pcs Ubuntu Pro 16.04 LTS 0.9.149-1ubuntu1.1+esm1

ubuntu advisories UBUNTU-CVE-2018-1086

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • pcs RHEL 7 0.9.162-5.el7_5.1
  • pcs-snmp RHEL 7 0.9.162-5.el7_5.1
  • pcs RHEL 6 0.9.155-3.el6

red hat advisories RHSA-2018:1060RHSA-2018:1927

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-1086 updated cvss 4.3

pcs: Debug parameter removal bypass, allowing information disclosure

  • Red Hat Enterprise Linux High Availability (v. 6) pcs 0.9.155-3.el6 Red Hat Enterprise Linux Resilient Storage (v. 6) pcs 0.9.155-3.el6
    fixed: vendor fix RHSA-2018:1927
  • Red Hat Enterprise Linux Server High Availability (v. 7) pcs 0.9.162-5.el7_5.1, pcs-snmp 0.9.162-5.el7_5.1 Red Hat Enterprise Linux Server Resilient Storage (v. 7) pcs 0.9.162-5.el7_5.1, pcs-snmp 0.9.162-5.el7_5.1
    fixed: vendor fix RHSA-2018:1060
  • Red Hat Enterprise Linux 8 pcs, pcs-snmp Red Hat Storage 3 pcs
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.92% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 4.3 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • redhat pcs

Classification

Weakness
  • CWE-20 Improper Input Validation
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.