What is CVE-2018-1851?

CVE-2018-1851 is a high-severity vulnerability in IBM Websphere Application Server, classified under Deserialization of Untrusted Data. CVSS score: 7.3/10. Published 2018-10-31.

How severe is CVE-2018-1851?

High severity. CVSS v3 base score is 7.3 out of 10.

Deserialization in IBM Websphere Application Server

CVE-2018-1851

IBM WebSphere Application Server Liberty OpenID Connect could allow a remote attacker to execute arbitrary code on the system, caused by improper deserialization. By sending a specially-crafted request to the RP service, an attacker could exploit this vulnerability to execute arbitrary code. IBM X-Force ID: 150999.

Vulnerability class: Insecure Deserialization

Published 2018-10-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.039 (89.9th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 89.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.039 · newest: 0.039 · change: 0.000

Affected products

IBM Websphere Application Server — versions Liberty
IBM Websphere Application Server

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

exchange.xforce.ibmcloud.com/vulnerabilities/150999 (VDB Entry, vdb-entry, Vendor Advisory)
www.ibm.com/support/docview.wss (Patch, Vendor Advisory)
www.securityfocus.com/bid/105839 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-1851?: CVE-2018-1851 is a high-severity vulnerability in IBM Websphere Application Server, classified under Deserialization of Untrusted Data. CVSS score: 7.3/10. Published 2018-10-31.
How severe is CVE-2018-1851?: High severity. CVSS v3 base score is 7.3 out of 10.