What is CVE-2026-18099?

CVE-2026-18099 is a high-severity vulnerability in Ibm I, classified under Cross-site Scripting. CVSS score: 8.9/10. Published 2026-08-12.

How severe is CVE-2026-18099?

High severity. CVSS v3 base score is 8.9 out of 10.

XSS in Ibm I

CVE-2026-18099

IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote authenticated attacker to execute arbitrary script code due to improper neutralization of user-controlled input.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 8.9 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L.

Affected products

Ibm I — versions 7.6, 7.5, 7.4

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

psirt@us.ibm.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-18099?: CVE-2026-18099 is a high-severity vulnerability in Ibm I, classified under Cross-site Scripting. CVSS score: 8.9/10. Published 2026-08-12.
How severe is CVE-2026-18099?: High severity. CVSS v3 base score is 8.9 out of 10.