CVE-2026-18099 IBM i is Affected By Multiple Vulnerabilities in Navigator for i
A remote authenticated attacker can execute arbitrary script code in IBM i Navigator for i due to improper input neutralization.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-18099?
CVE-2026-18099 is a high-severity cross-site scripting vulnerability in Ibm I, published on 12 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-18099?
It affects 1 product.
Products include Ibm I.
How do I fix CVE-2026-18099?
No fix has been published for CVE-2026-18099 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-18099 being exploited?
There is no known exploitation of CVE-2026-18099 in the wild and no public exploit code.
Other vulnerabilities in Ibm I
- CVE-2026-96119 IBM i is Affected By An Improper Control of Code Generation Vulnerability in HTTP Server Administration GUI
- CVE-2026-16860 IBM i is Affected By Remote Code Execution Vulnerability []
- CVE-2026-17083 IBM i is Affected By Multiple Vulnerabilities in the Debug Server
- CVE-2026-17218 IBM i is Affected By Remote Code Execution Vulnerability in Line Printer Daemon []
- CVE-2026-17276 IBM i is Affected By Multiple Vulnerabilities in Navigator for i
Sources
Also known as GHSA-p5j5-ccp3-6c86.