CVE-2018-25269 ICEWARP 11.0.0.0 Cross-Site Scripting via Email HTML Injection

Medium 5.1 Published 22 Apr 2026 Updated 25 May 2026

Attackers can inject malicious HTML into emails to execute scripts in clients, stealing sessions and sensitive data.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2018-25269?

CVE-2018-25269 is a medium-severity cross-site scripting vulnerability in ICEWARP Client, published on 22 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

ICEWARP 10.3.4 and 11.0.0.0 contains a cross-site scripting vulnerability that allows attackers to inject malicious HTML elements into emails by embedding base64-encoded payloads in object and embed tags. Attackers can craft emails containing data URIs with embedded scripts that execute in the client when the email is viewed, compromising user sessions and stealing sensitive information.

Weakness: CWE-79

Which versions are affected by CVE-2018-25269?

It affects 1 product.

Products include Icewarp Icewarp.

How do I fix CVE-2018-25269?

No fix has been published for CVE-2018-25269 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-2018-25269 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-25269 exists.

Sources

Also known as GHSA-xx24-qg5f-3r29.