CVE-2026-29100 SuiteCRM has Reflected HTML Injection in Login Page via default_user_name Parameter

High 7.1 Published 19 Mar 2026 Updated 21 Mar 2026

Attackers can inject HTML into the login page to facilitate phishing and defacement, requiring users to upgrade to the patched version.

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-2026-29100?

CVE-2026-29100 is a high-severity cross-site scripting vulnerability in SuiteCRM, published on 19 Mar 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

SuiteCRM is an open-source, enterprise-ready Customer Relationship Management (CRM) software application. SuiteCRM 7.15.0 contains a reflected HTML injection vulnerability in the login page that allows attackers to inject arbitrary HTML content, enabling phishing attacks and page defacement. Version 7.15.1 patches the issue.

Weakness: CWE-79

Which versions are affected by CVE-2026-29100?

It affects 1 product.

Products include Suitecrm Suitecrm.

How do I fix CVE-2026-29100?

No fix has been published for CVE-2026-29100 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-2026-29100 being exploited?

There is no known exploitation of CVE-2026-29100 in the wild and no public exploit code.

Sources

Also known as GHSA-g7hf-3j93-rwm5.