CVE-2026-55184 EspoCRM: Stored XSS in wysiwyg template fields if CSP is disabled
An attacker with template edit permissions can inject malicious HTML that executes in other users' browsers if CSP is disabled, leading to session hijacking.
- 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-2026-55184?
CVE-2026-55184 is a low-severity cross-site scripting vulnerability in espocrm, published on 15 Oct 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
EspoCRM is an open source customer relationship management application. Prior to 9.3.9, a user with Email Template or PDF Template edit permission can store crafted HTML that bypasses moderateSanitizeHtml(). When another user opens the template in edit mode and clientCspDisabled is true, the stored payload executes and can hijack the user's session. This issue is fixed in version 9.3.9.
Weakness: CWE-79
Which versions are affected by CVE-2026-55184?
How do I fix CVE-2026-55184?
No fix has been published for CVE-2026-55184 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-2026-55184 being exploited?
There is no known exploitation of CVE-2026-55184 in the wild and no public exploit code.
Sources
Also known as GHSA-x5p5-8mxj-9wv6.