CVE-2026-53575 EspoCRM: Persistent XSS via CSP nonce injection in applicationName setting by admin user
An authenticated administrator can inject persistent JavaScript via the applicationName setting, allowing session hijacking and data leakage for other users.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-53575?
CVE-2026-53575 is a low-severity cross-site scripting vulnerability in espocrm, published on 15 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
EspoCRM is an open source customer relationship management application. Prior to 9.3.9, an authenticated administrator can place crafted content in the applicationName setting through CSP nonce injection. The persistent injection is inserted into the main application page without escaping, allowing attacker-controlled JavaScript to run in users' sessions and leak page data, including unsaved user input. This issue is fixed in version 9.3.9.
Weakness: CWE-79
Which versions are affected by CVE-2026-53575?
How do I fix CVE-2026-53575?
No fix has been published for CVE-2026-53575 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-2026-53575 being exploited?
There is no known exploitation of CVE-2026-53575 in the wild and no public exploit code.
Sources
Also known as GHSA-f34h-xxmv-j9xp.