CVE-2026-33534 Details.
EspoCRM <= 9.3.3 - Server-Side Request Forgery
Atlas does not check this one. Needs requests that change data.
To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check.
About CVE-2026-33534. What It Means.
EspoCRM <= 9.3.3 contains an authenticated server-side request forgery caused by improper internal-host validation using alternative IPv4 formats in HostCheck::isNotInternalHost(), letting authenticated users access internal resources via /api/v1/Attachment/fromImageUrl endpoint.
Affected Product. What Is Hit.
- Vendor
- espocrm
- Product
- EspoCRM
References. Where To Read More.
FAQ
Common Questions.
EspoCRM <= 9.3.3 - Server-Side Request Forgery. EspoCRM <= 9.3.3 contains an authenticated server-side request forgery caused by improper internal-host validation using alternative IPv4 formats in HostCheck::isNotInternalHost(), letting authenticated users access internal resources via /api/v1/Attachment/fromImageUrl endpoint.
No. To test for this one, the check would have to send requests that could change data on the site. Atlas only ever reads public pages, so it does not run this check. The facts about CVE-2026-33534 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
CVE-2026-33534 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing.
Update EspoCRM to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-33534. Atlas does not run a check for it, so nothing here says whether a particular site is affected.