CVE-2026-28496 Details.
FOSSBilling - Server-Side Template Injection
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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-2026-28496. What It Means.
A Server-Side Template Injection (SSTI) vulnerability exists in FOSSBilling's template rendering system. Administrators with access to features that render Twig templates (email templates, mass mail campaigns, custom payment adapters, and the string_render API endpoint) can inject arbitrary Twig expressions, leading to information disclosure and remote code execution.
The vulnerability exists because Twig templates are rendered without a sandbox, allowing access to the full…
Affected Product. What Is Hit.
The record for CVE-2026-28496 does not name a vendor or product yet.
References. Where To Read More.
FAQ
Common Questions.
FOSSBilling - Server-Side Template Injection. A Server-Side Template Injection (SSTI) vulnerability exists in FOSSBilling's template rendering system. Administrators with access to features that render Twig templates (email templates, mass mail campaigns, custom payment adapters, and the string_render API endpoint) can inject arbitrary Twig expressions, leading to information disclosure and remote code execution. The vulnerability exists because Twig templates are rendered without a sandbox, allowing access to the full…
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-2026-28496 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
CVE-2026-28496 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing.
Update the affected software 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-2026-28496. Atlas does not run a check for it, so nothing here says whether a particular site is affected.