{"id":80958,"date":"2026-06-23T17:50:50","date_gmt":"2026-06-23T14:20:50","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/cve-2026-28496-fossbilling-server-side-template-injection-in-twig-template-rendering-enables-information-disclosure-and-rce\/"},"modified":"2026-06-23T17:50:50","modified_gmt":"2026-06-23T14:20:50","slug":"cve-2026-28496-fossbilling-server-side-template-injection-in-twig-template-rendering-enables-information-disclosure-and-rce","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/cve-2026-28496-fossbilling-server-side-template-injection-in-twig-template-rendering-enables-information-disclosure-and-rce\/","title":{"rendered":"CVE-2026-28496 &#8211; FOSSBilling: Server-side template injection in Twig template rendering enables information disclosure and RCE"},"content":{"rendered":"<p>CVE ID :CVE-2026-28496<\/p>\n<p>  Published : June 23, 2026, 2:20 p.m. | 1\u00a0hour, 23\u00a0minutes ago<\/p>\n<p>  Description :FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 have a Server-Side Template Injection (SSTI) vulnerability in the 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 Twig environment, API context, and the application&#8217;s dependency injection container. Version 0.8.0 patches the issue. Some workarounds are available. Audit existing email templates for suspicious Twig expressions, rotate all admin and client API tokens, and\/or block external access to \/api\/system\/* at reverse proxy\/WAF to mitigate chaining with GHSA-78&#215;5-c8gw-8279.<\/p>\n<p>  Severity: 0.0 | NA<\/p>\n<p>  Visit the link for more details, such as CVSS details, affected products, timeline, and more&#8230;\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CVE ID :CVE-2026-28496 Published : June 23, 2026, 2:20 p.m. | 1\u00a0hour, 23\u00a0minutes ago Description :FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 have a Server-Side Template Injection (SSTI) vulnerability in the template rendering system. Administrators with access to features that render Twig templates (email templates, mass mail campaigns, &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-80958","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/80958","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=80958"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/80958\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=80958"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=80958"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=80958"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}