CVE-2026-28496

CVE-2026-27604 + CVE-2026-28496 — FOSSBilling Pre-Auth RCE Chain Executive Summary This repository contains a local Docker lab for reproducing and validating the FOSSBilling Pre-Auth RCE chain, composed of two chained vulnerabilities: CVE| Type| CVSS v4| GHSA| Description ---|---|---|---|---...

CVE-2026-28496-Lab

CVE-2026-28496 - FOSSBilling Server-Side Template Injection in Twig Rendering Executive Summary This repository contains a local Docker lab for reproducing and validating CVE-2026-28496, a Server-Side Template Injection vulnerability affecting FOSSBilling's Twig template rendering behavior...

FOSKiller

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FOSSBilling < 0.5.3 - Cross-Site Scripting

Cross-site Scripting XSS - Reflected in GitHub repository fossbilling/fossbilling prior to 0.5.4. id: CVE-2023-3521 info: name: FOSSBilling &datefrom='" HTTP/1.1 Host: Hostname matchers-condition: and matchers: - type: word part: body words:...

FOSSBilling 0.5.4-0.7.x - Unauthenticated System API Role Authorization Bypass

FOSSBilling versions 0.5.4 through 0.7.x contain an authorization bypass in API role handling. The internal system role is accepted from the URL, resolves to the cron-admin identity, and reaches privileged system API methods without authentication, a session, or a CSRF token. Version 0.8.0 reject...

CVE-2026-111053

FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.7, the unauthenticated api/guest/system/templateexists endpoint permits path traversal because templateExists uses Path::join on the attacker-controlled file parameter without rejecting .. sequences or...

CVE-2026-111046

FOSSBilling is an open source billing and client-management platform. From 0.8.4 until 0.8.6, hasManagePermission fails open for inactive non-core modules because its early return on !isExtensionActive skips the module-access and managesettings checks. A low-privileged staff account with...

CVE-2026-111056

FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.7, the unauthenticated POST /api/guest/client/create endpoint reveals whether a submitted email belongs to a registered client because guest signup returns a distinct unredacted error when the submitted ema...

CVE-2026-111056 FOSSBilling: Unauthenticated client account enumeration via guest signup endpoint

FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.7, the unauthenticated POST /api/guest/client/create endpoint reveals whether a submitted email belongs to a registered client because guest signup returns a distinct unredacted error when the submitted ema...

EUVD-2026-104418

FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.7, the unauthenticated POST /api/guest/client/create endpoint reveals whether a submitted email belongs to a registered client because guest signup returns a distinct unredacted error when the submitted ema...

CVE-2026-111056

The FOSSBilling open-source billing platform is vulnerable to unauthenticated client account enumeration in versions 0.1.0 through 0.8.7 . The issue exists in the POST /api/guest/client/create endpoint, where the Box Mod Client Api Guest::create method returns an unredacted error message when Cli...

CVE-2026-111056 FOSSBilling: Unauthenticated client account enumeration via guest signup endpoint

FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.7, the unauthenticated POST /api/guest/client/create endpoint reveals whether a submitted email belongs to a registered client because guest signup returns a distinct unredacted error when the submitted ema...

CVE-2026-111053 FOSSBilling: Unauthenticated attacker can probe existence of arbitrary files via guest/system/template_exists

FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.7, the unauthenticated api/guest/system/templateexists endpoint permits path traversal because templateExists uses Path::join on the attacker-controlled file parameter without rejecting .. sequences or...

CVE-2026-111053

The open source billing platform FOSSBilling is vulnerable to a path traversal flaw in versions 0.1.0 through 0.8.7. The api/guest/system/template_exists endpoint improperly handles the file parameter by using Path::join without filtering .. sequences or validating the resolved path against the a...

CVE-2026-111053 FOSSBilling: Unauthenticated attacker can probe existence of arbitrary files via guest/system/template_exists

FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.7, the unauthenticated api/guest/system/templateexists endpoint permits path traversal because templateExists uses Path::join on the attacker-controlled file parameter without rejecting .. sequences or...

EUVD-2026-104416

FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.7, the unauthenticated api/guest/system/templateexists endpoint permits path traversal because templateExists uses Path::join on the attacker-controlled file parameter without rejecting .. sequences or...

CVE-2026-111053 FOSSBilling: Unauthenticated attacker can probe existence of arbitrary files via guest/system/template_exists

FOSSBilling is an open source billing and client-management platform. From 0.1.0 until 0.8.7, the unauthenticated api/guest/system/templateexists endpoint permits path traversal because templateExists uses Path::join on the attacker-controlled file parameter without rejecting .. sequences or...

CVE-2026-111046

In FOSSBilling versions 0.8.4 through 0.8.6 , a broken access control vulnerability allows low-privileged staff accounts to interact with deactivated non-core modules . The root cause is that the hasManagePermission function fails open because an early return for inactive modules skips critical m...

CVE-2026-111046 FOSSBilling: Low-privileged staff can read and modify configuration of deactivated extensions

FOSSBilling is an open source billing and client-management platform. From 0.8.4 until 0.8.6, hasManagePermission fails open for inactive non-core modules because its early return on !isExtensionActive skips the module-access and managesettings checks. A low-privileged staff account with...

EUVD-2026-104415

FOSSBilling is an open source billing and client-management platform. From 0.8.4 until 0.8.6, hasManagePermission fails open for inactive non-core modules because its early return on !isExtensionActive skips the module-access and managesettings checks. A low-privileged staff account with...