What’s Vulnerable › Vulnerabilities

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

• Severity: low (CVSS 2.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-19 · updated 2026-10-19
• Weakness: CWE-862

Description

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 manage_settings checks. A low-privileged staff account with module-level extension access targets a deactivated non-core module through extension/config_get or extension/config_save. The account can call api/admin/extension/config_get or api/admin/extension/config_save for a deactivated non-core module to read decrypted retained extension secrets and overwrite stored extension configuration. The getConfig function returns the decrypted stored configuration despite the module's inactive state. This residual path remained after the earlier CVE-2026-62962 authorization fix. This issue is fixed in version 0.8.6.

Affected products

• FOSSBilling: from 0.8.4, < 0.8.6

References

• https://github.com/FOSSBilling/FOSSBilling/commit/7a7a30984b58cd1008a573fc70296a7653d8ae04
• https://github.com/FOSSBilling/FOSSBilling/pull/4184
• https://github.com/FOSSBilling/FOSSBilling/releases/tag/0.8.6
• https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-3g7m-ph2r-jhcx

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