Fabasoft Folio Client 2026 Web Messaging access control

Summaryinfo

A vulnerability, which was classified as critical, has been found in Fabasoft Folio Client 2026. Affected by this vulnerability is an unknown functionality of the component Web Messaging. The manipulation leads to access control. This vulnerability is uniquely identified as CVE-2026-97155. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Fabasoft Folio Client 2026. This issue affects an unknown functionality of the component Web Messaging. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Fabasoft Folio Client before 2026, a locally installed component that communicates with the Fabasoft browser extension via web messaging, does not restrict which web origins may invoke its functions by default. The registry value VALIDDOMAINS, which limits permitted origins, was optional and empty by default, resulting in all domains being trusted. As a consequence, any website visited by a user with the Folio Client and browser extension installed could invoke client functions, e.g., related to downloading documents, opening documents, and synchronizing files. The first fixed builds are Fabasoft Folio Client 2026 (Build 26.0.0.10) and Fabasoft Folio Client 2026 April Release (Build 26.4.0.76). This client is, for example, shipped with Fabasoft eGov-Suite.

The advisory is shared at help.supportservices.fabasoft.com. The identification of this vulnerability is CVE-2026-97155 since 09/24/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading to version 26.0.0.10 or 26.4.0.76 eliminates this vulnerability.

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Productinfo

Vendor

• Fabasoft

Name

• Folio Client

Version

• 2026

CPE 2.3info

• 🔒

CPE 2.2info

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