CVE-2026-97155 Security feature bypass in Folio Client
Any website can invoke Fabasoft Folio Client functions due to missing origin restrictions, allowing unauthorized document access and synchronization.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-97155?
CVE-2026-97155 is a medium-severity vulnerability in Fabasoft Folio Client, published on 24 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-346
Which versions are affected by CVE-2026-97155?
How do I fix CVE-2026-97155?
No fix has been published for CVE-2026-97155 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-97155 being exploited?
There is no known exploitation of CVE-2026-97155 in the wild and no public exploit code.
Sources
Also known as GHSA-9hhv-69vm-5vcw.