CVE-2026-97155: Fabasoft Folio Client · Origin Validation Error
Affects Fabasoft Folio ClientSource CVE Database V5
Not known to be exploited · CVSS 6.5 Medium : upgrade to 2026 when convenient.
Data as of 5 Nov 2026, 23:24 UTC
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 1% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 2026
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 24 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.
What to do
Upgrade Fabasoft Folio Client to 2026.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| FabasoftFolio Client | Affected
| Fixed in
|
AI-suggested
Fixed versions of Fabasoft Folio Client are available starting with build 26.0.0.10 in the 2026 release and build 26.4.0.76 in the 2026 April release. Users should upgrade to these or later versions to remediate the vulnerability. Since this is a locally installed client, patching is required on the endpoint. No vendor advisory content was provided to indicate alternative mitigations or temporary fixes.
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.