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VulnerabilityPublished Updated

CVE-2026-97155: Fabasoft Folio Client · Origin Validation Error

Affects Fabasoft Folio ClientSource CVE Database V5

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Not known to be exploited · CVSS 6.5 Medium : upgrade to 2026 when convenient.

Data as of 5 Nov 2026, 23:24 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 24 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
FabasoftFolio ClientAffected
  • <2026
Fixed in
  • 2026

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.

References

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