CVE-2023-5523 — Execution of downloaded content flaw in M-Files Web Companion before release ver

Execution of downloaded content flaw in M-Files Web Companion before release version 23.10 and LTS Service Release Versions before 23.8 LTS SR1 allows

01What is this vulnerability?

Execution of downloaded content flaw in M-Files Web Companion before release version 23.10 and LTS Service Release Versions before 23.8 LTS SR1 allows

02Affected products

Vendor	Product	Versions
M-Files	Web Companion	23.3, 23.8 LTS SR1

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-10-20T06:40:29.555Z
• Last modified: 2026-02-23T08:53:41.857Z

09References

• product.m-files.com — https://product.m-files.com/security-advisories/cve-2023-5523/
• empower.m-files.com — https://empower.m-files.com/security-advisories/CVE-2023-5523