What is CVE-2026-91197?

CVE-2026-91197 is a medium-severity vulnerability in Flowable Flowable-Engine, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 6.5/10. Published 2026-09-14.

How severe is CVE-2026-91197?

Medium severity. CVSS v3 base score is 6.5 out of 10.

XXE in Flowable Flowable-Engine

CVE-2026-91197

Flowable flowable-engine through 8.0.0 contains an XML external entity injection vulnerability in ProcessDiagramLayoutFactory.parseXml() that fails to disable external entity resolution when parsing deployed BPMN resources. Attackers with process deployment privileges can embed DOCTYPE declarations with external entities in BPMN files to read arbitrary local files or trigger requests to internal network endpoints when diagram layout is computed.

Vulnerability class: XXE (XML External Entity)

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Flowable Flowable-engine

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (technical-description)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-91197?: CVE-2026-91197 is a medium-severity vulnerability in Flowable Flowable-Engine, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 6.5/10. Published 2026-09-14.
How severe is CVE-2026-91197?: Medium severity. CVSS v3 base score is 6.5 out of 10.