CVE-2026-91197

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-15. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
45(Track)
EG Risk 45/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 16, 2026

Advisory Details (5)

Auto-updated Sep 14, 2026
No patch confirmed yet.
generic

Flowable flowable-engine through 8.0.0 XXE via ProcessDiagramLayoutFactory | Advisories | VulnCheck

https://www.vulncheck.com/advisories/flowable-flowable-engine-through-8.0.0-xxe-via-processdiagramlayoutfactory
generic

flowable-engine/modules/flowable5-engine/src/main/java/org/activiti/engine/impl/bpmn/diagram/ProcessDiagramLayoutFactory.java at 0779d68e5a3385b74d8acb8bc37901ff54513249 · flowable/flowable-engine · GitHub

https://github.com/flowable/flowable-engine/blob/0779d68e5a3385b74d8acb8bc37901ff54513249/modules/flowable5-engine/src/main/java/org/activiti/engine/impl/bpmn/diagram/ProcessDiagramLayoutFactory.java#L97-L114
generic

flowable-engine/modules/flowable-engine/src/main/java/org/flowable/engine/impl/bpmn/diagram/ProcessDiagramLayoutFactory.java at 0779d68e5a3385b74d8acb8bc37901ff54513249 · flowable/flowable-engine · GitHub

https://github.com/flowable/flowable-engine/blob/0779d68e5a3385b74d8acb8bc37901ff54513249/modules/flowable-engine/src/main/java/org/flowable/engine/impl/bpmn/diagram/ProcessDiagramLayoutFactory.java#L101-L118
generic

GitHub - flowable/flowable-engine: A compact and highly efficient workflow and Business Process Management (BPM) platform for developers, system admins and business users. · GitHub

https://github.com/flowable/flowable-engine
generic

XML External Entity (XXE) injection in ProcessDiagramLayoutFactory · Issue #4216 · flowable/flowable-engine · GitHub

https://github.com/flowable/flowable-engine/issues/4216

Vendor Advisories for CVE-2026-91197(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 21× in last 7d / 21× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-20 23:15 UTCEG score recompute
  2. 2026-09-20 23:15 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-19 21:59 UTCEG score recompute
  5. 2026-09-19 21:59 UTCGHSA enrichment
  6. 2026-09-18 20:41 UTCEG score recompute
  7. 2026-09-18 20:41 UTCGHSA enrichment
  8. 2026-09-18 19:28 UTCEPSS rescore
  9. 2026-09-17 19:32 UTCEPSS rescore
  10. 2026-09-17 19:23 UTCGHSA enrichment
  11. 2026-09-16 17:51 UTCEG score recompute
  12. 2026-09-16 17:50 UTCGHSA enrichment
  13. 2026-09-16 16:55 UTCEG score recompute
  14. 2026-09-16 16:55 UTCGHSA enrichment
  15. 2026-09-16 14:09 UTCEPSS rescore
  16. 2026-09-16 05:15 UTCEPSS rescore
  17. 2026-09-16 00:40 UTCEG score recompute
  18. 2026-09-16 00:40 UTCGHSA enrichment
  19. 2026-09-14 23:22 UTCEG score recompute
  20. 2026-09-14 22:24 UTCEG score recompute
  21. 2026-09-14 22:24 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-91197?
CVE-2026-91197 is a medium vulnerability published on September 14, 2026. 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…
When was CVE-2026-91197 disclosed?
CVE-2026-91197 was first published in the National Vulnerability Database on September 14, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91197 actively exploited?
CVE-2026-91197 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 80.9% of all scored CVEs.
What is the CVSS score of CVE-2026-91197?
CVE-2026-91197 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-91197?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-91197, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-91197

Explore →

Is Your Infrastructure Affected by CVE-2026-91197?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs