CVE-2026-91145

HIGHPre-NVD 7.17.1—
EchelonGraph scoreHIGH confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-09-15. a secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: Elevated riskExposed: 0

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

Activiti through 7.1.0.M6 fails to validate hash-brace deferred expressions in process variables, allowing attackers to bypass expression filtering. Attackers can inject expressions beginning with #{ that are stored and later evaluated in the full Spring context when a mail task uses variable-backed body fields, enabling method invocation on application beans.

CVSS v3
7.1
EG Score
7.1(high)
EG Risk
48(Track)
EG Risk 48/100SSVC: 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
Severity71% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 15, 2026

Advisory Details (5)

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

Activiti through 7.1.0.M6 Expression Injection via Mail Task | Advisories | VulnCheck

https://www.vulncheck.com/advisories/activiti-through-7.1.0-m6-expression-injection-via-mail-task
generic

Activiti/activiti-core/activiti-engine/src/main/java/org/activiti/engine/impl/bpmn/behavior/MailActivityBehavior.java at 7.1.0.M6 · Activiti/Activiti · GitHub

https://github.com/Activiti/Activiti/blob/7.1.0.M6/activiti-core/activiti-engine/src/main/java/org/activiti/engine/impl/bpmn/behavior/MailActivityBehavior.java
generic

Activiti/activiti-core/activiti-api-impl/activiti-api-process-runtime-impl/src/main/java/org/activiti/runtime/api/impl/ExpressionResolver.java at 7.1.0.M6 · Activiti/Activiti · GitHub

https://github.com/Activiti/Activiti/blob/7.1.0.M6/activiti-core/activiti-api-impl/activiti-api-process-runtime-impl/src/main/java/org/activiti/runtime/api/impl/ExpressionResolver.java
generic

GitHub - Activiti/Activiti: Activiti is a light-weight workflow and Business Process Management (BPM) Platform targeted at business people, developers and system admins. Its core is a super-fast and rock-solid BPMN 2 process engine for Java. It's open-source and distributed under the Apache license. Activiti runs in any Java application, on a server, on a cluster or in the cloud. It integrates perfectly with Spring, it is extremely lightweight and based on simple concepts. · GitHub

https://github.com/Activiti/Activiti
generic

EL Injection Guard Bypass via Deferred Expression Syntax (`#{}`) in MailActivityBehavior · Issue #5438 · Activiti/Activiti · GitHub

https://github.com/Activiti/Activiti/issues/5438

Vendor Advisories for CVE-2026-91145(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 25× in last 7d / 25× 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. 2026-09-19 11:09 UTCGHSA enrichment
  2. 2026-09-18 23:36 UTCEG score recompute
  3. 2026-09-18 23:36 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 12:03 UTCGHSA enrichment
  6. 2026-09-18 00:30 UTCEG score recompute
  7. 2026-09-18 00:30 UTCGHSA enrichment
  8. 2026-09-17 19:32 UTCEPSS rescore
  9. 2026-09-17 12:57 UTCGHSA enrichment
  10. 2026-09-17 01:23 UTCEG score recompute
  11. 2026-09-17 01:23 UTCGHSA enrichment
  12. 2026-09-16 14:09 UTCEPSS rescore
  13. 2026-09-16 13:49 UTCEG score recompute
  14. 2026-09-16 13:49 UTCGHSA enrichment
  15. 2026-09-16 05:15 UTCEPSS rescore
  16. 2026-09-16 02:07 UTCGHSA enrichment
  17. 2026-09-15 14:34 UTCEG score recompute
  18. 2026-09-15 14:34 UTCGHSA enrichment
  19. 2026-09-15 13:43 UTCEG score recompute
  20. 2026-09-15 13:43 UTCGHSA enrichment
  21. 2026-09-15 09:53 UTCEG score recompute
  22. 2026-09-15 09:53 UTCGHSA enrichment
  23. 2026-09-14 22:19 UTCEG score recompute
  24. 2026-09-14 21:55 UTCEG score recompute
  25. 2026-09-14 21:54 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-91145?
CVE-2026-91145 is a high vulnerability published on September 14, 2026. Activiti through 7.1.0.M6 fails to validate hash-brace deferred expressions in process variables, allowing attackers to bypass expression filtering. Attackers can inject expressions beginning with #{ that are stored and later evaluated in the full Spring context when a mail task uses…
When was CVE-2026-91145 disclosed?
CVE-2026-91145 was first published in the National Vulnerability Database on September 14, 2026, with the most recent update on September 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91145 actively exploited?
CVE-2026-91145 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 84.2% of all scored CVEs.
What is the CVSS score of CVE-2026-91145?
CVE-2026-91145 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-91145?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-91145, 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

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