TI-2026-61906 Aliases CVE-2026-91145 GHSA-2x64-98jc-j98r

Activiti through 7.1.0.M6 Expression Injection via Mail Task

MEDIUM 64CWE-917Published 2026-09-14 · Updated 2026-09-24

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: High · Low · None
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-917.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00422 36th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Activiti	Activiti	up to 7.1.0.M6	—	No fix listed	CNA

Activiti VendorActiviti Affected up to 7.1.0.M6 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-91145
2026-10-03 Alias added: GHSA-2x64-98jc-j98r

References

Other 4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences