EUVD-2026-78168
GHSA-2x64-98jc-j98r
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable but requires authenticated low-privilege user; no scope change as bean invocation stays within the same Spring application; high confidentiality from bean data access, low integrity from limited write exposure.
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Expression Language injection in Activiti through 7.1.0.M6 allows authenticated users to execute arbitrary code within the Spring application context. The ExpressionResolver fails to validate hash-brace deferred expressions (#{...}) when stored as process variables, meaning crafted payloads bypass the existing expression filter. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) an authenticated session with privileges to write or influence process variable values - anonymous or external attackers cannot exploit this directly; (2) the target Activiti deployment must have at least one process definition containing a mail task whose body, subject, or recipient fields are populated from process variables rather than static values; (3) the attacker must be able to trigger execution of that process (start a process instance or advance it to the mail task step). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 7.1 (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L) reflects moderate-to-high risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch has been identified at time of analysis - the input data references only the upstream GitHub repository and issue tracker, not a tagged fixed release. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Immediately audit and restrict process variable creation permissions across all Activiti instances to only essential administrators; document all accounts with variable write access and verify their necessity. …
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External POC / Exploit Code
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