Vulnerability-Lookup

GHSA-2X64-98JC-J98R

Vulnerability from github – Published: 2026-09-15 00:31 – Updated: 2026-09-15 00:31

Details

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.

Severity

7.1 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

7.1 (High)


                  
                    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

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-91145"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-917"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-14T22:16:59Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-2x64-98jc-j98r",
  "modified": "2026-09-15T00:31:13Z",
  "published": "2026-09-15T00:31:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91145"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Activiti/Activiti/issues/5438"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Activiti/Activiti"
    },
    {
      "type": "WEB",
      "url": "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"
    },
    {
      "type": "WEB",
      "url": "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"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/activiti-through-7.1.0-m6-expression-injection-via-mail-task"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-91145 (GCVE-0-2026-91145)

Vulnerability from cvelistv5 – Published: 2026-09-14 21:45 – Updated: 2026-09-15 13:37

Title

Activiti through 7.1.0.M6 Expression Injection via Mail Task

Summary

Severity

7.1 (High)


                        
                          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

7.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 13:37 UTC

CWE

CWE-917 - Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')

Assigner

VulnCheck mitre root

References

5 references

URL	Tags
https://github.com/Activiti/Activiti/issues/5438	issue-tracking
https://github.com/Activiti/Activiti	product
https://github.com/Activiti/Activiti/blob/7.1.0.M…	technical-description
https://github.com/Activiti/Activiti/blob/7.1.0.M…	technical-description
https://www.vulncheck.com/advisories/activiti-thr…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
Activiti	Activiti	Affected: 0 , ≤ 7.1.0.M6 (custom)

Date Public

2026-06-13 00:00

Credits

George Chen

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-91145",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-15T13:37:15.686978Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-15T13:37:55.083Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/Activiti/Activiti/issues/5438"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:maven/org.activiti/activiti-engine",
          "product": "Activiti",
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          "vendor": "Activiti",
          "versions": [
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              "lessThanOrEqual": "7.1.0.M6",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
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        }
      ],
      "credits": [
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          "lang": "en",
          "type": "reporter",
          "value": "George Chen"
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      ],
      "datePublic": "2026-06-13T00:00:00.000Z",
      "descriptions": [
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          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
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          "cvssV4_0": {
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            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
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            "subConfidentialityImpact": "NONE",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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          "url": "https://github.com/Activiti/Activiti/issues/5438"
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          "tags": [
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        },
        {
          "name": "VulnCheck Advisory: Activiti through 7.1.0.M6 Expression Injection via Mail Task",
          "tags": [
            "third-party-advisory"
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          "url": "https://www.vulncheck.com/advisories/activiti-through-7.1.0-m6-expression-injection-via-mail-task"
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    "datePublished": "2026-09-14T21:45:45.317Z",
    "dateReserved": "2026-09-14T20:35:44.937Z",
    "dateUpdated": "2026-09-15T13:37:55.083Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-2X64-98JC-J98R

CVE-2026-91145 (GCVE-0-2026-91145)

Tags

Sightings

Nomenclature