Vulnerability-Lookup

FKIE_CVE-2026-56733

Vulnerability from fkie_nvd - Published: 2026-09-25 18:17 - Updated: 2026-09-28 14:45

Severity

8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Summary

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2 and 7.1.0, this issue concerns a lack of discursive validation within the authorization cascade. It has been determined that the system-level enforcement of access restrictions during the initialization of new identity objects exhibits a discrepancy: Under specific conditions, the granular restrictions of the access key being used are overridden by the latent authorization authority of the parent account. Consequently, this means that the intended separation of functional areas is nullified, resulting in an uncontrolled expansion of administrative discretion. Due to this potential integrity breach of the entire trust environment, an immediate evaluation of the authorization hierarchies is imperative. Impact An attacker can create new administrator accounts despite token restrictions. This grants full access to all system data (tickets, customers, configuration) and allows the attacker to take complete control of the Zammad instance. Abuse Scenario The vulnerability stems from a lack of synergy between the token-based authorization logic and the target system's functional authorization hierarchy, which allows for iterative escalation of the privileged access context. This issue is fixed in versions 7.0.2 and 7.1.0.

References

	URL	Tags
	security-advisories@github.com	https://github.com/zammad/zammad/commit/e50ef69beab897317caa5e9490edba33aa1ac978
	security-advisories@github.com	https://github.com/zammad/zammad/commit/f059eb2d9835bdc2666750e805631f67ff485642
	security-advisories@github.com	https://github.com/zammad/zammad/releases/tag/7.0.2
	security-advisories@github.com	https://github.com/zammad/zammad/releases/tag/7.1.0
	security-advisories@github.com	https://github.com/zammad/zammad/security/advisories/GHSA-p3mg-2jxr-hww2

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "zammad",
          "vendor": "zammad",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 7.0.2"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2 and 7.1.0, this issue concerns a lack of discursive validation within the authorization cascade. It has been determined that the system-level enforcement of access restrictions during the initialization of new identity objects exhibits a discrepancy: Under specific conditions, the granular restrictions of the access key being used are overridden by the latent authorization authority of the parent account. Consequently, this means that the intended separation of functional areas is nullified, resulting in an uncontrolled expansion of administrative discretion. Due to this potential integrity breach of the entire trust environment, an immediate evaluation of the authorization hierarchies is imperative. Impact An attacker can create new administrator accounts despite token restrictions. This grants full access to all system data (tickets, customers, configuration) and allows the attacker to take complete control of the Zammad instance. Abuse Scenario The vulnerability stems from a lack of synergy between the token-based authorization logic and the target system\u0027s functional authorization hierarchy, which allows for iterative escalation of the privileged access context. This issue is fixed in versions 7.0.2 and 7.1.0."
    }
  ],
  "id": "CVE-2026-56733",
  "lastModified": "2026-09-28T14:45:39.697",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.7,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-56733",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-25T18:37:36.822447Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-25T18:17:27.533",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/zammad/zammad/commit/e50ef69beab897317caa5e9490edba33aa1ac978"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/zammad/zammad/commit/f059eb2d9835bdc2666750e805631f67ff485642"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/zammad/zammad/releases/tag/7.0.2"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/zammad/zammad/releases/tag/7.1.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/zammad/zammad/security/advisories/GHSA-p3mg-2jxr-hww2"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-269"
        },
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

CVE-2026-56733 (GCVE-0-2026-56733)

Vulnerability from cvelistv5 – Published: 2026-09-25 17:05 – Updated: 2026-09-25 18:37

Title

Zammad: Incorrect Authorization and Improper Privilege Management

Summary

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-25 18:37 UTC

CWE

CWE-269 - Improper Privilege Management
CWE-863 - Incorrect Authorization

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7565 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/zammad/zammad/security/advisor…	x_refsource_CONFIRM
https://github.com/zammad/zammad/commit/e50ef69be…	x_refsource_MISC
https://github.com/zammad/zammad/commit/f059eb2d9…	x_refsource_MISC
https://github.com/zammad/zammad/releases/tag/7.0.2	x_refsource_MISC
https://github.com/zammad/zammad/releases/tag/7.1.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
zammad	zammad	Affected: < 7.0.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-56733",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-25T18:37:36.822447Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-25T18:37:48.132Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "zammad",
          "vendor": "zammad",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 7.0.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2 and 7.1.0, this issue concerns a lack of discursive validation within the authorization cascade. It has been determined that the system-level enforcement of access restrictions during the initialization of new identity objects exhibits a discrepancy: Under specific conditions, the granular restrictions of the access key being used are overridden by the latent authorization authority of the parent account. Consequently, this means that the intended separation of functional areas is nullified, resulting in an uncontrolled expansion of administrative discretion. Due to this potential integrity breach of the entire trust environment, an immediate evaluation of the authorization hierarchies is imperative. Impact An attacker can create new administrator accounts despite token restrictions. This grants full access to all system data (tickets, customers, configuration) and allows the attacker to take complete control of the Zammad instance. Abuse Scenario The vulnerability stems from a lack of synergy between the token-based authorization logic and the target system\u0027s functional authorization hierarchy, which allows for iterative escalation of the privileged access context. This issue is fixed in versions 7.0.2 and 7.1.0."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-269",
              "description": "CWE-269: Improper Privilege Management",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T17:05:56.215Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/zammad/zammad/security/advisories/GHSA-p3mg-2jxr-hww2",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/zammad/zammad/security/advisories/GHSA-p3mg-2jxr-hww2"
        },
        {
          "name": "https://github.com/zammad/zammad/commit/e50ef69beab897317caa5e9490edba33aa1ac978",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/zammad/zammad/commit/e50ef69beab897317caa5e9490edba33aa1ac978"
        },
        {
          "name": "https://github.com/zammad/zammad/commit/f059eb2d9835bdc2666750e805631f67ff485642",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/zammad/zammad/commit/f059eb2d9835bdc2666750e805631f67ff485642"
        },
        {
          "name": "https://github.com/zammad/zammad/releases/tag/7.0.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/zammad/zammad/releases/tag/7.0.2"
        },
        {
          "name": "https://github.com/zammad/zammad/releases/tag/7.1.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/zammad/zammad/releases/tag/7.1.0"
        }
      ],
      "source": {
        "advisory": "GHSA-p3mg-2jxr-hww2",
        "discovery": "UNKNOWN"
      },
      "title": "Zammad: Incorrect Authorization and Improper Privilege Management"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-56733",
    "datePublished": "2026-09-25T17:05:56.215Z",
    "dateReserved": "2026-06-22T19:17:28.959Z",
    "dateUpdated": "2026-09-25T18:37:48.132Z",
    "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.
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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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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FKIE_CVE-2026-56733

CVE-2026-56733 (GCVE-0-2026-56733)

Tags

Sightings

Nomenclature

Related by attack behaviour