CVE-2026-33456 (GCVE-0-2026-33456)

Vulnerability from cvelistv5 – Published: 2026-04-10 08:31 – Updated: 2026-04-14 13:29
VLAI?
Title
Potential livestatus injection in notification test
Summary
Livestatus injection in the notification test mode in Checkmk <2.5.0b4 and <2.4.0p26 allows an authenticated user with access to the notification test page to inject arbitrary Livestatus commands via a crafted service description.
Severity ?
5.1 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
CWE
  • CWE-140 - Improper Neutralization of Delimiters
Assigner
References
Impacted products
Vendor Product Version
Checkmk GmbH Checkmk Affected: 2.5.0 , < 2.5.0b4 (semver)
Affected: 2.4.0 , < 2.4.0p26 (semver)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33456",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-14T03:55:37.035774Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-14T13:29:54.362Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Checkmk",
          "vendor": "Checkmk GmbH",
          "versions": [
            {
              "lessThan": "2.5.0b4",
              "status": "affected",
              "version": "2.5.0",
              "versionType": "semver"
            },
            {
              "lessThan": "2.4.0p26",
              "status": "affected",
              "version": "2.4.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "2.5.0b4",
                  "versionStartIncluding": "2.5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "2.4.0p26",
                  "versionStartIncluding": "2.4.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Livestatus injection in the notification test mode in Checkmk \u003c2.5.0b4 and \u003c2.4.0p26 allows an authenticated user with access to the notification test page to inject arbitrary Livestatus commands via a crafted service description."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-15",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-15: Command Delimiters"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 5.1,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N",
            "version": "4.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-140",
              "description": "CWE-140: Improper Neutralization of Delimiters",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-10T08:31:27.807Z",
        "orgId": "f7d6281c-4801-44ce-ace2-493291dedb0f",
        "shortName": "Checkmk"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://checkmk.com/werk/17989"
        }
      ],
      "title": "Potential livestatus injection in notification test"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f7d6281c-4801-44ce-ace2-493291dedb0f",
    "assignerShortName": "Checkmk",
    "cveId": "CVE-2026-33456",
    "datePublished": "2026-04-10T08:31:27.807Z",
    "dateReserved": "2026-03-20T10:30:13.353Z",
    "dateUpdated": "2026-04-14T13:29:54.362Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-33456",
      "date": "2026-04-21",
      "epss": "0.00041",
      "percentile": "0.1241"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-33456\",\"sourceIdentifier\":\"security@checkmk.com\",\"published\":\"2026-04-10T09:16:24.493\",\"lastModified\":\"2026-04-20T17:10:06.623\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Livestatus injection in the notification test mode in Checkmk \u003c2.5.0b4 and \u003c2.4.0p26 allows an authenticated user with access to the notification test page to inject arbitrary Livestatus commands via a crafted service description.\"}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"security@checkmk.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/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\",\"baseScore\":5.1,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"LOW\",\"vulnIntegrityImpact\":\"LOW\",\"vulnAvailabilityImpact\":\"LOW\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H\",\"baseScore\":7.6,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":4.7}]},\"weaknesses\":[{\"source\":\"security@checkmk.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-140\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"022C075A-4B04-4141-A7D7-F93C9A7CE0FD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:b1:*:*:*:*:*:*\",\"matchCriteriaId\":\"60C00469-0CD1-4E9C-8370-CE113842056C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:b2:*:*:*:*:*:*\",\"matchCriteriaId\":\"179905FC-821F-4214-A872-E4E3702419D1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:b3:*:*:*:*:*:*\",\"matchCriteriaId\":\"04956994-D5A8-45EE-9DC2-8A1D3058CE8E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:b4:*:*:*:*:*:*\",\"matchCriteriaId\":\"8868449B-7259-4C3B-8344-0EFE0BA3A97E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:b5:*:*:*:*:*:*\",\"matchCriteriaId\":\"BBDF3A13-582F-43D2-B42F-0DC42D4FBFBA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:b6:*:*:*:*:*:*\",\"matchCriteriaId\":\"DAF500B3-AA6A-4618-BC7E-0F214B795E0F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p1:*:*:*:*:*:*\",\"matchCriteriaId\":\"1CFE68AB-1F57-497C-9229-29ED3A73D87F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p10:*:*:*:*:*:*\",\"matchCriteriaId\":\"577F9F72-2FDA-4F87-A840-05158F2368B8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p11:*:*:*:*:*:*\",\"matchCriteriaId\":\"6F3AD894-660B-41FC-B910-899A764A00B6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p12:*:*:*:*:*:*\",\"matchCriteriaId\":\"21853BB4-1BB5-40E3-82E2-253899D898ED\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p13:*:*:*:*:*:*\",\"matchCriteriaId\":\"E7963D66-A89A-4167-A2BA-DFF89B439EAE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p14:*:*:*:*:*:*\",\"matchCriteriaId\":\"42099281-2026-4507-A20B-C669C206ADB6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p15:*:*:*:*:*:*\",\"matchCriteriaId\":\"29A44B1E-83CD-4A3D-AFFD-82AAC7760293\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p16:*:*:*:*:*:*\",\"matchCriteriaId\":\"B4B87192-D81E-4269-ABF3-8D700BB531B0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p17:*:*:*:*:*:*\",\"matchCriteriaId\":\"3D35CD46-F8CF-49C3-8CD9-53E1ED038023\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p18:*:*:*:*:*:*\",\"matchCriteriaId\":\"D5B5649C-C0BA-4905-98DD-CA606DD2B886\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p19:*:*:*:*:*:*\",\"matchCriteriaId\":\"29148EA6-675F-4B35-81BF-B8254C1EB675\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p2:*:*:*:*:*:*\",\"matchCriteriaId\":\"B11306B4-1092-470C-BA87-DBD02A18A74B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p20:*:*:*:*:*:*\",\"matchCriteriaId\":\"9E85F65E-A103-425E-8AD5-7EE9F093B463\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p21:*:*:*:*:*:*\",\"matchCriteriaId\":\"65DF329A-4E2D-4138-99C5-6765789051CB\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p22:*:*:*:*:*:*\",\"matchCriteriaId\":\"1B9B340D-84F6-4CE9-A627-E26F340B3705\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p23:*:*:*:*:*:*\",\"matchCriteriaId\":\"CCAD0F84-7273-4FDF-B238-177E1C4D5F5B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p24:*:*:*:*:*:*\",\"matchCriteriaId\":\"860D2E5C-6277-44F5-A3FE-C085F76B8514\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p25:*:*:*:*:*:*\",\"matchCriteriaId\":\"FAEB7D48-C80F-4804-8E76-C950B9714533\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p3:*:*:*:*:*:*\",\"matchCriteriaId\":\"74F78C48-030A-48A1-B69E-04C4EA5CCC12\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p4:*:*:*:*:*:*\",\"matchCriteriaId\":\"8701A914-774B-4E3B-A651-4A9FD19A187A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p5:*:*:*:*:*:*\",\"matchCriteriaId\":\"19E40054-C44D-4C4C-B077-0333D8201E5B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p6:*:*:*:*:*:*\",\"matchCriteriaId\":\"0E2D2F49-32B2-42AA-B99E-7C39403CF104\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p7:*:*:*:*:*:*\",\"matchCriteriaId\":\"ACE440F8-EBF5-4DBB-A215-57D770C66219\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p8:*:*:*:*:*:*\",\"matchCriteriaId\":\"1A94395D-DDCE-4977-89CA-46F71C3CA2B8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.4.0:p9:*:*:*:*:*:*\",\"matchCriteriaId\":\"9513876C-8DF0-4A59-864F-8401BAA43376\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.5.0:b1:*:*:*:*:*:*\",\"matchCriteriaId\":\"F8943BB3-1487-494C-B4EB-89EB0B18B6A2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.5.0:b2:*:*:*:*:*:*\",\"matchCriteriaId\":\"5342045D-CB9F-4663-9538-8B657C9AC833\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:checkmk:checkmk:2.5.0:b3:*:*:*:*:*:*\",\"matchCriteriaId\":\"E9566834-D4EE-4104-AD60-7988FCF17224\"}]}]}],\"references\":[{\"url\":\"https://checkmk.com/werk/17989\",\"source\":\"security@checkmk.com\",\"tags\":[\"Vendor Advisory\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-33456\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-14T03:55:37.035774Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-10T12:47:46.627Z\"}}], \"cna\": {\"title\": \"Potential livestatus injection in notification test\", \"impacts\": [{\"capecId\": \"CAPEC-15\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-15: Command Delimiters\"}]}], \"metrics\": [{\"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 5.1, \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N\"}}], \"affected\": [{\"vendor\": \"Checkmk GmbH\", \"product\": \"Checkmk\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.5.0\", \"lessThan\": \"2.5.0b4\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"2.4.0\", \"lessThan\": \"2.4.0p26\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://checkmk.com/werk/17989\", \"tags\": [\"vendor-advisory\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Livestatus injection in the notification test mode in Checkmk \u003c2.5.0b4 and \u003c2.4.0p26 allows an authenticated user with access to the notification test page to inject arbitrary Livestatus commands via a crafted service description.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-140\", \"description\": \"CWE-140: Improper Neutralization of Delimiters\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.5.0b4\", \"versionStartIncluding\": \"2.5.0\"}, {\"criteria\": \"cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.4.0p26\", \"versionStartIncluding\": \"2.4.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"f7d6281c-4801-44ce-ace2-493291dedb0f\", \"shortName\": \"Checkmk\", \"dateUpdated\": \"2026-04-10T08:31:27.807Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-33456\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-14T13:29:54.362Z\", \"dateReserved\": \"2026-03-20T10:30:13.353Z\", \"assignerOrgId\": \"f7d6281c-4801-44ce-ace2-493291dedb0f\", \"datePublished\": \"2026-04-10T08:31:27.807Z\", \"assignerShortName\": \"Checkmk\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.