CVE-2026-0543 (GCVE-0-2026-0543)

Vulnerability from cvelistv5 – Published: 2026-01-13 21:10 – Updated: 2026-01-13 21:25
VLAI?
Title
Improper Input Validation in Kibana Email Connector Leading to Excessive Allocation
Summary
Improper Input Validation (CWE-20) in Kibana's Email Connector can allow an attacker to cause an Excessive Allocation (CAPEC-130) through a specially crafted email address parameter. This requires an attacker to have authenticated access with view-level privileges sufficient to execute connector actions. The application attempts to process specially crafted email format, resulting in complete service unavailability for all users until manual restart is performed.
Severity ?
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-20 - Improper Input Validation
Assigner
References
Impacted products
Vendor Product Version
Elastic Kibana Affected: 8.0.0 , ≤ 8.19.9 (semver)
Affected: 7.0.0 , ≤ 7.17.29 (semver)
Affected: 9.0.0 , ≤ 9.1.9 (semver)
Affected: 9.2.0 , ≤ 9.2.3 (semver)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-0543",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-13T21:22:53.219447Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-13T21:25:59.853Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Kibana",
          "vendor": "Elastic",
          "versions": [
            {
              "lessThanOrEqual": "8.19.9",
              "status": "affected",
              "version": "8.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.17.29",
              "status": "affected",
              "version": "7.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "9.1.9",
              "status": "affected",
              "version": "9.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "9.2.3",
              "status": "affected",
              "version": "9.2.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eImproper Input Validation (CWE-20) in Kibana\u0027s Email Connector can allow an attacker to cause an Excessive Allocation (CAPEC-130) through a specially crafted email address parameter. This requires an attacker to have authenticated access with view-level privileges sufficient to execute connector actions. The application attempts to process specially crafted email format, resulting in complete service unavailability for all users until manual restart is performed.\u003c/p\u003e"
            }
          ],
          "value": "Improper Input Validation (CWE-20) in Kibana\u0027s Email Connector can allow an attacker to cause an Excessive Allocation (CAPEC-130) through a specially crafted email address parameter. This requires an attacker to have authenticated access with view-level privileges sufficient to execute connector actions. The application attempts to process specially crafted email format, resulting in complete service unavailability for all users until manual restart is performed."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-664",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-664 Server Side Request Forgery"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-20",
              "description": "CWE-20 Improper Input Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-13T21:10:38.663Z",
        "orgId": "271b6943-45a9-4f3a-ab4e-976f3fa05b5a",
        "shortName": "elastic"
      },
      "references": [
        {
          "url": "https://discuss.elastic.co/t/kibana-8-19-10-9-1-10-9-2-4-security-update-esa-2026-08/384523"
        }
      ],
      "source": {
        "discovery": "Elastic"
      },
      "title": "Improper Input Validation in Kibana Email Connector Leading to Excessive Allocation",
      "x_generator": {
        "engine": "Elastic CVE Publisher 0.0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "271b6943-45a9-4f3a-ab4e-976f3fa05b5a",
    "assignerShortName": "elastic",
    "cveId": "CVE-2026-0543",
    "datePublished": "2026-01-13T21:10:38.663Z",
    "dateReserved": "2025-12-31T12:02:48.756Z",
    "dateUpdated": "2026-01-13T21:25:59.853Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-0543\",\"sourceIdentifier\":\"security@elastic.co\",\"published\":\"2026-01-13T21:15:51.170\",\"lastModified\":\"2026-01-14T16:25:40.430\",\"vulnStatus\":\"Undergoing Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Improper Input Validation (CWE-20) in Kibana\u0027s Email Connector can allow an attacker to cause an Excessive Allocation (CAPEC-130) through a specially crafted email address parameter. This requires an attacker to have authenticated access with view-level privileges sufficient to execute connector actions. The application attempts to process specially crafted email format, resulting in complete service unavailability for all users until manual restart is performed.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security@elastic.co\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":6.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"security@elastic.co\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-20\"}]}],\"references\":[{\"url\":\"https://discuss.elastic.co/t/kibana-8-19-10-9-1-10-9-2-4-security-update-esa-2026-08/384523\",\"source\":\"security@elastic.co\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-0543\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-13T21:22:53.219447Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-13T21:25:53.582Z\"}}], \"cna\": {\"title\": \"Improper Input Validation in Kibana Email Connector Leading to Excessive Allocation\", \"source\": {\"discovery\": \"Elastic\"}, \"impacts\": [{\"capecId\": \"CAPEC-664\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-664 Server Side Request Forgery\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 6.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Elastic\", \"product\": \"Kibana\", \"versions\": [{\"status\": \"affected\", \"version\": \"8.0.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.19.9\"}, {\"status\": \"affected\", \"version\": \"7.0.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.17.29\"}, {\"status\": \"affected\", \"version\": \"9.0.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"9.1.9\"}, {\"status\": \"affected\", \"version\": \"9.2.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"9.2.3\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://discuss.elastic.co/t/kibana-8-19-10-9-1-10-9-2-4-security-update-esa-2026-08/384523\"}], \"x_generator\": {\"engine\": \"Elastic CVE Publisher 0.0.1\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Improper Input Validation (CWE-20) in Kibana\u0027s Email Connector can allow an attacker to cause an Excessive Allocation (CAPEC-130) through a specially crafted email address parameter. This requires an attacker to have authenticated access with view-level privileges sufficient to execute connector actions. The application attempts to process specially crafted email format, resulting in complete service unavailability for all users until manual restart is performed.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eImproper Input Validation (CWE-20) in Kibana\u0027s Email Connector can allow an attacker to cause an Excessive Allocation (CAPEC-130) through a specially crafted email address parameter. This requires an attacker to have authenticated access with view-level privileges sufficient to execute connector actions. The application attempts to process specially crafted email format, resulting in complete service unavailability for all users until manual restart is performed.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-20\", \"description\": \"CWE-20 Improper Input Validation\"}]}], \"providerMetadata\": {\"orgId\": \"271b6943-45a9-4f3a-ab4e-976f3fa05b5a\", \"shortName\": \"elastic\", \"dateUpdated\": \"2026-01-13T21:10:38.663Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-0543\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-13T21:25:59.853Z\", \"dateReserved\": \"2025-12-31T12:02:48.756Z\", \"assignerOrgId\": \"271b6943-45a9-4f3a-ab4e-976f3fa05b5a\", \"datePublished\": \"2026-01-13T21:10:38.663Z\", \"assignerShortName\": \"elastic\"}",
      "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.