{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "wekan",
          "vendor": "wekan",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 9.07"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Wekan is open source kanban built with Meteor. Prior to 9.07, Wekan avatar upload functionality embeds user-supplied filenames into paths later passed to child_process.exec() for MIME-type detection. Because models/avatars.js and models/fileValidation.js used a shell command with the avatar filename, shell metacharacters such as backticks and $() in the filename could execute commands on the server. This issue is fixed in version 9.07."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.9,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-78",
              "description": "CWE-78: Improper Neutralization of Special Elements used in an OS Command (\u0027OS Command Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-88",
              "description": "CWE-88: Improper Neutralization of Argument Delimiters in a Command (\u0027Argument Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-15T21:08:02.223Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/wekan/wekan/security/advisories/GHSA-35j7-h385-2q9g",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/wekan/wekan/security/advisories/GHSA-35j7-h385-2q9g"
        },
        {
          "name": "https://github.com/wekan/wekan/commit/a4c74a5980e9f778eb444fd346f32aa3d16786a9",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/wekan/wekan/commit/a4c74a5980e9f778eb444fd346f32aa3d16786a9"
        },
        {
          "name": "https://github.com/wekan/wekan/releases/tag/v9.07",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/wekan/wekan/releases/tag/v9.07"
        }
      ],
      "source": {
        "advisory": "GHSA-35j7-h385-2q9g",
        "discovery": "UNKNOWN"
      },
      "title": "Wekan: Shell Injection via Avatar Upload"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-52891",
    "datePublished": "2026-07-15T21:08:02.223Z",
    "dateReserved": "2026-06-08T21:44:27.365Z",
    "dateUpdated": "2026-07-15T21:08:02.223Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-52891",
      "date": "2026-07-16",
      "epss": "0.00403",
      "percentile": "0.32559"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-52891\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-07-15T22:17:16.450\",\"lastModified\":\"2026-07-16T13:43:05.487\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Wekan is open source kanban built with Meteor. Prior to 9.07, Wekan avatar upload functionality embeds user-supplied filenames into paths later passed to child_process.exec() for MIME-type detection. Because models/avatars.js and models/fileValidation.js used a shell command with the avatar filename, shell metacharacters such as backticks and $() in the filename could execute commands on the server. This issue is fixed in version 9.07.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"wekan\",\"product\":\"wekan\",\"versions\":[{\"version\":\"\u003c 9.07\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":9.9,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.1,\"impactScore\":6.0}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-78\"},{\"lang\":\"en\",\"value\":\"CWE-88\"}]}],\"references\":[{\"url\":\"https://github.com/wekan/wekan/commit/a4c74a5980e9f778eb444fd346f32aa3d16786a9\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/wekan/wekan/releases/tag/v9.07\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/wekan/wekan/security/advisories/GHSA-35j7-h385-2q9g\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}