{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:composer/admidio/admidio",
          "product": "admidio",
          "vendor": "admidio",
          "versions": [
            {
              "lessThan": "5.0.17",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
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      "cpeApplicability": [
        {
          "nodes": [
            {
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                  "criteria": "cpe:2.3:a:admidio:admidio:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.0.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "gwangwon0807"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "choewonwoo1817"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "J0hnathanKim"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Kamba-netizen"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "t-211"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "xo0102"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Fasse"
        }
      ],
      "datePublic": "2026-10-08T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Admidio before 5.0.17 contains an improper access control vulnerability that allows authenticated members to register event guests by submitting the additional_guests field when guests are disallowed. Attackers can set additional_guests to the remaining seat count in modules/events/events_function.php to exhaust event capacity and block other members from registering."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "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:N/VI:L/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
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            "attackVector": "NETWORK",
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            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-602",
              "description": "Client-Side Enforcement of Server-Side Security",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-27T13:07:50.357Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Issue #2231",
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/Admidio/admidio/issues/2231"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/Admidio/admidio"
        },
        {
          "name": "GitHub Security Advisory (GHSA-92g9-59rr-c3qg)",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/Admidio/admidio/security/advisories/GHSA-92g9-59rr-c3qg"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/Admidio/admidio/commit/5b0ee3585d2a69a6e85fee00b7b93f3ebc1e44d9"
        },
        {
          "name": "admidio v5.0.17 Release Notes",
          "tags": [
            "release-notes"
          ],
          "url": "https://github.com/Admidio/admidio/releases/tag/v5.0.17"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/Admidio/admidio/blob/v5.0.16/modules/events/events_function.php#L446-L462"
        },
        {
          "name": "VulnCheck Advisory: Admidio before 5.0.17 Event Guest Restriction Bypass via events_function.php",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/admidio-before-5.0.17-event-guest-restriction-bypass-via-events-function-php"
        }
      ],
      "title": "Admidio before 5.0.17 Event Guest Restriction Bypass via events_function.php",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-117554",
    "datePublished": "2026-10-27T13:07:50.357Z",
    "dateReserved": "2026-10-27T11:25:20.165Z",
    "dateUpdated": "2026-10-27T13:07:50.357Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}