CVE-2026-75524 (GCVE-0-2026-75524)

Vulnerability from cvelistv5 – Published: 2026-10-23 20:29 – Updated: 2026-10-23 20:29
VLAI
Title
OpenReception: race condition in add-to-tunnel and create-new-client allows overlapping appointments for one agent
Summary
OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform. Prior to version 2.2.2, an attacker overbooks an agent, placing multiple appointments into a single time slot that the system is designed to keep exclusive. The number of overlapping appointments equals the number of concurrent requests, and one booking token is enough because the token is consumed after the insert. This results in the integrity of the booking-calendar breaking and availability being denied to other clients. This issue has been patched in version 2.2.2.
Severity
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7797 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
open-reception appointment-booking-software Affected: < 2.2.2
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "appointment-booking-software",
          "vendor": "open-reception",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.2.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "OpenReception\u0027s appointment booking software provides an end-to-end encrypted appointment booking platform. Prior to version 2.2.2, an attacker overbooks an agent, placing multiple appointments into a single time slot that the system is designed to keep exclusive. The number of overlapping appointments equals the number of concurrent requests, and one booking token is enough because the token is consumed after the insert. This results in the integrity of the booking-calendar breaking and availability being denied to other clients. This issue has been patched in version 2.2.2."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.4,
            "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:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-367",
              "description": "CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T20:29:52.583Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/open-reception/appointment-booking-software/security/advisories/GHSA-q452-m9pf-qj9j",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/open-reception/appointment-booking-software/security/advisories/GHSA-q452-m9pf-qj9j"
        },
        {
          "name": "https://github.com/open-reception/appointment-booking-software/commit/73663288a8d4ad2ad31d897dc1f494ace2f0e452",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/open-reception/appointment-booking-software/commit/73663288a8d4ad2ad31d897dc1f494ace2f0e452"
        },
        {
          "name": "https://github.com/open-reception/appointment-booking-software/releases/tag/v2.2.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/open-reception/appointment-booking-software/releases/tag/v2.2.2"
        }
      ],
      "source": {
        "advisory": "GHSA-q452-m9pf-qj9j",
        "discovery": "UNKNOWN"
      },
      "title": "OpenReception: race condition in add-to-tunnel and create-new-client allows overlapping appointments for one agent"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-75524",
    "datePublished": "2026-10-23T20:29:52.583Z",
    "dateReserved": "2026-08-17T20:49:21.600Z",
    "dateUpdated": "2026-10-23T20:29:52.583Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-75524",
      "date": "2026-10-26",
      "epss": "0.00186",
      "percentile": "0.08128"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "appointment-booking-software",
                "vendor": "open-reception",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 2.2.2"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "OpenReception\u0027s appointment booking software provides an end-to-end encrypted appointment booking platform. Prior to version 2.2.2, an attacker overbooks an agent, placing multiple appointments into a single time slot that the system is designed to keep exclusive. The number of overlapping appointments equals the number of concurrent requests, and one booking token is enough because the token is consumed after the insert. This results in the integrity of the booking-calendar breaking and availability being denied to other clients. This issue has been patched in version 2.2.2."
          }
        ],
        "id": "CVE-2026-75524",
        "lastModified": "2026-10-26T13:48:06.970",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "LOW",
                "baseScore": 5.4,
                "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:L",
                "version": "3.1"
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              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-23T21:17:25.010",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/open-reception/appointment-booking-software/commit/73663288a8d4ad2ad31d897dc1f494ace2f0e452"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/open-reception/appointment-booking-software/releases/tag/v2.2.2"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/open-reception/appointment-booking-software/security/advisories/GHSA-q452-m9pf-qj9j"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-367"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    }
  }
}



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