{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-15243",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-24T12:33:47.532505Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-24T12:33:58.681Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Java Apereo CAS Client",
          "repo": "https://github.com/apereo/java-cas-client",
          "vendor": "Apereo",
          "versions": [
            {
              "status": "affected",
              "version": "4.1.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://mvnrepository.com/",
          "defaultStatus": "unknown",
          "packageName": "org.jasig.cas.client",
          "product": "Jasig CAS Client",
          "repo": "https://github.com/apereo/java-cas-client",
          "vendor": "Apereo",
          "versions": [
            {
              "status": "affected",
              "version": "3.6.4"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Rafa\u0142 \u0141ykowski (Qualtrics)"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "\u0141ukasz Kollbek (Qualtrics)"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Krzysztof Sur\u00f3wka (Qualtrics)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Apereo CAS Client\u0026nbsp;accepts any CA-trusted certificate for any hostname, provided the URL the client is calling matches the configured allowlist or regex. An attacker with a MITM position (DNS poisoning, rogue Wi-Fi, malicious proxy, etc.) can provide any CA-signed certificate for a hostname that matches the configured allowlist or regex. This can lead to\u003cspan\u003e\u0026nbsp;intercepting the CAS exchange, capturing the\u0026nbsp;\u003c/span\u003eTicket-Granting Ticket (\u003cspan\u003eTGT), and subsequently obtaining Service Tickets on behalf of the victim.\u0026nbsp;\u003c/span\u003e\u003cdiv\u003e\u003cdiv\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cdiv\u003eBecause maintainers contact attempts were unsuccessful, vulnerabilities have only been confirmed in version 4.1.0 (Java Apereo CAS Client) and\u0026nbsp;3.6.4 (Jasig CAS Client) but may also affect other versions.\u003c/div\u003e\u003c/div\u003e\u003c/div\u003e"
            }
          ],
          "value": "Apereo CAS Client\u00a0accepts any CA-trusted certificate for any hostname, provided the URL the client is calling matches the configured allowlist or regex. An attacker with a MITM position (DNS poisoning, rogue Wi-Fi, malicious proxy, etc.) can provide any CA-signed certificate for a hostname that matches the configured allowlist or regex. This can lead to\u00a0intercepting the CAS exchange, capturing the\u00a0Ticket-Granting Ticket (TGT), and subsequently obtaining Service Tickets on behalf of the victim.\u00a0\n\n\nBecause maintainers contact attempts were unsuccessful, vulnerabilities have only been confirmed in version 4.1.0 (Java Apereo CAS Client) and\u00a03.6.4 (Jasig CAS Client) but may also affect other versions."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "ACTIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-297",
              "description": "CWE-297 Improper validation of certificate with host mismatch",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-24T11:29:26.067Z",
        "orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
        "shortName": "CERT-PL"
      },
      "references": [
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://cert.pl/en/posts/2026/07/CVE-2026-15243"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://www.apereo.org/programs/software/cas"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "tags": [
        "x_open-source"
      ],
      "title": "Improper Validation of Certificate in CAS Client",
      "x_generator": {
        "engine": "Vulnogram 1.0.3"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
    "assignerShortName": "CERT-PL",
    "cveId": "CVE-2026-15243",
    "datePublished": "2026-07-24T11:29:26.067Z",
    "dateReserved": "2026-07-09T11:56:55.414Z",
    "dateUpdated": "2026-07-24T12:33:58.681Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}