{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2026-102489",
  "revision": 1,
  "title": "Zammad — Session Fixation to RCE",
  "summary": "A session hijack flaw in Zammad 6.3.0 to 6.5.4 leads to RCE as the zammad user. Versions 7.0.0 to 7.1.2 contain the bug but it cannot be exploited there. It can be chained with CVE-2026-102490 to reach root.",
  "source_type": "cve",
  "severity": "critical",
  "cvss": {
    "score": 9.8,
    "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "version": "3.1"
  },
  "epss": 0.22478,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": false,
    "attack_complexity": "low",
    "kev_added": "2026-10-02",
    "kev_due": "2026-10-05",
    "prerequisites": "Network access to a Zammad 6.3.0 to 6.5.4 instance."
  },
  "kill_chain": "initial_access",
  "recommended_action": "Follow Zammad's advisory for CVE-2026-102489 and CVE-2026-102490 and move off Zammad 6.3.0 to 6.5.4.",
  "confidence": "high",
  "provenance": [
    {
      "fields": [
        "cvss",
        "exploitation.attack_complexity",
        "exploitation.exploit_available",
        "published_at",
        "references"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2026-102489",
      "retrieved_at": "2026-11-05T08:06:18.021Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "exploitation.known_exploited",
        "exploitation.kev_added",
        "exploitation.kev_due"
      ],
      "source": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "retrieved_at": "2026-11-05T08:06:18.021Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "epss"
      ],
      "source": "https://api.first.org/data/v1/epss?cve=CVE-2026-102489",
      "retrieved_at": "2026-11-05T08:06:18.021Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "title",
        "subtitle",
        "summary",
        "severity",
        "remediation",
        "mitre_attack",
        "kill_chain",
        "recommended_action",
        "confidence",
        "tags",
        "exploitation.prerequisites"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2026-102489",
      "retrieved_at": "2026-11-05T08:06:18.021Z",
      "confidence": "high",
      "extractor": "claude-code"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-102489",
      "label": "NVD record"
    },
    {
      "type": "cisa",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "label": "CISA Known Exploited Vulnerabilities catalog"
    },
    {
      "type": "vendor_advisory",
      "url": "https://community.zammad.org/t/take-care-local-privilege-escalation-cve-2026-102490-is-reported-as-being-actively-exploited/21297/2"
    },
    {
      "type": "vendor_advisory",
      "url": "https://zammad.com/en/advisories/cve-2026-102489-cve-2026-102490"
    },
    {
      "type": "writeup",
      "url": "https://csirt.divd.nl/CVE-2026-102489"
    }
  ],
  "published_at": "2026-09-30T17:16:40.550Z",
  "issued_at": "2026-11-05T08:06:18.021Z",
  "tags": [
    "zammad",
    "session-fixation"
  ]
}