{"id":"CVE-2026-102489","published":"2026-09-30T17:16:40Z","modified":"2026-10-10T04:18:08Z","title":"Zammad GmbH Zammad Session Fixation Vulnerability","vendor":"Zammad GmbH","product":"Zammad","tier":"core","eol":null,"description":{"text":"Zammad versions 6.3.0 to 6.5.4 are vulnerable a session hijack vulnerability that leads to remote code execution as the zammad user. The bug is also present in version 7.0.0 to version 7.1.2, but not exploitable due to changes in the underlying framework.","provenance":"source","from":"NVD"},"summary":{"text":"Zammad, the open-source help desk and ticketing product from Zammad GmbH, contains a session fixation flaw that affects versions 6.3.0 through 6.5.4, and the same bug is present in 7.0.0 through 7.1.2 though not exploitable there. An attacker with network access and no authentication or user interaction required can hijack a session, leading to remote code execution as the zammad user.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:14:33Z"},"cvss":{"score":9.8,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.22478,"percentile":0.97706,"date":"2026-10-31","provenance":"source"},"kev":{"dateAdded":"2026-10-02","dueDate":"2026-10-05","ransomware":false,"requiredAction":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","notes":"https://zammad.com/en/product/releases/ ; https://community.zammad.org/t/take-care-local-privilege-escalation-cve-2026-102490-is-reported-as-being-actively-exploited/21297/2 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-102489","provenance":"source"},"vulncheckKev":{"dateAdded":"2026-09-30","exploitedFirstSeen":"2026-09-30","ransomware":false,"evidence":[{"url":"https://csirt.divd.nl/cases/DIVD-2026-00015/","date":"2026-09-30"},{"url":"https://euvd.enisa.europa.eu/enisa/EUVD-2026-90080","date":"2026-09-30"},{"url":"https://www.linkedin.com/posts/zammad-share-7511092586393010176-RkCb/","date":"2026-09-30"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2026-10-02"}],"evidenceTotal":4,"provenance":"source"},"exploited":true,"otx":null,"cwes":[{"id":"CWE-384","name":"Session Fixation"}],"references":[{"url":"https://community.zammad.org/t/take-care-local-privilege-escalation-cve-2026-102490-is-reported-as-being-actively-exploited/21297/2","tags":["Vendor Advisory"]},{"url":"https://csirt.divd.nl/CVE-2026-102489","tags":["Third Party Advisory"]},{"url":"https://csirt.divd.nl/DIVD-2026-00015","tags":["Third Party Advisory"]},{"url":"https://zammad.com/en/advisories/cve-2026-102489-cve-2026-102490","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-102489","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: remote exploitation of public-facing web application","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"vulnerable a session hijack vulnerability","start":35,"end":76}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: yields code execution as zammad user","mappingType":"primary_impact","evidence":[{"from":"description","quote":"leads to remote code execution as the zammad user","start":82,"end":131}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-90080","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-90080","exploited":true,"exploitedSince":"2026-09-30","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":2,"skipped":1,"earliest":"2026-10-06","earliestUrl":"https://github.com/horizon3ai/CVE-2026-102489","repos":[{"name":"horizon3ai/CVE-2026-102489","url":"https://github.com/horizon3ai/CVE-2026-102489","stars":6,"created":"2026-10-06"},{"name":"1xPwn/CVE-2026-102489","url":"https://github.com/1xPwn/CVE-2026-102489","stars":6,"created":"2026-10-11"}]},"first":{"date":"2026-10-06","source":"PoC-in-GitHub","url":"https://github.com/horizon3ai/CVE-2026-102489"},"provenance":"source"},"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"ai"},{"stage":"primary","techniques":["T1059"],"provenance":"ai"}],"timeline":[{"date":"2026-09-30","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102489","provenance":"source"},{"date":"2026-09-30","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://csirt.divd.nl/cases/DIVD-2026-00015/","provenance":"source"},{"date":"2026-09-30","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-90080","provenance":"source"},{"date":"2026-10-02","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2026-10-06","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/horizon3ai/CVE-2026-102489","provenance":"source"}],"speed":{"daysToPublicExploit":6,"firstExploitFrom":"PoC-in-GitHub","daysToKev":2},"priority":{"score":76.4,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":10.0,"detail":"added 32 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.54,"detail":"percentile 0.9771"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"2 PoC-in-GitHub repos"},{"name":"Mentioned in OTX pulses","points":0.0,"detail":"0 pulses"},{"name":"CVSS severity","points":6.86,"detail":"base score 9.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}