CVE-2026-102489 (GCVE-0-2026-102489)

Vulnerability from cvelistv5 – Published: 2026-09-30 16:21 – Updated: 2026-10-05 10:25
VLAI CISA ENISA Previdian
Title
Undisclosed RCE in Zammad v6.3 and higher
Summary
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 vulnerability is also present in version 7.0.0 to version 7.1.3, but not exploitable due to environment conditions.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:A/AU:Y/V:C
9.4 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/AU:Y/V:C
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 00:00 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Zammad GmbH Zammad Unknown: * , < 6.3.0 (semver)
Affected: 6.3.0 , < 6.5.4 (semver)
Unaffected: 7.0.0 , < * (semver)
guessed Create a notification for this product.
Date Public
2026-09-29 20:00
Credits
Earth Grob (Merlon Security) Luke Paris (Merlon Security) Tijmen van der Spijk (Merlon Security) Zohar Cochavi (Merlon Security) Alje Woltjer (Merlon Security) Mischa Rick van Geelen (DIVD) Ralph Horn (DIVD) Max van der Horst (DIVD) Victor Pasman (DIVD) Frank Breedijk (DIVD)
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 8aa6e8d1-7772-4605-a57e-8602347e2f15

Vulnerability ID: CVE-2026-102489

Status: Confirmed

Status Updated: 2026-10-02 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-10-02
Asserted: 2026-10-02
Scope
Notes: Zammad GmbH Zammad Session Fixation Vulnerability | Affected: Zammad GmbH / Zammad | Description: Zammad GmbH Zammad contains a session fixation vulnerability that can lead to remote code execution as the zammad user. This vulnerability can be chained with CVE-2026-102490. | Required action: 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. | Due date: 2026-10-05 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): 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
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-384
Feed CISA Known Exploited Vulnerabilities Catalog
Product Zammad
Due Date 2026-10-05
Date Added 2026-10-02
Vendorproject Zammad GmbH
Vulnerabilityname Zammad GmbH Zammad Session Fixation Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-10-02 16:00 UTC | Updated: 2026-10-02 16:00 UTC
ENISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 8227a228-d30d-4abb-9c78-64ef4ab79579

Vulnerability ID: CVE-2026-102489

Status: Confirmed

Status Updated: 2026-09-30 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-30
Asserted: 2026-09-30
Scope
Notes: Affected: Zammad / Zammad | Description: 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 vulnerability is also present in version 7.0.0 to version 7.1.3, but not exploitable due to environment conditions. | Patched since: 2026/04/08 | Exploitation type: unknown | Origin source: NCSC-NL | Notes: https://www.ncsc.nl/alerts/actief-misbruik-van-zeroday-kwetsbaarheden-in-zammad-update-nu
Evidence

Type: Csirt Report

Signal: Successful Exploitation

Confidence: 75%

Source: enisa-cnw-kev

Details
Cwes
Euvd EUVD-2026-90080
Notes https://www.ncsc.nl/alerts/actief-misbruik-van-zeroday-kwetsbaarheden-in-zammad-update-nu
Catalog ENISA / EU CSIRTs Network (CNW) KEV JSON
Product Zammad
Datereported 2026/09/30
Originsource NCSC-NL
Patchedsince 2026/04/08
Vendorproject Zammad
Exploitationtype unknown
Vulnerabilityname
Threatactorsexploiting
References
Created: 2026-10-01 08:00 UTC | Updated: 2026-10-01 08:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: e84ea692-17b1-47d8-adfb-2c5c590f6965

Vulnerability ID: CVE-2026-102489

Status: Confirmed

Status Updated: 2026-09-30 18:52 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-30
Asserted: 2026-09-30
Scope
Notes: Undisclosed RCE in Zammad v6.3 and higher | Affected: Zammad / Zammad | CVSS: 8.7 (HIGH) | EPSS: 0.00709 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title Undisclosed RCE in Zammad v6.3 and higher
Cve Id CVE-2026-102489
Vendor Zammad
Ghsa Id GHSA-XMW5-M2WG-4243
Product Zammad
Added Date 2026-09-30T18:52:45.188Z
Cvss Score 8.7
Epss Score 0.00709
Previous Ids
Cvss Severity HIGH
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.51763
Used In Malware unknown
Vulnerability Id CVE-2026-102489
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-10-01 19:00 UTC | Updated: 2026-10-01 19:00 UTC
Show details on NVD website
To clipboard 

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              },
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                  },
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              }
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                ]
              }
            ],
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            "title": "CISA ADP Vulnrichment"
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        ],
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              "value": "Luke Paris (Merlon Security)"
            },
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              "lang": "en",
              "type": "finder",
              "value": "Tijmen van der Spijk (Merlon Security)"
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              "type": "finder",
              "value": "Zohar Cochavi (Merlon Security)"
            },
            {
              "lang": "en",
              "type": "finder",
              "value": "Alje Woltjer (Merlon Security)"
            },
            {
              "lang": "en",
              "type": "finder",
              "value": "Mischa Rick van Geelen (DIVD)"
            },
            {
              "lang": "en",
              "type": "finder",
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            "dateUpdated": "2026-10-05T10:25:49.386Z",
            "orgId": "b87402ff-ae37-4194-9dae-31abdbd6f217",
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          "references": [
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              "tags": [
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              "url": "https://csirt.divd.nl/DIVD-2026-00015"
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            "discovery": "INTERNAL"
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          "title": "Undisclosed RCE in Zammad v6.3 and higher",
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        "datePublished": "2026-09-30T16:21:19.937Z",
        "dateReserved": "2026-09-29T09:46:12.490Z",
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  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.