Critical severity · published Sep 30, 2026
CVE-2026-102489
Undisclosed RCE in Zammad v6.3 and higher
In wildKEV
9.8
CVSS
2%
EPSS
Yes
On KEV
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 bug is also present in version 7.0.0 to version 7.1.2, but not exploitable due to changes in the underlying framework.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.0% · higher than 80% of CVEs
Exploited in the wildYes
CISA KEVListed Oct 2, 2026
Federal remediation dueOct 5, 2026
Ransomware campaign useNot known
Affected products
Which versions
ZA
Zammad · Zammad GmbH
6.3.0 before 6.5.4 · source: vendor, NVD, KEV
In the news
VulnerabilityCritical
U.S. CISA adds Zammad GmbH Zammad flaws to its Known Exploited Vulnerabilities catalog
U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds Zammad GmbH Zammad flaws to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added the following vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog: The first flaw, CVE-2026-102489, is a session hijacking vulnerability in Zammad that can lead to remote code execution as the […]
Oct 2, 2026·Security Affairs
AdvisoryHigh
CISA Adds Two Known Exploited Vulnerabilities to Catalog
CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation.
CVE-2026-102489 Zammad GmbH Zammad Session Fixation Vulnerability
CVE-2026-102490 Zammad GmbH Zammad Improper Privilege Management Vulnerability
These types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose significant risks to the federal enterprise.
Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CISA’s KEV Catalog on publicly exposed assets that grant total control of the asset post-exploitation, while deferring action for lower-risk vulnerabilities. BOD 26-04 further establishes basic expectations for when agencies must check whether threat actors compromised the system before the patch was applied.
While BOD 26-04 applies only to FCEB agencies, CISA encourages all organizations to adopt risk-based vulnerability management and prioritize remediation of KEV Catalog vulnerabilities . CISA will continue to add vulnerabilities to the catalog that meet the specified criteria .
Aware of an exploited...
Oct 2, 2026·CISA Advisories
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-102489
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-102489
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
third-party-advisory
https://csirt.divd.nl/DIVD-2026-00015
third-party-advisory
https://csirt.divd.nl/CVE-2026-102489
vendor-advisory
https://zammad.com/en/advisories/cve-2026-102489-cve-2026-102490
technical-description
https://community.zammad.org/t/take-care-local-privilege-escalation-cve-2026-102490-is-reported-as-being-actively-exploited/21297/2
More from Zammad
7.8
CVE-2026-102490
Local privilege escalation in Zammad v1.5.0 to v7.2.2 installed via DEB or RPM package
