◆ CVE Hub

CVE-2026-102489

KEV: known exploited SSVC: active

Undisclosed RCE in Zammad v6.3 and higher

Published
2026-09-30
Last modified
2026-10-19
CNA
DIVD
NVD status
Analyzed
CWE
CWE-384

Fetching some sources has been requested. Reload in about a minute to see them.

CVSS v3.1 (listed by NVD)
9.8
CRITICAL
Scored by NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0 (listed by NVD)
9.4
CRITICAL
Scored by divd.nl (not yet scored by NVD)
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:C/RE:X/U:X
CVSS (listed by CVE.org)
8.7
HIGH
Scored by CNA (DIVD) · v4.0
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
EPSS exploit probability
1.3%
Percentile 69.3%
as of 2026-10-24
CISA KEV
Listed
Added 2026-10-02 / due 2026-10-05
Ransomware use: Unknown
SSVC (CISA ADP)
active
Automatable: no / Impact: total

Attack conditions and impact

Derived from the NVD CVSS 3.1 vector
NetworkNo authNo interaction Exploited Confidentiality HIntegrity HAvailability H

This vulnerability may be exploitable over the internet without authentication or user interaction.

MetricValueMeaning
Attack vector AVNNetwork
Attack complexity ACLLow (easy)
Privileges required PRNNone
User interaction UINNone
Scope SUUnchanged
Confidentiality CHHigh
Integrity IHHigh
Availability AHHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

NVD

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.

CISA KEV entry

Zammad GmbH Zammad Session Fixation Vulnerability — Zammad GmbH / Zammad

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.

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

CVSS assessments

ProviderVersionScoreVector
NVD / [email protected] (Secondary)4.09.4 CRITICALCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:C/RE:X/U:X
NVD / [email protected] (Primary)3.19.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA / DIVD4.08.7 HIGHCVSS: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
CNA / DIVD4.09.4 CRITICALCVSS: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

Affected products and packages

CNA (CVE.org)

VendorProductVersions
Zammad GmbHZammad
unknown: * … < 6.3.0
affected: 6.3.0 … < 6.5.4
unknown: 7.0.0 … < 7.1.3
default: unaffected

NVD CPE (1)

Show CPE list
VendorProductRangeCPE
zammadzammad>= 6.3.0, <= 6.5.4cpe:2.3:a:zammad:zammad:*:*:*:*:*:*:*:*

Linux distribution status

Red Hat ↗ Fetching

Debian ↗

No record

Ubuntu ↗ Fetching

References (5)