Undisclosed RCE in Zammad v6.3 and higher
Summary
| CVE | CVE-2026-102489 |
|---|---|
| State | PUBLISHED |
| Assigner | DIVD |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-30 17:16:40 UTC |
| Updated | 2026-09-30 19:57:08 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 9.4 CRITICAL from [email protected]
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
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 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/C... |
| 4.0 | CNA | CVSS | 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/A... |
| 4.0 | CNA | CVSS | 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/A... |
CVSS v4.0 Breakdown
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
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Zammad GmbH | Zammad | unknown * 6.3.0 semver | Linux, Docker |
| CNA | Zammad GmbH | Zammad | affected 6.3.0 6.5.4 semver | Linux, Docker |
| CNA | Zammad GmbH | Zammad | unaffected 7.0.0 * semver | Linux, Docker |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| csirt.divd.nl/DIVD-2026-00015 | [email protected] | csirt.divd.nl | |
| csirt.divd.nl/CVE-2026-102489 | [email protected] | csirt.divd.nl | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Earth Grob (Merlon Security) (en)
CNA: Luke paris (Merlon Security) (en)
CNA: Tijmen van der Spijk (Merlon Security) (en)
CNA: Zohar Cochavi (Merlon Security) (en)
CNA: Alje Woltjer (Merlon Security) (en)
CNA: Mischa Rick van Geelen (DIVD) (en)
CNA: Ralph Horn (DIVD) (en)
CNA: Max van der Horst (DIVD) (en)
CNA: Victor Pasman (DIVD) (en)
CNA: Frank Breedijk (DIVD) (en)