CVE-2026-102489

Undisclosed RCE in Zammad v6.3 and higher

At a glance

Severity: HIGH 8.7
Exploitation: Known exploited (CISA KEV) · added 2026-10-02
Exploited per ENISA since 2026-09-30
EPSS: EPSS 1.96 % · percentile 80 (2026-10-27)
State: PUBLISHED
Published: 2026-09-30
Updated: 2026-10-19
Assigner: DIVD
NVD status: Analyzed

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.

Scores

Version	Score	Vector	Scored by
CVSS 4.0	HIGH 8.7	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	DIVD
CVSS 4.0	CRITICAL 9.4	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	DIVD
CVSS 4.0	CRITICAL 9.4	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	NVD · csirt@divd.nl (Secondary)
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	NVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

CWE-384

European references

ENISA EUVD · EUVD-2026-90080
GCVE · GCVE-0-2026-102489

Affected configurations (NVD CPE)

cpe:2.3:a:zammad:zammad:*:*:*:*:*:*:*:* ≥ 6.3.0 ≤ 6.5.4

Affected products

Product	Versions
Zammad GmbH · Zammad	unknown * < 6.3.0 ; affected 6.3.0 < 6.5.4 ; unknown 7.0.0 < 7.1.3

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
CISA Known Exploited Vulnerabilities	CC0 1.0
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD