CVE-2026-102489
HighExploitedPublic exploitUndisclosed RCE in Zammad v6.3 and higher
Published Sep 30, 2026 · Updated Oct 10, 2026 · Also known as EUVD-2026-90080, GHSA-xmw5-m2wg-4243
Key Facts
Patch immediately- CVE-2026-102489 is a high-severity vulnerability (CVSS 8.7 v4) affecting Zammad.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 30, 2026. Public exploit code is available.
- EPSS estimates a 1.3% probability of exploitation in the next 30 days.
- Fixed versions are available, including Zammad 6.5.4.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v4
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
EPSS (30-day exploit likelihood)
1.3%
Higher than 69.0% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-102489 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Oct 2, 2026 | Oct 5, 2026 | Not reported |
| Industry KEV feed | Sep 30, 2026 | Oct 5, 2026 | Not reported |
| CIRCL KEV | Sep 30, 2026 | Oct 5, 2026 | Not reported |
| ENISA EUVD | Sep 30, 2026 | n/a | Not reported |
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.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| ZammadZammad | >= 6.3.0 | 6.5.4 |
Patched Releases
Zammad
6.5.4
Timeline
Publicly disclosed
Sep 30, 2026
Added to Industry KEV feed
Sep 30, 2026
Added to CIRCL KEV
Sep 30, 2026
Added to ENISA EUVD
Sep 30, 2026
Added to CISA KEV
Oct 2, 2026
Last updated
Oct 10, 2026
Weakness Type
- CWE-384 Session Fixation
References
- advisoryhttps://csirt.divd.nl/CVE-2026-102489
- advisoryhttps://csirt.divd.nl/DIVD-2026-00015
- advisoryhttps://zammad.com/en/advisories/cve-2026-102489-cve-2026-102490
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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.
Affected: Zammad versions >= 6.3.0. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 30, 2026.
Yes. It was added on Oct 2, 2026 with a federal remediation due date of Oct 5, 2026.
Public exploit code is available.
Fixed versions are available, including Zammad 6.5.4.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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