03 October 2026
Reference: CVE-2026-102489
1. What is being reported?
The report highlights a critical vulnerability in Zammad versions 6.3.0 to 6.5.4 that allows attackers to take over user sessions and execute commands remotely as the Zammad user. Although the issue exists in versions 7.0.0 to 7.1.3, it cannot currently be exploited due to specific environment conditions.
2. What this means in plain English
If your organisation uses the affected Zammad versions, hackers could potentially gain control over your support software and use it to access or damage your systems. This could lead to data loss, service disruption, or further security breaches.
3. Could this affect a small business?
Small businesses, charities, clubs, or any organisation using the vulnerable Zammad versions could be at risk, especially if the software is accessible over the internet. If you do not use Zammad or use a different version, you are likely not affected.
4. What to do now
- Check if your organisation uses Zammad and identify the version installed.
- If using versions 6.3.0 to 6.5.4, apply the vendor’s security updates or mitigations immediately.
- If using versions 7.0.0 to 7.1.3, confirm with your IT provider that your environment conditions prevent exploitation.
- Review your internet exposure of Zammad and follow CISA’s guidance on prioritising security updates or consider discontinuing use if mitigations are not available.
5. Ask your IT provider
Can you confirm if our Zammad software is affected by CVE-2026-102489 and what steps have been taken to secure or update it?
6. Bottom line
If you use Zammad, act quickly to update or secure it to prevent hackers from exploiting this critical vulnerability.
Information based on CISA KEV, NVD and reputable security reporting.