Quick answers
- Is CVE-2026-34718 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-34718 being exploited in the wild.
- How severe is CVE-2026-34718?
- Medium severity, with a CVSS score of 6.1, published 8 April 2026.
- Which products and versions are affected?
- Zammad < 6.5.4, >= 7.0.0-alpha < 7.0.1.
- Is there a fix for CVE-2026-34718?
- A patch was published on 2026-04-08. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-34718 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-34718?
- Check whether you run Zammad at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A Cross-Site Scripting (XSS) vulnerability exists in Zammad due to improper neutralization of script-related HTML tags and URI schemes in ticket articles. The HTML sanitizer failed to properly validate input, allowing malicious payloads to be persisted in the database. When an agent views the affected ticket, the Zammad GUI renders this content. Although the impact was mitigated by existing Content Security Policy (CSP) rules, the flaw allowed for the storage and rendering of unauthorized URI schemes. The issue is resolved in versions 7.0.1 and 6.5.4.
Affected products
- Zammad Zammad < 6.5.4, >= 7.0.0-alpha < 7.0.1
Timeline
- 2026-04-08: disclosed
- 2026-04-08: advisory
- 2026-04-08: patched