Vulnerability details
CVE-2026-34719
zammad zammad
Zammad has a Server-side request forgery (SSRF) via webhooks
CVSS 4.0
8.3High
Official description
Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the webhook model was missing a proper validation for loop back addresses, or link-local addresses — only the URL scheme (HTTP/HTTPS) as well as the hostname was checked. This could end up in retrieving confidential metadata of cloud/hosting providers. The existing check is now extended and is applied when configuring webhooks as well as triggering webhook jobs. This vulnerability is fixed in 7.0.1 and 6.5.4.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.3High | 4.0 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:H/SC:L/SI:N/SA:H |
| 4.3Medium | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| zammad | zammad | < 6.5.4 | CVEProject cvelistV5 (CNA) |
| zammad | zammad | >= 7.0.0-alpha, < 7.0.1 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://github.com/zammad/zammad/security/advisories/GHSA-2vgc-vfh2-rw75 x_refsource_CONFIRM
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Details
- Published
- 2026-04-08
- Last updated
- 2026-04-11
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.25%
Probability of exploitation in 30 days
16.9%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-918Server-Side Request Forgery (SSRF)