CVE-2026-34721 Zammad has Cross-site request forgery (CSRF) in OAuth callback endpoints

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the OAuth callback endpoints for Microsoft, Google, and Facebook external credentials do not validate a CSRF state parameter. This vulnerability is fixed in 7.0.1 and 6.5.4...

EUVD-2026-20561

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the OAuth callback endpoints for Microsoft, Google, and Facebook external credentials do not validate a CSRF state parameter. This vulnerability is fixed in 7.0.1 and 6.5.4...

CVE-2026-34720

CVE-2026-34720 affects the Zammad web-based helpdesk system. Prior to versions 7.0.1 and 6.5.4, the SSO mechanism did not verify that the header originated from a trusted SSO proxy/gateway before applying subsequent actions, representing an origin-validation weakness. The issue is fixed in 7.0.1 ...

CVE-2026-34720 Zammad has an origin validation error in SSO mechanism

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the SSO mechanism in Zammad was not verifying the header originates from a trusted SSO proxy/gateway before applying further actions on it. This vulnerability is fixed in 7.0.1 and 6.5.4...

CVE-2026-34720 Zammad has an origin validation error in SSO mechanism

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the SSO mechanism in Zammad was not verifying the header originates from a trusted SSO proxy/gateway before applying further actions on it. This vulnerability is fixed in 7.0.1 and 6.5.4...

EUVD-2026-20560

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the SSO mechanism in Zammad was not verifying the header originates from a trusted SSO proxy/gateway before applying further actions on it. This vulnerability is fixed in 7.0.1 and 6.5.4...

CVE-2026-34720 Zammad has an origin validation error in SSO mechanism

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the SSO mechanism in Zammad was not verifying the header originates from a trusted SSO proxy/gateway before applying further actions on it. This vulnerability is fixed in 7.0.1 and 6.5.4...

CVE-2026-34719 Zammad has a Server-side request forgery (SSRF) via webhooks

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...

CVE-2026-34719 Zammad has a Server-side request forgery (SSRF) via webhooks

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...

CVE-2026-34719 Zammad has a Server-side request forgery (SSRF) via webhooks

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...

CVE-2026-34719

CVE-2026-34719 affects Zammad. The vulnerability is a server-side request forgery (SSRF) in the webhook model. Before 7.0.1 and 6.5.4, the webhook validation only checked the URL scheme and hostname, missing proper validation for loopback and link-local addresses, enabling potential access to con...

CVE-2026-34718

CVE-2026-34718 affects Zammad, a web-based open source helpdesk system. The vulnerability stems from improper sanitization in the HTML sanitizer for ticket articles, which failed to neutralize certain data URI schemes, allowing malicious content to be stored in the database. The issue is mitigate...

CVE-2026-34718 Zammad improperly neutralizes of script-related HTML tags in ticket articles

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the HTML sanitizer for ticket articles was missing proper sanitization of data: ... URI schemes, resulting in storing such malicious content in the database of the Zammad instance. The Zammad GUI is...

EUVD-2026-20558

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the HTML sanitizer for ticket articles was missing proper sanitization of data: ... URI schemes, resulting in storing such malicious content in the database of the Zammad instance. The Zammad GUI is...

CVE-2026-34718 Zammad improperly neutralizes of script-related HTML tags in ticket articles

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, the HTML sanitizer for ticket articles was missing proper sanitization of data: ... URI schemes, resulting in storing such malicious content in the database of the Zammad instance. The Zammad GUI is...

CVE-2026-34248 Zammad has an information disclosure in ticket detail view of customers in shared organizations

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1, customers in shared organizations means they can see each other's tickets could see fields which are not intended for customers - including fields not intended for them at all e.g. priority, custom ticket attribut...

EUVD-2026-20556

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1, customers in shared organizations means they can see each other's tickets could see fields which are not intended for customers - including fields not intended for them at all e.g. priority, custom ticket attribut...

CVE-2026-34248 Zammad has an information disclosure in ticket detail view of customers in shared organizations

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1, customers in shared organizations means they can see each other's tickets could see fields which are not intended for customers - including fields not intended for them at all e.g. priority, custom ticket attribut...

CVE-2026-34248

Zammad (web-based helpdesk) prior to 7.0.1 allowed customers in a shared organization to view fields not intended for customers (e.g., priority, internal ticket attributes) in the ticket detail view when opening a ticket from another user in the same shared org. The root cause is exposure of inte...

CVE-2026-34248 Zammad has an information disclosure in ticket detail view of customers in shared organizations

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1, customers in shared organizations means they can see each other's tickets could see fields which are not intended for customers - including fields not intended for them at all e.g. priority, custom ticket attribut...