CVE-2026-4273 Insufficient token rotation validation in remote cluster invite confirmation

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13 fail to validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation which allows an authenticated attacker to bypass token rotation and reuse the original invite token via sending a craft...

CVE-2026-4273

Mattermost contains an insufficient validation flaw in remote cluster invite confirmation. Versions affected: 11.5.x ≤ 11.5.1 and 10.11.x ≤ 10.11.13. The RefreshedToken is not properly checked against the original invite token, allowing an authenticated attacker to bypass token rotation and reuse...

CVE-2026-4273 Insufficient token rotation validation in remote cluster invite confirmation

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13 fail to validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation which allows an authenticated attacker to bypass token rotation and reuse the original invite token via sending a craft...

CVE-2026-4273

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13 fail to validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation which allows an authenticated attacker to bypass token rotation and reuse the original invite token via sending a craft...

EUVD-2026-30740

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13 fail to validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation which allows an authenticated attacker to bypass token rotation and reuse the original invite token via sending a craft...

CVE-2026-4273 Insufficient token rotation validation in remote cluster invite confirmation

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13 fail to validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation which allows an authenticated attacker to bypass token rotation and reuse the original invite token via sending a craft...

CVE-2026-28759 Insufficient authorization in shared channel membership sync allows remote cluster to remove users from arbitrary channels

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13, 11.4.x = 11.4.3 fail to validate that a remote cluster has access to a channel before processing membership removal requests during shared channel membership sync, which allows a malicious remote cluster to remove any user from any channel,...

CVE-2026-28759

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13, 11.4.x = 11.4.3 fail to validate that a remote cluster has access to a channel before processing membership removal requests during shared channel membership sync, which allows a malicious remote cluster to remove any user from any channel,...

CVE-2026-28759 Insufficient authorization in shared channel membership sync allows remote cluster to remove users from arbitrary channels

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13, 11.4.x = 11.4.3 fail to validate that a remote cluster has access to a channel before processing membership removal requests during shared channel membership sync, which allows a malicious remote cluster to remove any user from any channel,...

CVE-2026-28759 Insufficient authorization in shared channel membership sync allows remote cluster to remove users from arbitrary channels

Mattermost versions 11.5.x = 11.5.1, 10.11.x = 10.11.13, 11.4.x = 11.4.3 fail to validate that a remote cluster has access to a channel before processing membership removal requests during shared channel membership sync, which allows a malicious remote cluster to remove any user from any channel,...

PT-2026-41643

Name of the Vulnerable Software and Affected Versions Mattermost versions 11.5.0 through 11.5.1 Mattermost versions 10.11.0 through 10.11.13 Description Insufficient token rotation validation occurs during remote cluster invite confirmation. An authenticated attacker can bypass token rotation and...

PT-2026-41640

Name of the Vulnerable Software and Affected Versions Mattermost versions 11.5.0 through 11.5.1 Mattermost versions 10.11.0 through 10.11.13 Mattermost versions 11.4.0 through 11.4.3 Description An issue exists during shared channel membership sync where the system fails to validate if a remote...

[SECURITY] [DSA 6279-1] redis security update

------------------------------------------------------------------------- Debian Security Advisory DSA-6279-1 [email protected] https://www.debian.org/security/ Aron Xu May 17, 2026 https://www.debian.org/security/faq - -------------------------------------------------------------------------...

Debian dsa-6279 : redis - security update

The remote Debian 12 / 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6279 advisory. - ------------------------------------------------------------------------- Debian Security Advisory DSA-6279-1 [email protected]...

Denial Of Service (DoS)

volcano.sh/volcano is vulnerable to Denial of Service DoS. The vulnerability is due to the webhook server not enforcing a size limit on incoming HTTP request bodies, which allows an attacker with access to the in-cluster webhook endpoint to send arbitrarily large requests and cause the webhook...

Sensitive Information Exposure

Harvester is vulnerable to Sensitive Information Exposure. The vulnerability is due to the interactive installer exposing the operating system’s default SSH login password during cluster creation or host addition, potentially allowing unauthorized access to affected systems...

Server-Side Request Forgery (SSRF)

github.com/kyverno/kyvern is vulnerable to Server-Side Request Forgery SSRF. The vulnerability is due to the apiCall feature in ClusterPolicy automatically attaching the admission controller's ServiceAccount token to outbound HTTP requests without validating the destination URL, which allows an...

CLSA-2026-1778858907 mod_proxy_cluster: Fix of 2 CVEs

CVE-2023-6710: stored XSS in modcluster-manager HTML output via virtual host and context names rendered without HTML escaping - CVE-2024-10306: unauthorized MCMP requests due to directive being ignored for protocol-handler filtering; runtime guard now refuses siblings of EnableMCPMReceive, and...

CVE-2026-44015

Nginx UI is a web user interface for the Nginx web server. In 2.3.4 and earlier, an authenticated user can perform Server-Side Request Forgery SSRF by creating a cluster node pointing to an arbitrary internal URL and then sending API requests with the X-Node-ID header. The Proxy middleware forwar...

Important: Red Hat Security Advisory: Red Hat Advanced Cluster Management for Kubernetes v2.13.7 security update

Red Hat Advanced Cluster Management for Kubernetes 2.13 General Availability release images, which add new features and enhancements, bug fixes, and updated container images. Red Hat Advanced Cluster Management for Kubernetes 2.13 images Red Hat Advanced Cluster Management for Kubernetes provides...