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 crafted invite confirmation with a RefreshedToken matching the original token. Mattermost Advisory ID: MMSA-2026-00575

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost Mattermost Server

CVE-2026-28732

Slash command trigger-word update allowed command hijacking

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 Fail to enforce slash command trigger-word uniqueness during command updates which allows an authenticated team member with Manage Own Slash Commands permission to hijack and impersonate existing system or custom slash commands via editing their own slash command trigger to an already-registered trigger through the command update API. Mattermost Advisory ID: MMSA-2026-00597

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost Mattermost Server

CVE-2026-45672

Open WebUI: Jupyter code execution works despite `ENABLE_CODE_EXECUTION=false` — feature gate bypassed

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.12, the /api/v1/utils/code/execute endpoint executes arbitrary Python code via Jupyter for any verified user, even when the admin has set ENABLE_CODE_EXECUTION=false. The feature gate is not enforced on the API endpoint — the configuration says "disabled" but code still executes. This vulnerability is fixed in 0.8.12.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed

Vendors

Open-webui Openwebui

Products

Open-webui Open Webui

CVE-2026-44567

Open WebUI: Open WebUI Improper Authorization Control

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.1.124, the API does not properly validate that the user has an authorized user role of user. By default, when Open WebUI is configured with new sign-ups enabled, the default user role is set to pending. In this configuration, an administrator is required to go into the Admin management panel following a new user registration and reconfigure the user to have a role of either user or admin before that user is able to access the web application. This vulnerability is fixed in 0.1.124.

CVSS 3.1 · 7.3 High EPSS < 1% KEV · Not listed

Vendors

Open-webui Openwebui

Products

Open-webui Open Webui

CVE-2026-21789

HCL Connections is vulnerable to broken access control

HCL Connections contains a broken access control vulnerability that may allow unauthorized user to update data in certain scenarios.

CVSS 3.1 · 4.6 Medium EPSS < 1% KEV · Not listed

Vendors

Hcltech

Products

Connections

CVE-2026-44557

Open WebUI: Global Knowledge Base Enumeration via knowledge-bases Meta-Collection

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the _validate_collection_access function uses an incomplete allowlist that only enforces ownership checks for collections matching user-memory-* and file-* patterns. All other collection names pass through unchecked — including the system-level knowledge-bases meta-collection, which stores the IDs, names, and descriptions of every knowledge base on the instance. Any authenticated user can query this meta-collection directly via the retrieval query endpoints to obtain a global index of all knowledge bases across all users. This vulnerability is fixed in 0.9.0.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed

Vendors

Open-webui Openwebui

Products

Open-webui Open Webui

CVE-2026-44564

Open WebUI: Read-Only Users Can Modify Collaborative Documents via Socket.IO

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the ydoc:document:update Socket.IO event handler checks whether the sender is a member of the document's Socket.IO room (line 678) but does not verify that the sender has write permission. Users with read-only access join the document room via ydoc:document:join, which only requires read permission (line 520). Once in the room, the user can emit ydoc:document:update events that modify the in-memory Yjs document state and are broadcast to all other collaborators in real time. This vulnerability is fixed in 0.9.0.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed

Vendors

Open-webui Openwebui

Products

Open-webui Open Webui

CVE-2026-44561

Open WebUI: Deactivated Channel Members Retain Full Access to Group/DM Channels

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the is_user_channel_member function checks whether a ChannelMember row exists but does not check the is_active field. When a user is deactivated from a group or DM channel (removed by the channel owner, or leaves voluntarily), their membership row persists with is_active=False and status='left'. Because the authorization check ignores this field, the deactivated user retains full read and write access to the channel via direct API calls. This vulnerability is fixed in 0.9.0.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed

Vendors

Open-webui Openwebui

Products

Open-webui Open Webui

CVE-2026-45339

Open WebUI: API key endpoint restrictions bypassed via `x-api-key` header — full message processing on restricted endpoints

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, Open WebUI allows admins to restrict which API endpoints an API key can access. When an API key is restricted from /api/v1/messages, requests using the Authorization: Bearer sk-... header are correctly blocked with 403. However, the same key sent via the x-api-key header bypasses the restriction entirely — the request is authenticated, the model is invoked, and a full response is returned. This vulnerability is fixed in 0.9.0.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Open-webui Openwebui

Products

Open-webui Open Webui

CVE-2026-45316

Open WebUI: Read-Only Users Can Toggle Note Pin Status via Incorrect Permission Check (Write via Read-Only Access)

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.3, the POST /api/v1/notes/{id}/pin endpoint performs a write operation (toggling the is_pinned field) but only checks for read permission. Users with read-only access to a shared note can pin/unpin it, which is a state-modifying action that should require write permission. This vulnerability is fixed in 0.9.3.

CVSS 3.1 · 3.5 Low EPSS < 1% KEV · Not listed

Vendors

Open-webui Openwebui

Products

Open-webui Open Webui

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, including private channels, via crafted membership sync messages targeting channels the remote cluster is not authorized to access. Mattermost Advisory ID: MMSA-2026-00576

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost Mattermost Server

CVE-2026-4286

Playbooks Plugin fails to validate team transfers, allowing unauthorized removal of member access via playbook update

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to check if {{team_id}} was being changed when updating playbooks, allowing users with only {{Manage Playbook Configurations}} permission to change a playbook's team, bypassing manage members restriction via PUT api. Mattermost Advisory ID: MMSA-2025-00552

CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost Mattermost Server

CVE-2026-6343

Mattermost Playbooks Plugin fails to enforce view permissions in list endpoints, allowing unauthorized access to public playbooks

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to check public/private permissions which allows members without these permissions to access public playbooks via /get.. Mattermost Advisory ID: MMSA-2026-00591

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed

Vendors

Mattermost

Products

Mattermost Mattermost Server

CVE-2026-41432

New API: Stripe Webhook Signature Bypass via Empty Secret Enables Unlimited Quota Fraud

New API is a large language mode (LLM) gateway and artificial intelligence (AI) asset management system. Prior to version 0.12.10, a vulnerability exists in the Stripe webhook handler that allows an unauthenticated attacker to forge webhook events and credit arbitrary quota to their account without making any payment. This issue has been patched in version 0.12.10.

CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed

Vendors

Newapi Quantumnous

Products

New Api New-api

CVE-2026-42137

Kirby: `pages.access/list` and `files.access/list` permissions are not consistently checked in the REST API and changes dialog

Kirby is an open-source content management system. Prior to versions 4.9.0 and 5.4.0, `pages.access/list` and `files.access/list` permissions are not consistently checked in the Panel and REST API. This issue has been patched in versions 4.9.0 and 5.4.0.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed

Vendors

Getkirby

Products

Kirby

CVE-2025-15023

Improper Access Control in Yordam Informatics' Library Automation System

Incorrect Authorization vulnerability in Yordam Information Technology Consulting, Training and Electronic Systems Industry and Trade Inc. Library Automation System allows Exploiting Incorrectly Configured Access Control Security Levels. This issue affects Library Automation System: from v.19.5 before v.22.1.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed

Vendors

Yordam

Products

Library Automation System

CVE-2026-45148

SiYuan: Broken access control in SiYuan publish-mode Readers can enumerate metadata

SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, broken access control in the searchAsset, searchTag, searchWidget, and searchTemplate publish-mode Readers can enumerate metadata from documents that are invisible to the publish service. This vulnerability is fixed in 3.7.0.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed

Vendors

Siyuan

Products

Siyuan

CVE-2026-44283

etcd: Read access via PrevKv in etcd transactions may bypass RBAC authorization checks

etcd is a distributed key-value store for the data of a distributed system. Prior to 3.4.44, 3.5.30, and 3.6.11, a vulnerability in etcd allows read access via PrevKv, or lease attachment in Put requests within transaction operations, to bypass RBAC authorization checks. An authenticated user without sufficient read or lease-related permissions may be able to access unauthorized data or attach leases by invoking transaction operations with these features enabled. This vulnerability is fixed in 3.4.44, 3.5.30, and 3.6.11.

CVSS 3.1 · 0 Low EPSS < 1% KEV · Not listed

Vendors

Etcd

Products

Etcd

CVE-2026-42296

Argo Workflows has incomplete fix for CVE-2026-31892: hostNetwork, securityContext, serviceAccountName bypass templateReferencing Strict/Secure

Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. Prior to versions 3.7.14 and 4.0.5, a user with create Workflow permission can bypass templateReferencing: Strict to get host network access, switch service accounts, override pod security context, add tolerations to schedule on control-plane nodes, or enable SA token mounting. This defeats the stated purpose of the feature. The practical impact depends on what Kubernetes-level controls are in place. Clusters with PodSecurity admission or OPA/Gatekeeper would independently block some of these (like hostNetwork). Clusters that rely on Argo's Strict mode as the primary enforcement layer are fully exposed. This issue has been patched in versions 3.7.14 and 4.0.5.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed

Vendors

Argoproj

Products

Argo-workflows Argo Workflows

CVE-2026-41888

Distribution: Tag deletion bypasses `storage.delete.enabled` configuration

Distribution is a toolkit to pack, ship, store, and deliver container content. Prior to 3.1.1, tag deletion via the DELETE /v2/<name>/manifests/<tag> endpoint bypasses the storage.delete.enabled: false configuration, allowing any API client to remove tags from repositories even when the operator has explicitly disabled deletion. This vulnerability is fixed in 3.1.1.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed

Vendors

Distribution

Products

Distribution