CVE-2026-19621

Mattermost versions 11.10.x = 11.10.0, 11.7.x = 11.7.9, 11.9.x = 11.9.1, 11.8.x = 11.8.5 fail to strip action integration secrets from post payloads before broadcasting post-deletion web socket events and returning thread API responses, which allows an authenticated channel member to obtain...

CVE-2026-19621

Mattermost versions 11.10.x = 11.10.0, 11.7.x = 11.7.9, 11.9.x = 11.9.1, 11.8.x = 11.8.5 fail to strip action integration secrets from post payloads before broadcasting post-deletion web socket events and returning thread API responses, which allows an authenticated channel member to obtain...

CVE-2026-19621 Mattermost leaks interactive-message integration secrets to non-admin users via post-deletion events and thread reads

Mattermost versions 11.10.x = 11.10.0, 11.7.x = 11.7.9, 11.9.x = 11.9.1, 11.8.x = 11.8.5 fail to strip action integration secrets from post payloads before broadcasting post-deletion web socket events and returning thread API responses, which allows an authenticated channel member to obtain...

CVE-2026-19621

Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, and 11.8.x

CVE-2026-19621: Exposure of Sensitive Information to an Unauthorized Actor

Mattermost versions 11.10.x = 11.10.0, 11.7.x = 11.7.9, 11.9.x = 11.9.1, 11.8.x = 11.8.5 fail to strip action integration secrets from post payloads before broadcasting post-deletion web socket events and returning thread API responses, which allows an authenticated channel member to obtain...

PT-2026-82035

Mattermost doesn't restrict role updated websocket event broadcasts to members of the affected team or channel in github.com/mattermost/mattermost-server...

CVE-2026-16544

AWX security issue: the websocket event consumer omits RBAC checks for inventory_update_events, project_update_events, and system_job_events, allowing any authenticated user to subscribe to these unmapped groups and view real-time stdout from jobs in other organizations. Affected component is the...

CVE-2026-16544

A flaw was found in AWX. The websocket event consumer performs RBAC authorization checks only for event groups that are mapped in the consumeraccess function jobevents, workflowevents, adhoccommandevents. Three event groups - inventoryupdateevents, projectupdateevents, and systemjobevents — are n...

Information Exposure

Overview github.com/mattermost/mattermost/server/channels/app is a private-cloud Slack alternative Affected versions of this package are vulnerable to Information Exposure via the roleupdated websocket event broadcast process. An attacker can gain unauthorized access to permission scheme change...

CVE-2026-48592

Missing Authorization vulnerability in oban-bg obanweb 'Elixir.Oban.Web.Jobs.DetailComponent' modules allows unauthorized job worker substitution. The handleevent"save-job", ... handler in 'Elixir.Oban.Web.Jobs.DetailComponent' does not perform an authorization check, unlike the sibling cancel,...

CVE-2026-2578 Information Disclosure via WebSocket Event When Deleting Unrevealed Burn on Read Posts

Mattermost versions 11.3.x = 11.3.0 fail to preserve the redacted state of burn-on-read posts during deletion which allows channel members to access unrevealed burn-on-read message contents via the WebSocket post deletion event.. Mattermost Advisory ID: MMSA-2026-00579...

CVE-2026-2578

Mattermost (version 11.3.x, affected range up to 11.3.0) has a vulnerability where the redacted state of burn-on-read posts is not preserved during deletion. This allows channel members to access unrevealed burn-on-read message contents via the WebSocket post deletion event. CVSS v3.1 base score ...

CVE-2026-2578 Information Disclosure via WebSocket Event When Deleting Unrevealed Burn on Read Posts

Mattermost versions 11.3.x = 11.3.0 fail to preserve the redacted state of burn-on-read posts during deletion which allows channel members to access unrevealed burn-on-read message contents via the WebSocket post deletion event.. Mattermost Advisory ID: MMSA-2026-00579...

EUVD-2019-11384

Malware in sbrugna...

EUVD-2023-33787

Malicious code in bioql PyPI...

CVE-2020-14457

An issue was discovered in Mattermost Server before 5.20.0. Non-members can receive broadcasted team details via the updateteam WebSocket event, aka MMSA-2020-0012...

BIT-MATTERMOST-2020-14457

An issue was discovered in Mattermost Server before 5.20.0. Non-members can receive broadcasted team details via the updateteam WebSocket event, aka MMSA-2020-0012...

BIT-MATTERMOST-2023-2281

When archiving a team, Mattermost fails to sanitize the related Websocket event sent to currently connected clients. This allows the clients to see the name, display name, description, and other data about the archived team...

Information Disclosure

github.com/mattermost/mattermost-server is vulnerable to Information Disclosure. The vulnerability exists because the library fails to sanitize the related WebSocket event sent to currently connected clients, which allows an attacker to see the name, display name, description, and other data when...

CVE-2023-2281

When archiving a team, Mattermost fails to sanitize the related Websocket event sent to currently connected clients. This allows the clients to see the name, display name, description, and other data about the archived team...