Communication and Collaboration

In Mattermost versions 10.11.18 and earlier, 11.6.3 and earlier, and 11.5.6 and earlier a low severity vulnerability CVE-2026-3472 was detected. This vulnerability allows an authenticated attacker to exfiltrate data. To address this issue, users should upgrade Mattermost to version 10.11.19 or later. For more details, visit https://nvd.nist.gov/vuln/detail/CVE-2026-3472.

In Mattermost Agents component for Mattermost versions 10.11.18, 11.6.3, 11.5.6 and earlier a medium severity vulnerability CVE-2026-4339 was detected. This vulnerability allows an attacker to perform server-side request forgery (SSRF) and exfiltrate data from internal network services. To address this issue, users should upgrade Mattermost to version 10.11.19 or later. For more details, visit https://nvd.nist.gov/vuln/detail/CVE-2026-4339.

In ArchiveBox versions up to and including 0.6.2 a medium severity vulnerability CVE-2023-45815 was detected. This vulnerability allows an attacker to execute malicious JavaScript in the context of a user’s session, leading to Stored Cross-Site Scripting (XSS) and potential account takeover. This occurs because ArchiveBox serves archived content from the same host and port as its admin panel, which bypasses standard browser CORS and CSRF protections. If a user utilizes the wget extractor to archive a maliciously crafted page and subsequently views the output, the embedded JavaScript executes. For authenticated administrators, this allows the script to silently perform admin actions, such as adding, modifying, or removing snapshots and users. For unauthenticated users, the script can still read all other archived content. To address this issue, users should upgrade ArchiveBox to version 0.9.0 or later. As a temporary mitigation, administrators can disable the wget extractor by setting SAVE_WGET=False, ensure they are logged out before viewing archives, or serve a static HTML version of the archive. For more details, visit https://nvd.nist.gov/vuln/detail/CVE-2023-45815.

In Discourse versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1 a medium severity vulnerability CVE-2026-44779 was detected. This vulnerability allows unauthorized access to sensitive information. This occurs because the bot debug endpoints inadvertently disclose whisper translation audit logs. To address this issue, users should upgrade Discourse to versions 2026.1.4, 2026.3.1, 2026.4.1, or 2026.5.0-latest.1. For more details, visit https://nvd.nist.gov/vuln/detail/CVE-2026-44779.

In Rocket.Chat versions prior to 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, 7.13.9, and 7.10.13 a high severity vulnerability CVE-2026-48929 was detected. This vulnerability allows an unauthenticated attacker to permanently delete any uploaded file by its ID. This occurs because calling the deleteFileMessage Meteor method via an unauthenticated DDP WebSocket connection causes Meteor.userId() to return null, which improperly skips the authorization check. The execution then falls through to unconditionally remove the file from storage and the database using FileUpload.getStore('Uploads').deleteById(fileID). Because file IDs are easily discoverable via public channel message payloads and download URLs, an attacker can target and destroy specific files. To address this issue, users should upgrade Rocket.Chat to versions 8.5.1, 8.4.4, 8.3.6, 8.2.6, 8.1.6, 8.0.7, 7.13.9, or 7.10.13. For more details, visit https://nvd.nist.gov/vuln/detail/CVE-2026-48929.

In Discourse versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1 a high severity vulnerability CVE-2026-44786 was detected. This vulnerability allows an unauthorized user, specifically a MessageBus subscriber who does not have chat enabled, to receive real-time chat message payloads, leading to information disclosure. This occurs because chat events for public category channels are published to the MessageBus without proper permission scoping. To address this issue, users should upgrade Discourse to versions 2026.1.4, 2026.3.1, 2026.4.1, or 2026.5.0-latest.1. For more details, visit https://nvd.nist.gov/vuln/detail/CVE-2026-44786.

In Discourse versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1 a medium severity vulnerability CVE-2026-45085 was detected. This vulnerability encompasses four distinct misauthorization and information disclosure issues within the chat plugin, with one also involving the discourse-calendar plugin. The flaws allow read-only category users to create chat threads and permit authors to restore self-deleted messages even after their channel access has been revoked. Furthermore, it causes information disclosure by exposing a channel’s last_message (which can include unrelated direct message content) to moderators reviewing flagged messages, and by leaking chat channel details via calendar event payloads to unauthorized viewers, including anonymous users. To address this issue, users should upgrade Discourse to versions 2026.1.4, 2026.3.1, 2026.4.1, or 2026.5.0-latest.1. For more details, visit https://nvd.nist.gov/vuln/detail/CVE-2026-45085.

In Discourse versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1 a medium severity vulnerability CVE-2026-47264 was detected. This vulnerability allows an unprivileged or anonymous user to view the names of restricted tag groups, leading to information disclosure. This occurs because the DetailedTagSerializer#tag_group_names function returns every tag group a tag belongs to without properly filtering against the requesting user’s visibility permissions. When the SiteSetting.tags_listed_by_group setting is enabled, hitting the TagsController#info endpoint (which is exempt from login requirements) exposes the names of tag groups that should be restricted to specific user groups or non-visible categories. To address this issue, users should upgrade Discourse to versions 2026.1.4, 2026.3.1, 2026.4.1, or 2026.5.0-latest.1. For more details, visit https://nvd.nist.gov/vuln/detail/CVE-2026-47264.

In Discourse versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1 a medium severity vulnerability CVE-2026-47263 was detected. This vulnerability allows an authenticated user (or an anonymous user if login_required is disabled) to access sensitive webhook payloads, leading to information disclosure. This occurs because the MessageBus.publish call for the /web_hook_events/<id> endpoint within Jobs::RedeliverWebHookEvents fails to pass the group_ids parameter. As a result, the communication channel remains readable by unintended users. Since webhook IDs are sequential integers, an attacker can easily enumerate them to access arbitrary event redelivery payloads. To address this issue, users should upgrade Discourse to versions 2026.1.4, 2026.3.1, 2026.4.1, or 2026.5.0-latest.1. For more details, visit https://nvd.nist.gov/vuln/detail/CVE-2026-47263.