Mattermost 7.9
Mattermost 7.9
The Mattermost 7.9 reached end of service life on Jul 15, 2023 — Mattermost no longer ships security patches or fixes for it. Our third-party support keeps it safe to run: 24/7 engineers manage issues, remediate vulnerabilities, and help you maintain compliance.
24/7 engineers own your Mattermost 7.9 incidents end to end.
Mitigation and patch-around guidance when the vendor no longer ships fixes.
Controls evidence and documentation that keep auditors satisfied.
Specifications
- product
- mattermost
- release
- 7.9
- product Label
- Mattermost
- release Label
- 7.9
- codename
- lts
- latest Version
- 7.9.6
- release Date
- 2023-03-14
- maintained
- source Url
- https://endoflife.date/mattermost
Lifecycle Dates
- End of Service Life
- Jul 15, 2023
- Last OEM Support
- Jul 15, 2023
OEM vs. 3rd Party Support
See how third-party support compares to the vendor contract for Mattermost 7.9 — monitoring, break/fix, vulnerability work, operations and compliance, before and after EOSL.
| Feature | OEM Support | 3rd Party Support |
|---|---|---|
| Post-EOSL Support | ||
| Break/Fix Support | Until EOSL | |
| 24/7 Monitoring | ||
| Vulnerability Scanning & Remediation | ||
| Managed Operations | ||
| Procedure & Configuration Review | ||
| Compliance & Audit Documentation | Limited | |
| Discounted Migration to Other Platforms |
Why Choose 3rd Party Support for Mattermost 7.9?
Vulnerability Remediation
Scanning, mitigation and patch-around guidance for Mattermost 7.9 when the vendor no longer ships fixes.
Compliance Maintenance
Procedure review, controls evidence and the documentation auditors ask for — maintained continuously, not scrambled at audit time.
24/7 Expert Support
Engineers who know this release monitor, manage and fix issues around the clock — break/fix to managed operations.
Mattermost 7.9 Support: Frequently Asked Questions
Is the Mattermost 7.9 still supported?
Mattermost ended support for the Mattermost 7.9 on Jul 15, 2023 — no more patches or fixes from the vendor. Third-party support keeps it covered: our engineers manage issues, remediate vulnerabilities, and help you maintain compliance for as long as you run it.
When is the Mattermost 7.9 end of service life (EOSL) date?
Mattermost lists the end of service life for the Mattermost 7.9 as Jul 15, 2023.
Can I keep using the Mattermost 7.9 after its EOSL date?
Yes. EOSL means Mattermost stops issuing patches and support — the software itself keeps running. Third-party support covers it from there: issue management, security vulnerability remediation, and the compliance documentation auditors ask for, for as long as you choose to run it.
How much does third-party support for the Mattermost 7.9 cost?
Typically 40-70% below the OEM maintenance renewal price. Exact pricing depends on quantity, service level and location — request a quote and we respond within 24 hours.
Known Vulnerabilities Affecting Mattermost 7.9
32 published CVEs affect the Mattermost 7.9, including 1 rated critical or high severity. Mattermost no longer ships security patches for this release — our engineers provide mitigation guidance, workarounds and hardening support.
| CVE | Severity | CVSS | Published | Summary |
|---|---|---|---|---|
| CVE-2023-1831 | HIGH | 7.2 | Apr 17, 2023 | Mattermost fails to redact from audit logs the user password during user creation and the user password hash in other operations if the experimental audit logging configuration was enabled (ExperimentalAuditSettings section in config). |
| CVE-2025-55070 | MEDIUM | 6.5 | Nov 14, 2025 | Mattermost versions <11 fail to enforce multi-factor authentication on WebSocket connections which allows unauthenticated users to access sensitive information via WebSocket events |
| CVE-2023-3581 | MEDIUM | 6.2 | Jul 17, 2023 | Mattermost fails to properly validate the origin of a websocket connection allowing a MITM attacker on Mattermost to access the websocket APIs. |
| CVE-2025-27936 | MEDIUM | 5.3 | Apr 16, 2025 | Mattermost Plugin MSTeams versions <2.1.0 and Mattermost Server versions 10.5.x <=10.5.1 with the MS Teams plugin enabled fail to perform constant time comparison on a MSTeams plugin webhook secret which allows an attacker to retrieve the webhook secret of the MSTeams plugin via a timing attack during webhook secret comparison. |
| CVE-2023-3591 | MEDIUM | 4.8 | Jul 17, 2023 | Mattermost fails to invalidate previously generated password reset tokens when a new reset token was created. |
| CVE-2023-2515 | MEDIUM | 4.7 | May 12, 2023 | Mattermost fails to restrict a user with permissions to edit other users and to create personal access tokens from elevating their privileges to system admin |
| CVE-2026-2461 | MEDIUM | 4.3 | Mar 16, 2026 | Mattermost Plugins versions <=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members. Mattermost Advisory ID: MMSA-2025-00559 |
| CVE-2025-11776 | MEDIUM | 4.3 | Nov 14, 2025 | Mattermost versions <11 fail to properly restrict access to archived channel search API which allows guest users to discover archived public channels via the `/api/v4/teams/{team_id}/channels/search_archived` endpoint |
| CVE-2024-1888 | MEDIUM | 4.3 | Feb 29, 2024 | Mattermost fails to check the "invite_guest" permission when inviting guests of other teams to a team, allowing a member with permissions to add other members but not to add guests to add a guest to a team as long as the guest was already a guest in another team of the server |
| CVE-2024-24988 | MEDIUM | 4.3 | Feb 29, 2024 | Mattermost fails to properly validate the length of the emoji value in the custom user status, allowing an attacker to send multiple times a very long string as an emoji value causing high resource consumption and possibly crashing the server. |
| CVE-2024-23493 | MEDIUM | 4.3 | Feb 29, 2024 | Mattermost fails to properly authorize the requests fetching team associated AD/LDAP groups, allowing a user to fetch details of AD/LDAP groups of a team that they are not a member of. |
| CVE-2024-1887 | MEDIUM | 4.3 | Feb 29, 2024 | Mattermost fails to check if compliance export is enabled when fetching posts of public channels allowing a user that is not a member of the public channel to fetch the posts, which will not be audited in the compliance export. |
| CVE-2024-1402 | MEDIUM | 4.3 | Feb 9, 2024 | Mattermost fails to check if a custom emoji reaction exists when sending it to a post and to limit the amount of custom emojis allowed to be added in a post, allowing an attacker sending a huge amount of non-existent custom emojis in a post to crash the mobile app of a user seeing the post and to crash the server due to overloading when clients attempt to retrive the aforementioned post. |
| CVE-2023-48732 | MEDIUM | 4.3 | Jan 2, 2024 | Mattermost fails to scope the WebSocket response around notified users to a each user separately resulting in the WebSocket broadcasting the information about who was notified about a post to everyone else in the channel. |
| CVE-2023-47858 | MEDIUM | 4.3 | Jan 2, 2024 | Mattermost fails to properly verify the permissions needed for viewing archived public channels, allowing a member of one team to get details about the archived public channels of another team via the GET /api/v4/teams/<team-id>/channels/deleted endpoint. |
| CVE-2023-49809 | MEDIUM | 4.3 | Dec 12, 2023 | Mattermost fails to handle a null request body in the /add endpoint, allowing a simple member to send a request with null request body to that endpoint and make it crash. After a few repetitions, the plugin is disabled. |
| CVE-2023-4478 | MEDIUM | 4.3 | Aug 25, 2023 | Mattermost fails to restrict which parameters' values it takes from the request during signup allowing an attacker to register users as inactive, thus blocking them from later accessing Mattermost without the system admin activating their accounts. |
| CVE-2023-3614 | MEDIUM | 4.3 | Jul 17, 2023 | Mattermost fails to properly validate a gif image file, allowing an attacker to consume a significant amount of server resources, making the server unresponsive for an extended period of time by linking to specially crafted image file. |
| CVE-2023-3593 | MEDIUM | 4.3 | Jul 17, 2023 | Mattermost fails to properly validate markdown, allowing an attacker to crash the server via a specially crafted markdown input. |
| CVE-2023-3585 | MEDIUM | 4.3 | Jul 17, 2023 | Mattermost Boards fail to properly validate a board link, allowing an attacker to crash a channel by posting a specially crafted boards link. |
Showing the 20 most severe of 32 known CVEs.
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