Unsupported Software Findernotice of vendor support
Software

Mattermost end of life dates

The support dates the endoflife.date record (community-maintained) holds for Mattermost, read on 30 Sep 2026: when security support ends for each version (cycle), when active support ends, and extended support where the record shows it. Below them, what Cyber Essentials, the Essential Eight, CIS Controls v8, PCI DSS and NIST SP 800-53 ask of a version past its end.

Oldest version still in support
11.7, security support to 15 May 2027
Next end date
11.9, security support ends 15 Oct 2026
Editions and channels
LTS marks a long-term support version, with longer dates than the standard versions beside it.
Vendor's own notice
the vendor lifecycle policy for Mattermost, authoritative; each version below links its own notice where the record carries one
Record
Mattermost
Kind
server application
Versions in the record
57
Versions past vendor support
53
Essential Eight class
an application outside the priority classes: Patch applications asks for its removal once no longer supported at ML3; at ML1 and ML2 no held Essential Eight clause turns on it.
Source
endoflife.date/mattermost, community-maintained, MIT licence, read 30 Sep 2026; sources

Mattermost versions and their support dates

as at 30 Sep 2026
CycleReleasedActive support endsSecurity support endsExtended support endsOn the read dateVendor notice
11.1116 Sep 2026not given separately15 Dec 2026none in the recordends within 90 daysnone in the record
11.1014 Aug 2026not given separately15 Nov 2026none in the recordends within 90 daysnone in the record
11.916 Jul 2026not given separately15 Oct 2026none in the recordends within 90 daysnone in the record
11.816 Jun 2026not given separately15 Sep 2026none in the recordpast vendor supportnone in the record
11.715 May 2026not given separately15 May 2027none in the recordsupportednone in the record
11.616 Apr 2026not given separately15 Jul 2026none in the recordpast vendor supportnone in the record
11.516 Mar 2026not given separately15 Jun 2026none in the recordpast vendor supportnone in the record
11.416 Feb 2026not given separately15 May 2026none in the recordpast vendor supportnone in the record
11.316 Jan 2026not given separately15 Apr 2026none in the recordpast vendor supportnone in the record
11.216 Dec 2025not given separately15 Mar 2026none in the recordpast vendor supportnone in the record
11.114 Nov 2025not given separately15 Feb 2026none in the recordpast vendor supportnone in the record
11.016 Oct 2025not given separately15 Jan 2026none in the recordpast vendor supportnone in the record
10.1216 Sep 2025not given separately15 Dec 2025none in the recordpast vendor supportnone in the record
10.1115 Aug 2025not given separately15 Aug 2026none in the recordpast vendor supportnone in the record
10.1016 Jul 2025not given separately15 Oct 2025none in the recordpast vendor supportnone in the record
10.916 Jun 2025not given separately15 Sep 2025none in the recordpast vendor supportnone in the record
10.816 May 2025not given separately15 Aug 2025none in the recordpast vendor supportnone in the record
10.716 Apr 2025not given separately15 Jul 2025none in the recordpast vendor supportnone in the record
10.616 Mar 2025not given separately15 Jun 2025none in the recordpast vendor supportnone in the record
10.5 LTS16 Feb 2025not given separately15 Nov 2025none in the recordpast vendor supportnone in the record
10.416 Jan 2025not given separately15 Apr 2025none in the recordpast vendor supportnone in the record
10.316 Dec 2024not given separately15 Mar 2025none in the recordpast vendor supportnone in the record
10.215 Nov 2024not given separately15 Feb 2025none in the recordpast vendor supportnone in the record
10.116 Oct 2024not given separately15 Jan 2025none in the recordpast vendor supportnone in the record
10.016 Sep 2024not given separately15 Dec 2024none in the recordpast vendor supportnone in the record
9.11 LTS2 Aug 2024not given separately15 May 2025none in the recordpast vendor supportnone in the record
9.1028 Jun 2024not given separately15 Oct 2024none in the recordpast vendor supportnone in the record
9.931 May 2024not given separately15 Sep 2024none in the recordpast vendor supportnone in the record
9.83 May 2024not given separately15 Aug 2024none in the recordpast vendor supportnone in the record
9.73 Apr 2024not given separately15 Jul 2024none in the recordpast vendor supportnone in the record
9.61 Mar 2024not given separately15 Jun 2024none in the recordpast vendor supportnone in the record
9.52 Feb 2024not given separately15 Nov 2024none in the recordpast vendor supportnone in the record
9.48 Jan 2024not given separately15 Apr 2024none in the recordpast vendor supportnone in the record
9.35 Dec 2023not given separately15 Mar 2024none in the recordpast vendor supportnone in the record
9.26 Nov 2023not given separately15 Feb 2024none in the recordpast vendor supportnone in the record
9.113 Oct 2023not given separately15 Jan 2024none in the recordpast vendor supportnone in the record
9.014 Sep 2023not given separately15 Dec 2023none in the recordpast vendor supportnone in the record
8.1 LTS10 Aug 2023not given separately15 May 2024none in the recordpast vendor supportnone in the record
8.09 Jul 2023not given separately15 Oct 2023none in the recordpast vendor supportnone in the record
7.1012 Apr 2023not given separately15 Aug 2023none in the recordpast vendor supportnone in the record
7.914 Mar 2023not given separately15 Jul 2023none in the recordpast vendor supportnone in the record
7.8 LTS14 Feb 2023not given separately15 Nov 2023none in the recordpast vendor supportnone in the record
7.713 Jan 2023not given separately15 Apr 2023none in the recordpast vendor supportnone in the record
7.5 LTS9 Nov 2022not given separately15 Feb 2023none in the recordpast vendor supportnone in the record
7.412 Oct 2022not given separately15 Jan 2023none in the recordpast vendor supportnone in the record
7.314 Sep 2022not given separately15 Dec 2022none in the recordpast vendor supportnone in the record
7.211 Aug 2022not given separately15 Nov 2022none in the recordpast vendor supportnone in the record
7.1 LTS13 Jul 2022not given separately15 May 2023none in the recordpast vendor supportnone in the record
7.013 Jun 2022not given separately15 Sep 2022none in the recordpast vendor supportnone in the record
6.711 May 2022not given separately15 Aug 2022none in the recordpast vendor supportnone in the record
6.67 Apr 2022not given separately15 Jul 2022none in the recordpast vendor supportnone in the record
6.511 Mar 2022not given separately15 Jun 2022none in the recordpast vendor supportnone in the record
6.415 Feb 2022not given separately15 May 2022none in the recordpast vendor supportnone in the record
6.3 LTS13 Jan 2022not given separately15 Oct 2022none in the recordpast vendor supportnone in the record
6.213 Dec 2021not given separately15 Mar 2022none in the recordpast vendor supportnone in the record
6.111 Nov 2021not given separately15 Feb 2022none in the recordpast vendor supportnone in the record
6.08 Oct 2021not given separately15 Jan 2022none in the recordpast vendor supportnone in the record

A version this table does not list is not in the record: the finder reads it as unknown, never supported. The dates are the record's own; nothing here states a date the record does not hold.

What the schemes ask of a version past its end

Cyber Essentials
software on in-scope devices licensed and supported by the vendor, meaning it still receives security updates; unsupported software removed or segregated (SU.1, SU.4). Cyber Essentials Plus: removed, or isolated with compensating controls (PM-02).
Essential Eight
An application outside the priority classes: Patch applications asks for its removal once no longer supported at ML3; at ML1 and ML2 no held Essential Eight clause turns on it.
CIS Controls v8, Safeguard 2.2
only software that still receives vendor support may be marked authorised; unsupported software kept for the mission needs a recorded exception with compensating controls and the acceptance of the remaining risk; support status checked at least monthly.
PCI DSS 12.3.4
hardware and software reviewed at least every 12 months: that vendors still supply timely security fixes, end-of-life announcements documented, and a remediation plan for outdated technology approved by senior management.
NIST SP 800-53 SA-22
system components replaced when support is no longer available from the developer, vendor or manufacturer, or alternative sources of continued support provided.

See the specimen list runCheck your own list