mattermost/mattermost

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Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..

Stars: 39.1k
Forks: 9k
Open beginner issues: 5
Indexed issues: 603
Avg merge: 2d 6h
Merged PRs (30d): 378

Dominant language: TypeScript
License: No license data
Last GitHub push: Sep 19, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted hacktoberfest good first issue

Beginner friendly Everything

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603 open issues indexed

[Bug]: Files in server release tarballs are world-writable Open

Bug Report/Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

mattermost/mattermost#38562 · Opened Sep 16, 2026
[Bug]: Native back button doesnt work on the web Open

Bug Report/Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

mattermost/mattermost#38551 · Opened Sep 15, 2026
Link reference doesn't work correctly Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mattermost/mattermost#38545 · Opened Sep 15, 2026
[Bug]: config.json gets reset to defaults if the disk fills up during startup Open

Difficulty 3/5 1-2 days Newbie friendliness 75/100

mattermost/mattermost#38538 · Opened Sep 14, 2026
[Feature request] Inline math expression autocomplete suggestion Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

mattermost/mattermost#38496 · Opened Sep 12, 2026
Feature: Collapse Details of a Mattermost Message using <details> or similar markup as in github markdown Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

mattermost/mattermost#38480 · 2 reactions · Opened Sep 11, 2026
No desktop notifications or unread badge for new messages in private channels after upgrade to 11.10.1 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mattermost/mattermost#38470 · Opened Sep 11, 2026
[Bug]: Team sidebar icon doesn't show indicator for @mentions in muted channels Open

Bug Report/Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

mattermost/mattermost#38469 · Opened Sep 11, 2026
Feature request: display three reaction suggestions in the `sidebar-right` Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

mattermost/mattermost#38445 · Opened Sep 10, 2026
Allow users to send individual posts without triggering notifications Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

mattermost/mattermost#38443 · Opened Sep 10, 2026
Spacing scale: where do your spacing tokens live? (audit from the Rhythmguard benchmark) Open

Difficulty 2/5 1-3 hours Newbie friendliness 38/100

mattermost/mattermost#38355 · Opened Sep 6, 2026
[Bug]: Open

Bug Report/Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

mattermost/mattermost#38352 · Opened Sep 4, 2026
[Bug]: reducers/plugins/index.ts:25 hasMenuId() returns early is the menu has no submenu Open

Bug Report/Open

Difficulty 1/5 Under an hour Newbie friendliness 88/100

mattermost/mattermost#38263 · 1 comment · Opened Sep 1, 2026
[Bug]: Very high memory usage Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mattermost/mattermost#38260 · 3 comments · Opened Sep 1, 2026
[Bug]: CPA multiselect and multiuser values have no element limit and accept duplicates Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

mattermost/mattermost#38198 · 6 comments · Opened Aug 29, 2026
Feature request: Add reaction marks to the `Threads` window Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

mattermost/mattermost#38184 · Opened Aug 28, 2026
[Bug]: Boards person-property picker loads only first 10 team users — no pagination, later users unassignable without typing a search Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

mattermost/mattermost#38146 · 3 comments · Opened Aug 26, 2026
[Bug]: MessageAttachment.IsValid rejects every numeric ts sent over JSON — int64 case is unreachable Open

Bug Report/Open

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

mattermost/mattermost#38127 · 3 comments · Opened Aug 25, 2026
Feature Request: Inline Audio Player for Audio File Attachments Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

mattermost/mattermost#38112 · Opened Aug 24, 2026
AtMentionProvider suppresses longer-prefix user autocomplete while remote results are pending Open

Difficulty 3/5 1-2 days Newbie friendliness 78/100

mattermost/mattermost#38080 · Opened Aug 21, 2026
[Bug]: the viewer sees the alter text of john profile image in the position of the image in user popover Open

Bug Report/Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

mattermost/mattermost#37884 · 1 comment · Opened Aug 8, 2026
[Bug]: Desktop 6.2.2 issue with switching views in MM Server 11.9.0 Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

mattermost/mattermost#38051 · 5 comments · Opened Aug 7, 2026
[Bug]: Markdown tables in legacy message attachments are constrained to 700px Open

Bug Report/Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

mattermost/mattermost#37883 · 4 comments · Opened Aug 7, 2026
[Bug]: Mattermost Desktop App proposes RC (release candidate) download Open

Bug Report/Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

mattermost/mattermost#37878 · 2 reactions · Opened Aug 7, 2026
[Bug]: Client-side user filter drops "LastName FirstName" matches that the server already returns Open

Bug Report/Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

mattermost/mattermost#37865 · 1 comment · Opened Aug 6, 2026
PDF content extraction can OOM the server Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

mattermost/mattermost#37826 · Opened Aug 4, 2026
[Bug]: Search does not find CVE numbers Open

Bug Report/Open

Difficulty 3/5 1-2 days Newbie friendliness 66/100

mattermost/mattermost#37825 · 2 comments · Opened Aug 4, 2026
[Bug]: gemini:// URLs not clickable links in Mattermost Open

Bug Report/Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

mattermost/mattermost#37803 · 1 comment · Opened Aug 1, 2026
[Bug]: icon_emoji is not preserved by `update` responses to message actions Open

Bug Report/Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

mattermost/mattermost#37792 · Opened Jul 31, 2026
[Bug]: The scrolling is completely broken. Open

Bug Report/Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mattermost/mattermost#37670 · 20 comments · 1 reaction · Opened Jul 26, 2026
[Bug]: Scrolling up through channel history intermittently skips messages and jumps backward Open

Bug Report/Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

mattermost/mattermost#37659 · 1 comment · 1 reaction · Opened Jul 24, 2026
[Bug]: Messages vanish if sent offline and Desktop app restarted Open

Bug Report/Open

Difficulty 4/5 3-5 days Newbie friendliness 50/100

mattermost/mattermost#37593 · Opened Jul 21, 2026
Support post-quantum cryptography Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

mattermost/mattermost#37565 · 1 comment · 1 reaction · Opened Jul 18, 2026
[Bug]: AVIF and JXL images don't render preview Open

Bug Report/Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

mattermost/mattermost#37525 · 5 comments · Opened Jul 15, 2026
Migrate User Authentication Provider to OIDC Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

mattermost/mattermost#37516 · 2 comments · Opened Jul 15, 2026
[Bug]: Gitlab custom URL it is not respected when using setup Open

Bug Report/Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

mattermost/mattermost#37497 · 1 comment · Opened Jul 14, 2026
[Bug]: `import_process` does not check for errors other than file does not exist. Open

Bug Report/Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

mattermost/mattermost#37492 · Opened Jul 14, 2026
Disable DM Feature/Plugin for non permissions? Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

mattermost/mattermost#37484 · 3 comments · Opened Jul 13, 2026
Backport #34420 to release-10.11 Open

Difficulty 2/5 1-3 hours Newbie friendliness 62/100

mattermost/mattermost#37461 · Opened Jul 13, 2026
Update timezone metadata to timezones.json 1.7.2 Open

Difficulty 1/5 Under an hour Newbie friendliness 35/100

mattermost/mattermost#37432 · 2 comments · Opened Jul 10, 2026
[Bug]: Mobile menu backdrop fails to dismiss modal when tapping header/footer zones Open

Bug Report/Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

mattermost/mattermost#37429 · 3 comments · Opened Jul 9, 2026
Reactions: Cache emoijs Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

mattermost/mattermost#37419 · 4 comments · Opened Jul 9, 2026
Add Ability to discover team admin Open

from-jira

Difficulty 3/5 1-2 days Newbie friendliness 55/100

mattermost/mattermost#37406 · 1 comment · Opened Jul 8, 2026
[Bug]: Deleted draft is restored daily Open

Bug Report/Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

mattermost/mattermost#37379 · 1 comment · Opened Jul 7, 2026
[Bug]: Web UI fails to add reaction when autocomplete used for emoji name Open

Bug Report/Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

mattermost/mattermost#37351 · Opened Jul 6, 2026
[Bug]: "Unable to write file" while using s3 and plugin (Clamav) Open

Bug Report/Open

Difficulty 4/5 3-5 days Newbie friendliness 56/100

mattermost/mattermost#37323 · Opened Jul 1, 2026
[Bug]: Unlicensed servers leak broken and obsolete Calls menu options in non-DM channels Open

Bug Report/Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

mattermost/mattermost#37318 · Opened Jul 1, 2026
[Feature] Return unread notifications to direct messages Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

mattermost/mattermost#37292 · Opened Jun 30, 2026
[Bug]: Update fails on app/migrations because of release-11 image tag Open

Bug Report/Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

mattermost/mattermost#37274 · Opened Jun 28, 2026
Mac desktop client requires reload (Cmd-R) to receive messages Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

mattermost/mattermost#37222 · 3 comments · 1 reaction · Opened Jun 25, 2026

mattermost/mattermost

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