CVE-2026-2457

6 advisories.

Go/github.com/mattermost/mattermost/server/v8 CVE-2026-2457: medium 4.3, EPSS 0.11%

Mattermost allows attackers to spoof permalink embeds

Action: Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260123211116-9efe617be8b8 or later.

go get github.com/mattermost/mattermost/server/v8@v8.0.0-20260123211116-9efe617be8b8

Affected

introduced	fixed	last affected
0	8.0.0-20260123211116-9efe617be8b8	-

Fixed versions

8.0.0-20260123211116-9efe617be8b8

Sources

CVE-2026-2457 · published 2026-03-16T15:30:42Z · modified 2026-03-23T18:56:18.286997Z · JSON

Go/github.com/mattermost/mattermost-server CVE-2026-2457: medium 4.3, EPSS 0.11%

Mattermost allows attackers to spoof permalink embeds

Action: Upgrade github.com/mattermost/mattermost-server to 5.3.2-0.20260123211116-9efe617be8b8 or later.

go get github.com/mattermost/mattermost-server@v5.3.2-0.20260123211116-9efe617be8b8

go get github.com/mattermost/mattermost-server@v10.11.11

go get github.com/mattermost/mattermost-server@v11.2.3

go get github.com/mattermost/mattermost-server@v11.3.1

Affected

introduced	fixed	last affected
0	5.3.2-0.20260123211116-9efe617be8b8	-
10.11.0-rc1	10.11.11	-
11.2.0-rc1	11.2.3	-
11.3.0-rc1	11.3.1	-

Fixed versions

5.3.2-0.20260123211116-9efe617be8b8

10.11.11

11.2.3

11.3.1

Sources

CVE-2026-2457 · published 2026-03-16T15:30:42Z · modified 2026-03-23T18:56:18.286997Z · JSON

Go/github.com/mattermost/mattermost-server CVE-2026-2457: unknown, EPSS 0.11%

Mattermost allows attackers to spoof permalink embeds in github.com/mattermost/mattermost-server

Action: Upgrade github.com/mattermost/mattermost-server to 10.11.11+incompatible or later.

go get github.com/mattermost/mattermost-server@v10.11.11+incompatible

go get github.com/mattermost/mattermost-server@v11.2.3+incompatible

go get github.com/mattermost/mattermost-server@v11.3.1+incompatible

Affected

introduced	fixed	last affected
10.11.0-rc1+incompatible	10.11.11+incompatible	-
11.2.0-rc1+incompatible	11.2.3+incompatible	-
11.3.0-rc1+incompatible	11.3.1+incompatible	-

Fixed versions

10.11.11+incompatible

11.2.3+incompatible

11.3.1+incompatible

Sources

CVE-2026-2457 · published 2026-03-23T18:14:47Z · modified 2026-03-23T18:45:15.192153Z · JSON

Go/github.com/mattermost/mattermost-server/v5 CVE-2026-2457: unknown, EPSS 0.11%

Mattermost allows attackers to spoof permalink embeds in github.com/mattermost/mattermost-server

Action: No fix published. Pin and monitor.

Affected

introduced	fixed	last affected
0	-	-

Fixed versions

No fixed version in the source.

Sources

CVE-2026-2457 · published 2026-03-23T18:14:47Z · modified 2026-03-23T18:45:15.192153Z · JSON

Go/github.com/mattermost/mattermost-server/v6 CVE-2026-2457: unknown, EPSS 0.11%

Mattermost allows attackers to spoof permalink embeds in github.com/mattermost/mattermost-server

Action: No fix published. Pin and monitor.

Affected

introduced	fixed	last affected
0	-	-

Fixed versions

No fixed version in the source.

Sources

CVE-2026-2457 · published 2026-03-23T18:14:47Z · modified 2026-03-23T18:45:15.192153Z · JSON

Go/github.com/mattermost/mattermost/server/v8 CVE-2026-2457: unknown, EPSS 0.11%

Mattermost allows attackers to spoof permalink embeds in github.com/mattermost/mattermost-server

Action: Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260123211116-9efe617be8b8 or later.

go get github.com/mattermost/mattermost/server/v8@v8.0.0-20260123211116-9efe617be8b8

Affected

introduced	fixed	last affected
0	8.0.0-20260123211116-9efe617be8b8	-

Fixed versions

8.0.0-20260123211116-9efe617be8b8

Sources

CVE-2026-2457 · published 2026-03-23T18:14:47Z · modified 2026-03-23T18:45:15.192153Z · JSON