CVE-2026-4054
2 advisories.
Go/github.com/mattermost/mattermost-server CVE-2026-4054: medium 4.3
Mattermost doesn't validate the response body of proxied images
Action: Upgrade github.com/mattermost/mattermost-server to 0.0.0-20260414103857-b21ef302025e or later.
go get github.com/mattermost/mattermost-server@v11.5.2go get github.com/mattermost/mattermost-server@v0.0.0-20260414103857-b21ef302025ego get github.com/mattermost/mattermost-server@v11.4.4Affected
| introduced | fixed | last affected |
|---|---|---|
| 11.5.0 | 11.5.2 | - |
| 0.0.0-20250731163400-5b955468ea1e | 0.0.0-20260414103857-b21ef302025e | - |
| 11.4.0 | 11.4.4 | - |
Fixed versions
| 11.5.2 | 0.0.0-20260414103857-b21ef302025e | 11.4.4 |
Sources
- osv: GHSA-j76w-p754-g2w7
- https://nvd.nist.gov/vuln/detail/CVE-2026-4054
- https://github.com/mattermost/mattermost
- https://mattermost.com/security-updates
CVE-2026-4054 · published · modified · JSON
Go/github.com/mattermost/mattermost-server CVE-2026-4054: unknown
Mattermost doesn't validate the response body of proxied images in github.com/mattermost/mattermost-server
Action: Upgrade github.com/mattermost/mattermost-server to 0.0.0-20260414103857-b21ef302025e or later.
go get github.com/mattermost/mattermost-server@v0.0.0-20260414103857-b21ef302025ego get github.com/mattermost/mattermost-server@v11.4.4+incompatiblego get github.com/mattermost/mattermost-server@v11.5.2+incompatibleAffected
| introduced | fixed | last affected |
|---|---|---|
| 0.0.0-20250731163400-5b955468ea1e | 0.0.0-20260414103857-b21ef302025e | - |
| 11.4.0+incompatible | 11.4.4+incompatible | - |
| 11.5.0+incompatible | 11.5.2+incompatible | - |
Fixed versions
| 0.0.0-20260414103857-b21ef302025e | 11.4.4+incompatible | 11.5.2+incompatible |
Sources
- osv: GO-2026-5454
- https://github.com/advisories/GHSA-j76w-p754-g2w7
- https://nvd.nist.gov/vuln/detail/CVE-2026-4054
- https://mattermost.com/security-updates
CVE-2026-4054 · published · modified · JSON