CVE-2026-20719

unknown

Published 2026-03-25 · Modified 2026-03-30

💬 Discuss on Community ✚ Propose mitigation

CVSS v3

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CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CVSS v4 NEW

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not yet in upstream

VIR risk

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Description

Mattermost: Authenticated DoS through failure to prevent rendering of external SVGs on link embeds

Predictions

Exploit likelihood

30%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Package impact

Ecosystem	Package	Vulnerable	Fixed
Go	github.com/mattermost/mattermost/server/v8	`>=11.4.0-rc1,<11.4.1`	`11.4.1`
Go	github.com/mattermost/mattermost/server/v8	`>=11.3.0-rc1,<11.3.2`	`11.3.2`
Go	github.com/mattermost/mattermost/server/v8	`>=11.2.0-rc1,<11.2.4`	`11.2.4`
Go	github.com/mattermost/mattermost/server/v8	`>=8.0.0-20260105080200-d27a2195068d,<8.0.0-20260217110922-b7d4a1f1f59b`	`8.0.0-20260217110922-b7d4a1f1f59b`
Go	github.com/mattermost/mattermost/server/v8	`>=10.11.0-rc1,<10.11.2`	`10.11.2`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.