Mattermost Server is vulnerable to a Denial of Service attack through `invite_people` command

Description

References

• nvd.nist.gov/vuln/detail/CVE-2018-21258 · ADVISORY
• mattermost/mattermost commit af615ff · WEB
• mattermost/mattermost · PACKAGE
• mattermost.com/security-updates · WEB
• mattermost.com/security-updates · Vendor Advisory
• GitHub Advisory GHSA-5mh6-p63g-3mv5 · ADVISORY

Mais vulnerabilidades de github.com/mattermost/mattermost-server

• CVE-2026-8823BAIXO 3.8Mattermost versions 11.7.x <= 11.7.0, 10.11.x <= 10.11.17 fail to validate bot targets when demoting users to guests which allows a lower-pr…
• CVE-2026-9162MÉDIO 4.3Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to invalidate cached authentication state…
• CVE-2026-8074BAIXO 3.8Mattermost versions 11.7.x <= 11.7.0, 10.11.x <= 10.11.17 fail to enforce bot-specific permission checks on the user active status endpoint,…
• CVE-2026-6673MÉDIO 6.4Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to authenticate Atlassian Connect install…
• CVE-2026-6062MÉDIO 6.4Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 Fail to validate channel ownership of an exist…