PT-2026-28424 · Mattermost · Mattermost

Winfunc · Publicado 2026-03-26 · Atualizado 2026-03-27 · CVE-2026-3115

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Média

Vetor base

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

Name of the Vulnerable Software and Affected Versions Mattermost versions 10.11.x through 10.11.10 Mattermost versions 11.2.x through 11.2.2 Mattermost versions 11.3.x through 11.3.1 Mattermost versions 11.4.x through 11.4.0

Description The application fails to enforce view restrictions when retrieving group member IDs. This allows authenticated guest users to enumerate user IDs outside of their permitted visibility scope through the group retrieval API endpoint. The group retrieval endpoint allows unauthorized access to user IDs.

Recommendations Mattermost versions 10.11.x through 10.11.10 should be updated. Mattermost versions 11.2.x through 11.2.2 should be updated. Mattermost versions 11.3.x through 11.3.1 should be updated. Mattermost versions 11.4.x through 11.4.0 should be updated.

Correção

Incorrect Authorization

Enumeração de Fraquezas

CWE-863

Identificadores relacionados

CVE-2026-3115

GHSA-MPC7-MM28-F6WQ

Produtos afetados

Mattermost

Referências · 7

• https://github.com/mattermost/mattermost · Nota
• https://mattermost.com/security-updates · Aviso do Fabricante
• https://twitter.com/infoflowcloud/status/2037515695106179473 · Publicação no Twitter
• https://nvd.nist.gov/vuln/detail/CVE-2026-3115 · Nota de Segurança
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-3115 · Nota
• https://twitter.com/CVEnew/status/2037513444035797128 · Publicação no Twitter
• https://osv.dev/vulnerability/GHSA-mpc7-mm28-f6wq · Aviso do Fabricante