Riskcovery

CVE-2026-6342

Group prefix matching bypass for subscriptions

State
Published
Severity
4.3 Medium
Published
May 18, 2026
Updated
May 18, 2026
Reserved
Apr 15, 2026

Read the record on cve.org

Description

Mattermost Plugins versions <=11.5 11.1.5 10.13.11 11.3.4.0 fail to appropriately check for valid namespaces which allows plugin users to create subscriptions to groups that were not whitelisted via creating groups that share the same prefix as a whitelisted group. Mattermost Advisory ID: MMSA-2026-00601

Scores

CVSSScoreVectorSource
3.14.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:NMattermost

Weaknesses

Affected Products

ProductVersions
MattermostMattermost
  • 11.1.5 and earlierAffected
  • 10.13.11 and earlierAffected
  • 11.3.4 and earlierAffected
  • 11.6.0Not affected
  • 11.5.2Not affected
  • 10.11.14Not affected
  • 11.4.4Not affected

References

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