CVE-2025-27715:The CVE-2025-27715 is a vulnerability in Mattermost versions 9.11.x <= 9.11.8 where the system fails to prompt for explicit approval before adding a team admin to a private channel. This allows team admins to join private channels via crafted permalink links without explicit consent.

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Description Preview

The vulnerability, identified as CVE-2025-27715, affects Mattermost versions 9.11.x up to and including 9.11.8. The issue arises from the system's failure to prompt for explicit approval before adding a team admin to a private channel. This flaw could allow team admins to join private channels via crafted permalink links without obtaining explicit consent from the relevant parties. The vulnerability has been assigned a CVSS base score of 3.3, indicating a low severity level. The problem type is categorized as CWE-863, which refers to Incorrect Authorization.

Overview

Mattermost versions 9.11.x <= 9.11.8 are affected by a vulnerability that allows team admins to join private channels without explicit consent. The vulnerability is due to the system's failure to prompt for explicit approval before adding a team admin to a private channel. The issue was discovered internally and has been published by Mattermost. The vulnerability has a CVSS base score of 3.3, indicating a low severity level.

Remediation

To mitigate this vulnerability, users are advised to update their Mattermost to versions 10.5.0, 9.11.9 or higher. It is always recommended to keep software and systems up to date to prevent potential exploitation of known vulnerabilities.

References

For more information about this vulnerability, you can refer to the following resources:

Industry ExposureMost to least
This section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.

  1. Manufacturing
    Manufacturing
  2. Accommodation & Food Services
    Accommodation & Food Services
  3. Administrative, Support, Waste Management & Remediation Services
    Administrative, Support, Waste Management & Remediation Services
  4. Agriculture, Forestry Fishing & Hunting
    Agriculture, Forestry Fishing & Hunting
  5. Arts, Entertainment & Recreation
    Arts, Entertainment & Recreation
  6. Construction
    Construction
  7. Educational Services
    Educational Services
  8. Finance and Insurance
    Finance and Insurance
  9. Health Care & Social Assistance
    Health Care & Social Assistance
  10. Information
    Information
  11. Management of Companies & Enterprises
    Management of Companies & Enterprises
  12. Mining
    Mining
  13. Other Services (except Public Administration)
    Other Services (except Public Administration)
  14. Professional, Scientific, & Technical Services
    Professional, Scientific, & Technical Services
  15. Public Administration
    Public Administration
  16. Real Estate Rental & Leasing
    Real Estate Rental & Leasing
  17. Retail Trade
    Retail Trade
  18. Transportation & Warehousing
    Transportation & Warehousing
  19. Utilities
    Utilities
  20. Wholesale Trade
    Wholesale Trade

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