CVE-2025-13326

TCC permission inheritance via unhardened App Store binary

Published Dec 17, 2025 · Updated Dec 17, 2025

Protection mechanism failure in Mattermost Desktop App before 6.0.0 allows local users to inherit TCC permissions on macOS. The Mac App Store package omits Hardened Runtime from the app's code signature, so copying its binary to a temporary folder preserves the app's TCC grants. Exploitation requires low local privileges and user interaction, and the reported consequence is limited to access or modification through inherited privacy permissions.

CVSS severity3.9
Low
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Protection mechanism failure in Mattermost Desktop App before 6.0.0 allows local users to inherit TCC permissions on macOS. The Mac App Store package omits Hardened Runtime from the app's code signature, so copying its binary to a temporary folder preserves the app's TCC grants. Exploitation requires low local privileges and user interaction, and the reported consequence is limited to access or modification through inherited privacy permissions.

The record

CVE
CVE-2025-13326
Published
Dec 17, 2025
Updated
Dec 17, 2025
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-693, T1548.006
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=6.0.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=0 <=6.0.0

Published CVSS scores

3.9Mattermost, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-693Protection Mechanism Failure
T1548.006TCC Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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