Mattermost up to 10.11.20/11.6.5/11.7.3/11.8.0 Remove File Endpoint path traversal

CVSS Meta Temp Score
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CTI Interest Score
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4.5$0-$5k8.66

Summaryinfo

A vulnerability was found in Mattermost up to 10.11.20/11.6.5/11.7.3/11.8.0. It has been classified as problematic. Affected is an unknown function of the component Remove File Endpoint. This manipulation causes path traversal. The identification of this vulnerability is CVE-2026-7521. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in Mattermost up to 10.11.20/11.6.5/11.7.3/11.8.0 and classified as problematic. Affected by this vulnerability is an unknown code block of the component Remove File Endpoint. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Mattermost versions 11.8.x <= 11.8.0, 11.7.x <= 11.7.3, 11.6.x <= 11.6.5, 10.11.x <= 10.11.20 fail to verify file deletion path which allows an admin with SAML system-console write permissions to delete arbitrary files outside the config directory from the server via the remove file endpoint.. Mattermost Advisory ID: MMSA-2026-00666

It is possible to read the advisory at mattermost.com. This vulnerability is known as CVE-2026-7521 since 04/30/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 10.11.21, 11.6.6, 11.7.4, 11.8.1 or 11.9.0 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.7
VulDB Meta Temp Score: 4.5

VulDB Base Score: 4.7
VulDB Temp Score: 4.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Path traversal
CWE: CWE-22
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Mattermost 10.11.21/11.6.6/11.7.4/11.8.1/11.9.0

Timelineinfo

04/30/2026 CVE reserved
07/28/2026 +89 days Advisory disclosed
07/28/2026 +0 days VulDB entry created
07/28/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: mattermost.com
Status: Confirmed

CVE: CVE-2026-7521 (🔒)
GCVE (CVE): GCVE-0-2026-7521
GCVE (VulDB): GCVE-100-383899

Entryinfo

Created: 07/28/2026 17:08
Changes: 07/28/2026 17:08 (54)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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