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Mattermost vulnerable to cross-site scripting (XSS)

Moderate severity GitHub Reviewed Published Mar 31, 2023 to the GitHub Advisory Database • Updated Apr 7, 2023

Package

gomod github.com/mattermost/mattermost-server (Go)

Affected versions

>= 7.7.0, <= 7.7.1
>= 7.1.0, <= 7.1.5
= 7.8.0

Patched versions

7.7.2
7.1.6
7.8.1
gomod github.com/mattermost/mattermost-server/v5 (Go)
>= 5.0.0, <= 5.39.3
7.1.6
gomod github.com/mattermost/mattermost-server/v6 (Go)
>= 6.0.0, <= 6.7.2
>= 3.3.0, <= 4.10.10
7.1.6
7.1.6

Description

Boards in Mattermost allows an attacker to upload a malicious SVG image file as an attachment to a card and share it using a direct link to the file.

Issue Identifier: MMSA-2023-00139

References

Published by the National Vulnerability Database Mar 31, 2023
Published to the GitHub Advisory Database Mar 31, 2023
Reviewed Apr 7, 2023
Last updated Apr 7, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS score

0.049%
(19th percentile)

Weaknesses

CVE ID

CVE-2023-1776

GHSA ID

GHSA-63f2-6959-2pxj

Source code

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