CVE-2026-4054

MediumCVSS 6.5/10Last modified Jun 17, 2026

Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 Fail to validate the response body of proxied images, which allows a remote attacker to enact client-side DoS via an SVG file served from an attacker-controlled origin under a non-SVG Content-Type header (e.g. image/png) embedded in an og:image meta tag or Markdown image link.. Mattermost Advisory ID: MMSA-2026-00630

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-754

Affected software

No affected versions have been published.

Timeline

Published: May 15, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

Related CVEs from 2026

CVE-2026-405419.0An improper neutralization of input during web page generation ('Cross-site Scripting') vulnerability in extract domain in Synology Chat Ser CVE-2026-405427.3Missing critical step in authentication in Apache HttpClient 5.6 allows an attacker to cause the client to accept SCRAM-SHA-256 authenticati CVE-2026-405438.8SOPlanning does not enforce authorization for backup functionalities. An unauthenticated attacker can directly query backup-related endpoint CVE-2026-405445.1SOPlanning is vulnerable to Stored Cross-Site Scripting (XSS) via /process/upload_backup endpoint. An authenticated attacker with access to CVE-2026-405455.1SOPlanning is vulnerable to Reflected XSS via the taches parameter. An attacker can craft a malicious URL which, when opened by authenticate CVE-2026-405468.7SOPlanning is vulnerable to SQL Injection across multiple endpoints and parameters. Attacker with low privileges can inject arbitrary SQL co CVE-2026-405476.4SOPlanning is vulnerable to Path Traversal in backup endpoints. Authenticated remote attacker is able to exploit a vulnerable endpoint and CVE-2026-405486.4SOPlanning does not verify uploaded file extension. An authenticated attacker with access to the backup functionality can upload a crafted Z CVE-2026-405495.1SOPlanning is vulnerable to Cross‑Site Request Forgery (CSRF) in groupe_save create, modify and delete endpoints. An attacker can craft a ma CVE-2026-40554.3Mattermost versions 11.5.x <= 11.5.1 fail to validate team-level run_create permission against the target team when creating a playbook run CVE-2026-405506.9Multiple BinSoft products are vulnerable to Privilege Escalation due to excessive database privileges assigned to the user used by the appli CVE-2026-405518.4Multiple BinSoft products perform client-side authentication. An attacker with access to any application instance connected to the backend s