Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1000 CNY

100.0%
Buy Us a Coffee

CVE-2026-2454— DoS in Calls plugin via malformed msgpack in websocket request.

CVSS 5.8 · Medium EPSS 0.15% · P35
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2026-2454

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
DoS in Calls plugin via malformed msgpack in websocket request.
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to handle incorrectly reported array lengths which allows malicious user to cause OOM errors and crash the server via sending corrupted msgpack frames within websocket messages to calls plugin. Mattermost Advisory ID: MMSA-2025-00537
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1287
Source: NVD (National Vulnerability Database)
Vulnerability Title
Mattermost 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost 11.3.0及之前的11.3.x版本、11.2.2及之前的11.2.x版本和10.11.10及之前的10.11.x版本存在安全漏洞，该漏洞源于未正确处理错误报告的数组长度，可能导致恶意用户造成内存不足错误并使服务器崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
MattermostMattermost 11.3.0 ~ 11.3.0 -

II. Public POCs for CVE-2026-2454

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-2454

请登录查看更多情报信息。

Same Patch Batch · Mattermost · 2026-03-16 · 21 CVEs total

CVE-2026-24767.6 HIGHMS Teams plugin sensitive config values not properly masked in support packets
CVE-2026-244587.5 HIGHDoS attack via login attempts with multi-megabyte passwords
CVE-2026-24626.6 MEDIUMAdmin RCE via Malicious Plugin Upload on CI Test Instances
CVE-2026-24565.3 MEDIUMDenial of Service via Unbounded Memory Allocation in Integration Actions
CVE-2026-24554.3 MEDIUMSSRF bypass via IPv4-mapped IPv6 literals
CVE-2026-213864.3 MEDIUMPrivate channel enumeration via /mute slash command
CVE-2026-257804.3 MEDIUMMemory Exhaustion via Malformed DOC File Upload
CVE-2026-42654.3 MEDIUMGuest user can upload files without permission across teams
CVE-2026-257834.3 MEDIUMDenial of service via malformed User-Agent header in getBrowserVersion
CVE-2026-246924.3 MEDIUMGuest users can bypass read permissions via search API
CVE-2026-263044.3 MEDIUMPermission Bypass in Playbook Run Creation
CVE-2026-25784.3 MEDIUMInformation Disclosure via WebSocket Event When Deleting Unrevealed Burn on Read Posts
CVE-2026-262464.3 MEDIUMMemory Exhaustion via Malformed PSD File Upload
CVE-2026-24584.3 MEDIUMUnauthorized channel enumeration in private teams after member removal
CVE-2026-24574.3 MEDIUMWebSocket Message Spoofing via Permalink Embed Manipulation
CVE-2026-24614.3 MEDIUMMissing authorization check allows unauthorized modification of other users' comments on a
CVE-2026-24634.3 MEDIUMUnauthorized access to invite ID during team creation
CVE-2026-16294.3 MEDIUMPermalink Preview Information Disclosure After Permission Revocation
CVE-2026-262303.8 LOWTeam Admin Privilege Escalation to Demote Members to Guest
CVE-2026-225453.1 LOWPassword Change Bypass via Auth Switch Endpoint

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-1287

V. Comments for CVE-2026-2454

No comments yet

Leave a comment