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CVE-2026-2461— Missing authorization check allows unauthorized modification of other users' comments on a board

Quick assessment

Affected
Mattermost Mattermost
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mattermost Plugins是美国Mattermost公司的一个插件，提供强大的功能延伸和与服务器和网络/桌面应用程序都紧密整合。 Mattermost Plugins 11.3版本、11.0.3版本、11.2.2版本和10.10.11.0版本存在安全漏洞，该漏洞源于未对评论块修改实施授权检查，可能导致具有编辑者权限的授权攻击者修改其他董事会成员创建的评论。

CVSS 4.3 · Medium EPSS 0.16% · P5
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I. Basic Information for CVE-2026-2461

Vulnerability Information
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Vulnerability Title
Missing authorization check allows unauthorized modification of other users' comments on a board
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost Plugins versions <=11.3 11.0.3 11.2.2 10.10.11.0 fail to implement authorisation checks on comment block modifications, which allows an authorised attacker with editor permission to modify comments created by other board members. Mattermost Advisory ID: MMSA-2025-00559
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost Plugins 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost Plugins是美国Mattermost公司的一个插件，提供强大的功能延伸和与服务器和网络/桌面应用程序都紧密整合。 Mattermost Plugins 11.3版本、11.0.3版本、11.2.2版本和10.10.11.0版本存在安全漏洞，该漏洞源于未对评论块修改实施授权检查，可能导致具有编辑者权限的授权攻击者修改其他董事会成员创建的评论。
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

Vendor Product Affected Versions CPE Subscribe
Mattermost Mattermost 0 ~ 11.0.3 -

II. Public POCs for CVE-2026-2461

# POC Description Source Link Shenlong Link
1 POC in python for CVE-2026-2461 https://github.com/destiny-creates/CVE-2026-2461-poc POC Details
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III. Intelligence Information for CVE-2026-2461

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

CVE-2026-2476 7.6 HIGH MS Teams plugin sensitive config values not properly masked in support packets
CVE-2026-24458 7.5 HIGH DoS attack via login attempts with multi-megabyte passwords
CVE-2026-2462 6.6 MEDIUM Admin RCE via Malicious Plugin Upload on CI Test Instances
CVE-2026-2454 5.8 MEDIUM DoS in Calls plugin via malformed msgpack in websocket request.
CVE-2026-2456 5.3 MEDIUM Denial of Service via Unbounded Memory Allocation in Integration Actions
CVE-2026-25783 4.3 MEDIUM Denial of service via malformed User-Agent header in getBrowserVersion
CVE-2026-2463 4.3 MEDIUM Unauthorized access to invite ID during team creation
CVE-2026-2457 4.3 MEDIUM WebSocket Message Spoofing via Permalink Embed Manipulation
CVE-2026-2458 4.3 MEDIUM Unauthorized channel enumeration in private teams after member removal
CVE-2026-26246 4.3 MEDIUM Memory Exhaustion via Malformed PSD File Upload
CVE-2026-2578 4.3 MEDIUM Information Disclosure via WebSocket Event When Deleting Unrevealed Burn on Read Posts
CVE-2026-1629 4.3 MEDIUM Permalink Preview Information Disclosure After Permission Revocation
CVE-2026-4265 4.3 MEDIUM Guest user can upload files without permission across teams
CVE-2026-25780 4.3 MEDIUM Memory Exhaustion via Malformed DOC File Upload
CVE-2026-21386 4.3 MEDIUM Private channel enumeration via /mute slash command
CVE-2026-2455 4.3 MEDIUM SSRF bypass via IPv4-mapped IPv6 literals
CVE-2026-24692 4.3 MEDIUM Guest users can bypass read permissions via search API
CVE-2026-26304 4.3 MEDIUM Permission Bypass in Playbook Run Creation
CVE-2026-26230 3.8 LOW Team Admin Privilege Escalation to Demote Members to Guest
CVE-2026-22545 3.1 LOW Password Change Bypass via Auth Switch Endpoint

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-639

V. Comments for CVE-2026-2461

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