CVE-2025-55035— Mattermost Desktop DoS when user has basic authentication server configured
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I. Basic Information for CVE-2025-55035
Vulnerability Information
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Vulnerability Title
Mattermost Desktop DoS when user has basic authentication server configured
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mattermost Desktop App versions <=5.13.0 fail to manage modals in the Mattermost Desktop App that stops a user with a server that uses basic authentication from accessing their server which allows an attacker that provides a malicious server to the user to deny use of the Desktop App via having the user configure the malicious server and forcing a modal popup that cannot be closed.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对因果或异常条件的不恰当检查
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 5.13.0及之前版本存在安全漏洞，该漏洞源于模态窗口管理不当，可能导致攻击者通过恶意服务器配置强制弹出无法关闭的模态窗口，从而拒绝用户使用桌面应用程序。
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 ~ 5.0.13 | - |
II. Public POCs for CVE-2025-55035
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2025-10-16 · 7 CVEs total
| CVE-2025-58073 | 8.1 HIGH | Arbitrary Mattermost Team can be joined by manipulating the OAuth state |
| CVE-2025-58075 | 8.1 HIGH | Arbitrary Mattermost Team can be joined by manipulating the SAML RelayState |
| CVE-2025-41410 | 5.4 MEDIUM | Slack import bypasses email verification for team access controls |
| CVE-2025-41443 | 4.3 MEDIUM | Guest user can discover active public channels |
| CVE-2025-10545 | 3.1 LOW | Guest user can add unauthorized team users to private channels |
| CVE-2025-54499 | 3.1 LOW | Insecure string comparison enables timing attacks |
IV. Related Vulnerabilities
Same product: Mattermost
- CVE-2026-3590
Race Condition in Guest Magic Link Authentication Allows Tok - CVE-2026-28741
CSRF Protection Bypass Allows Updating a User's Authenticati - CVE-2026-27769
Connected Workspaces: Malicious remote server can manipulate - CVE-2026-24661
Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}
Same vendor: Mattermost
- CVE-2026-3590
Race Condition in Guest Magic Link Authentication Allows Tok - CVE-2026-28741
CSRF Protection Bypass Allows Updating a User's Authenticati - CVE-2026-27769
Connected Workspaces: Malicious remote server can manipulate - CVE-2026-24661
Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}
Same weakness: CWE-754
- CVE-2026-41662
Admidio: Missing Minimum Administrator Check in Role Members - CVE-2026-35225
Improper timeout handling in CODESYS EtherNetIP - CVE-2026-35366
uutils coreutils printenv Security Inspection Bypass via UTF - CVE-2026-40343
free5GC UDR: Fail-open handling in PolicyDataSubsToNotifyPos - CVE-2026-40249
free5gc UDR fail-open request handling in PolicyDataSubsToNo
V. Comments for CVE-2025-55035
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