CVE-2026-19600— Mattermost logs plaintext authentication tokens in debug-level server logs on failed auth attempts
Quick assessment
Affected
Mattermost Mattermost
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Mattermost 版本 11.9.x（≤ 11.9.1）、11.8.x（≤ 11.8.5）、11.7.x（≤ 11.7.10）以及 11.10.x（≤ 11.10.1）在将身份验证令牌写入服务器日志条目前未能对其进行清理（sanitize），导致能够访问服务器日志的攻击者可获取有效的会话令牌或 OAuth 访问令牌，并通过调试级别（debug-level）的 Mattermost 服务器日志冒充已认证用户。 Mattermost 安全公告编号：MMSA-2026-00763
Affected Version Matrix 9
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mattermost | Mattermost | 11.9.0≤ 11.9.1 |
affected |
11.8.0≤ 11.8.5 |
affected | ||
11.7.0≤ 11.7.10 |
affected | ||
11.10.0≤ 11.10.1 |
affected | ||
11.11.0 |
unaffected | ||
11.9.2 |
unaffected | ||
11.8.6 |
unaffected | ||
11.7.11 |
unaffected | ||
| … +1 more rows | |||
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I. Basic Information for CVE-2026-19600
Vulnerability Information
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Vulnerability Title
Mattermost logs plaintext authentication tokens in debug-level server logs on failed auth attempts
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to sanitize authentication tokens before writing them to server log entries, which allows an attacker with access to server logs to obtain valid session tokens or OAuth access tokens and impersonate authenticated users via the debug-level Mattermost server log.. Mattermost Advisory ID: MMSA-2026-00763
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过日志文件的信息暴露
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Mattermost | Mattermost | 11.9.0 ~ 11.9.1 | - |
|
II. Public POCs for CVE-2026-19600
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Same Patch Batch · Mattermost · 2026-10-16 · 15 CVEs total
| CVE-2026-16453 | 7.1 HIGH | Mattermost SAML RelayState forgery allows unauthorized team membership |
| CVE-2026-19541 | 6.5 MEDIUM | Outgoing OAuth connection client secret exposure during connection validation |
| CVE-2026-18551 | 6.5 MEDIUM | Mattermost guest account privilege escalation via member roles API |
| CVE-2026-19621 | 6.5 MEDIUM | Mattermost leaks interactive-message integration secrets to non-admin users via post-delet |
| CVE-2026-16251 | 6.5 MEDIUM | Mattermost local image proxy allows server memory exhaustion via unbounded image response |
| CVE-2026-18795 | 6.4 MEDIUM | Missing server side validation allowed user to quarantine a DM and GM post |
| CVE-2026-18223 | 5.0 MEDIUM | Mattermost invitation tokens not bound to invited email address allowing unauthorized team |
| CVE-2026-19601 | 4.9 MEDIUM | Disclosure of AD/LDAP bind password via Test Connection |
| CVE-2026-19076 | 4.4 MEDIUM | Mattermost fails to reject OAuth application sessions in account type switch, allowing acc |
| CVE-2026-19603 | 4.3 MEDIUM | Private channel ID disclosure via user status endpoints |
| CVE-2026-19867 | 4.3 MEDIUM | Uncapped mention keys in user notification properties allow CPU exhaustion during post pro |
| CVE-2026-18560 | 4.3 MEDIUM | Improper order of authorisations in Mattermost GetFile API leads to an authenticated user |
| CVE-2026-18256 | 4.3 MEDIUM | Private team metadata disclosure via the team search API |
| CVE-2026-18799 | 4.3 MEDIUM | Mattermost Server fails to restrict Slack import account binding, allowing team admins to |
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CVE-2026-18799
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