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CVE-2026-1629— Permalink Preview Information Disclosure After Permission Revocation

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是美国Mattermost公司的一个开源协作平台。 Mattermost 10.11.10及之前的10.11.x版本存在安全漏洞，该漏洞源于未在用户失去频道访问权限时使缓存的固定链接预览数据失效，可能导致用户继续查看私有频道内容。

CVSS 4.3 · Medium EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-1629

Vulnerability Information
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Vulnerability Title
Permalink Preview Information Disclosure After Permission Revocation
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 10.11.x <= 10.11.10 Fail to invalidate cached permalink preview data when a user loses channel access which allows the user to continue viewing private channel content via previously cached permalink previews until cache reset or relogin.. Mattermost Advisory ID: MMSA-2026-00580
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在过期或释放后对资源进行操作
Source: CVE Program / CVE List V5
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 10.11.10及之前的10.11.x版本存在安全漏洞，该漏洞源于未在用户失去频道访问权限时使缓存的固定链接预览数据失效，可能导致用户继续查看私有频道内容。
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 10.11.0 ~ 10.11.10 -

II. Public POCs for CVE-2026-1629

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III. Intelligence Information for CVE-2026-1629

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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-2026-2455 4.3 MEDIUM SSRF bypass via IPv4-mapped IPv6 literals
CVE-2026-21386 4.3 MEDIUM Private channel enumeration via /mute slash command
CVE-2026-25780 4.3 MEDIUM Memory Exhaustion via Malformed DOC File Upload
CVE-2026-4265 4.3 MEDIUM Guest user can upload files without permission across teams
CVE-2026-25783 4.3 MEDIUM Denial of service via malformed User-Agent header in getBrowserVersion
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-2026-2578 4.3 MEDIUM Information Disclosure via WebSocket Event When Deleting Unrevealed Burn on Read Posts
CVE-2026-26246 4.3 MEDIUM Memory Exhaustion via Malformed PSD File Upload
CVE-2026-2458 4.3 MEDIUM Unauthorized channel enumeration in private teams after member removal
CVE-2026-2457 4.3 MEDIUM WebSocket Message Spoofing via Permalink Embed Manipulation
CVE-2026-2461 4.3 MEDIUM Missing authorization check allows unauthorized modification of other users' comments on a
CVE-2026-2463 4.3 MEDIUM Unauthorized access to invite ID during team 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-672

V. Comments for CVE-2026-1629

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