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CVE-2023-2787— Collapsed Reply Threads APIs leak message contents from private channels

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存在安全漏洞，该漏洞源于在访问消息线程时没有检查频道成员身份，导致攻击者使可以用消息线程API访问任意帖子。

CVSS 6.5 · Medium EPSS 0.54% · P44

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2023-2787

Vulnerability Information
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Vulnerability Title
Collapsed Reply Threads APIs leak message contents from private channels
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost fails to check channel membership when accessing message threads, allowing an attacker to access arbitrary posts by using the message threads API.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
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存在安全漏洞，该漏洞源于在访问消息线程时没有检查频道成员身份，导致攻击者使可以用消息线程API访问任意帖子。
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 ~ 7.9.3 -

II. Public POCs for CVE-2023-2787

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III. Intelligence Information for CVE-2023-2787

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Other References for CVE-2023-2787 (1)

Same Patch Batch · Mattermost · 2023-06-16 · 11 CVEs total

CVE-2023-2793 6.5 MEDIUM Stack exhaustion in PreparePostForClientWithEmbedsAndImages
CVE-2023-2792 6.5 MEDIUM Ephemeral messages return private channel contents in permalink previews
CVE-2023-2788 6.2 MEDIUM Deactivated user can retain access using oauth2 api
CVE-2023-2785 4.3 MEDIUM Specially crafted search query can cause large log entries in postgres
CVE-2023-2831 4.3 MEDIUM Denial of Service while unescaping a Markdown string
CVE-2023-2791 4.3 MEDIUM Playbooks lets you edit arbitrary posts
CVE-2023-2786 4.3 MEDIUM Channel commands execution doesn't properly verify permissions
CVE-2023-2783 4.3 MEDIUM App Framework does not checks for the secret provided in the incoming webhook request
CVE-2023-2784 4.2 MEDIUM Apps Framework allows install requests from regular members via an internal path
CVE-2023-2797 3.1 LOW Path traversal in GitHub plugin's code preview feature

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-862

V. Comments for CVE-2023-2787

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