CVE-2023-5876— Regex DoS from a malicious server enrolled in Desktop
Quick assessment
Affected
Mattermost Mattermost Desktop
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 5.5.0版本及之前版本存在安全漏洞，该漏洞源于无法正确验证基于服务器URL路径构建的正则表达式，从而导致服务器拒绝服务。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2023-5876
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Regex DoS from a malicious server enrolled in Desktop
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost fails to properly validate a RegExp built off the server URL path, allowing an attacker in control of an enrolled server to mount a Denial Of Service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
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 5.5.0版本及之前版本存在安全漏洞，该漏洞源于无法正确验证基于服务器URL路径构建的正则表达式，从而导致服务器拒绝服务。
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 Desktop | 0 ~ 5.5.0 | - |
|
II. Public POCs for CVE-2023-5876
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2023-5876
请登录查看更多情报信息。
Same Patch Batch · Mattermost · 2023-11-02 · 3 CVEs total
| CVE-2023-5875 | 3.7 LOW | Lack of Hardening against media exploitation from a remote origin |
| CVE-2023-5920 | 2.9 LOW | Lack Of Secure Keyboard Entry Protection in MacOS Desktop |
IV. Related Vulnerabilities
Same vendor: Mattermost
-
CVE-2026-18799
Mattermost Server fails to restrict Slack import account bin -
CVE-2026-16251
Mattermost local image proxy allows server memory exhaustion -
CVE-2026-18256
Private team metadata disclosure via the team search API -
CVE-2026-18223
Mattermost invitation tokens not bound to invited email addr -
CVE-2026-19076
Mattermost fails to reject OAuth application sessions in acc
Same weakness: CWE-400
-
CVE-2026-113619
Eclipse ioFog renders request templates before authenticatio -
CVE-2026-108062
Pre-authentication OIDC discovery and JWKS fetches run synch -
CVE-2026-112400
Pillow: GIF seek keeps rejected size after DecompressionBomb -
CVE-2026-111766
markdown-it: Quadratic-time denial of service in inline HTML -
CVE-2026-112782
Grav before 1.7.53.5 and 2.2.2 Image Pixel Limit Bypass Deni
V. Comments for CVE-2023-5876
No comments yet