CVE-2023-3593Network attack vector

Authenticated server crash via malformed markdown

Published Jul 17, 2023 · Updated Oct 21, 2024

Uncontrolled resource consumption in Mattermost 7.10.2 and earlier allows remote authenticated users to crash the server via crafted markdown. The server's markdown-processing path fails to validate a specially crafted input before processing it; Mattermost has not published the responsible function or resource-exhaustion operation. Any authenticated account able to submit markdown can interrupt the server, while no confidentiality or integrity impact is reported.

CVSS severity4.3
Medium
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Mattermost 7.10.2 and earlier allows remote authenticated users to crash the server via crafted markdown. The server's markdown-processing path fails to validate a specially crafted input before processing it; Mattermost has not published the responsible function or resource-exhaustion operation. Any authenticated account able to submit markdown can interrupt the server, while no confidentiality or integrity impact is reported.

The record

CVE
CVE-2023-3593
Published
Jul 17, 2023
Updated
Oct 21, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=7.10.2
  2. Affected versionversion=0 <=7.8.6
  3. Affected versionversion=0 <=7.9.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermostversion=0 <=7.10.2; version=0 <=7.8.6; version=0 <=7.9.4

Published CVSS scores

4.3MattermostCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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