CVE-2023-37906Network attack vector

Service interruption via oversized post edit reason

Published Jul 28, 2023 · Updated Oct 10, 2024

Resource exhaustion in Discourse before 3.0.6 and 3.1.0.beta1 through 3.1.0.beta6 allows remote authenticated users to cause a service interruption. The Post model accepted an edit_reason without a length limit, allowing a crafted oversized value to consume excessive resources during a post edit. A user must be permitted to edit a post; the reported consequence is limited to service availability.

CVSS severity4.3
Medium
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Discourse before 3.0.6 and 3.1.0.beta1 through 3.1.0.beta6 allows remote authenticated users to cause a service interruption. The Post model accepted an edit_reason without a length limit, allowing a crafted oversized value to consume excessive resources during a post edit. A user must be permitted to edit a post; the reported consequence is limited to service availability.

The record

CVE
CVE-2023-37906
Published
Jul 28, 2023
Updated
Oct 10, 2024
Vendor
Discourse
Product
Discourse
Classifications
CWE-770, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 10, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=< 3.0.6
  2. Affected versionversion=>= 3.1.0.beta1, < 3.1.0.beta7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Discourse · Discourseversion=< 3.0.6; version=>= 3.1.0.beta1, < 3.1.0.beta7

Published CVSS scores

4.3GitHub, Inc.CVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

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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