CVE-2024-53851Network attack vector

Authenticated service interruption via unbounded inline oneboxes

Published Feb 4, 2025 · Updated Feb 4, 2025

Resource exhaustion in Discourse 3.3.2 and earlier or 3.4.0.beta3 and earlier allows remote authenticated users to interrupt forum functions. InlineOneboxController passed every URL in an unbounded urls parameter to InlineOneboxer for preview processing; the fix rejects arrays over 10 entries and prevents concurrent previews per user. Exploitation requires a logged-in account and affects availability in parts of the application, with no reported confidentiality or integrity impact.

CVSS severity4.3
Medium
EPSS probability0.46%
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 3.3.2 and earlier or 3.4.0.beta3 and earlier allows remote authenticated users to interrupt forum functions. InlineOneboxController passed every URL in an unbounded urls parameter to InlineOneboxer for preview processing; the fix rejects arrays over 10 entries and prevents concurrent previews per user. Exploitation requires a logged-in account and affects availability in parts of the application, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2024-53851
Published
Feb 4, 2025
Updated
Feb 4, 2025
Vendor
Discourse
Product
Discourse
Classifications
CWE-400, T1499.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 2025Record 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=beta: <= 3.4.0.beta3
  2. Affected versionversion=stable: <= 3.3.2
  3. Affected versionversion=tests-passed: <= 3.4.0.beta3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Discourse · Discourseversion=beta: <= 3.4.0.beta3; version=stable: <= 3.3.2; version=tests-passed: <= 3.4.0.beta3

Published CVSS scores

6.5NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.3GitHubCVSS: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
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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