CVE-2023-46130Network attack vector

Reply hiding via unbounded SVG height

Published Nov 10, 2023 · Updated Sep 3, 2024

Resource exhaustion in Discourse stable before 3.1.3 and beta before 3.2.0.beta3 allows remote authenticated users to hide replies. The svgbob and mermaid components accept attacker-controlled SVG height attributes while topic-post.scss imposes no maximum height on SVG or pre elements. A posting account and one of those nondefault components are required; an oversized rendered element makes subsequent topic replies unavailable.

CVSS severity4.3
Medium
EPSS probability0.70%
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 stable before 3.1.3 and beta before 3.2.0.beta3 allows remote authenticated users to hide replies. The svgbob and mermaid components accept attacker-controlled SVG height attributes while topic-post.scss imposes no maximum height on SVG or pre elements. A posting account and one of those nondefault components are required; an oversized rendered element makes subsequent topic replies unavailable.

The record

CVE
CVE-2023-46130
Published
Nov 10, 2023
Updated
Sep 3, 2024
Vendor
Discourse
Product
Discourse
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 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=< 3.1.3
  2. Affected versionversion=>= 3.2.0.beta0, < 3.2.0.beta3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Discourse · Discourseversion=< 3.1.3; version=>= 3.2.0.beta0, < 3.2.0.beta3

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
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 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-770Allocation of Resources Without Limits or Throttling
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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