CVE-2024-54142Network attack vector

Cross-site scripting via entity-decoded onebox excerpts

Published Jan 14, 2025 · Updated Jan 15, 2025

Cross-site scripting in Discourse AI before 92f122c allows remote authenticated users to execute script via a shared conversation onebox. SharedAiConversation#html_excerpt requests entity decoding from PrettyText.excerpt, then interpolates the resulting text into onebox HTML without escaping it. An attacker must be allowed to share an AI Bot conversation publicly, and a user must visit a post embedding it; the injected script then runs in the Discourse origin.

CVSS severity9.0
Critical
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Discourse AI before 92f122c allows remote authenticated users to execute script via a shared conversation onebox. SharedAiConversation#html_excerpt requests entity decoding from PrettyText.excerpt, then interpolates the resulting text into onebox HTML without escaping it. An attacker must be allowed to share an AI Bot conversation publicly, and a user must visit a post embedding it; the injected script then runs in the Discourse origin.

The record

CVE
CVE-2024-54142
Published
Jan 14, 2025
Updated
Jan 15, 2025
Vendor
Discourse
Product
Discourse AI
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 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=< 92f122c

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Discourse · Discourse AIversion=< 92f122c

Published CVSS scores

9.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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