CVE-2024-47772Network attack vector

Browser script execution via chat reply excerpts

Published Oct 7, 2024 · Updated Oct 8, 2024

Cross-site scripting in Discourse before 3.3.2 or 3.4.0.beta2 allows remote attackers to run JavaScript through chat reply excerpts. A reply excerpt renders attacker-controlled content from a crafted chat message in a form that executes as script in the recipient's browser. The attack requires a site with CSP disabled and a user to view the reply; code runs in the forum origin and can access data available to that session.

CVSS severity6.5
Medium
EPSS probability0.33%
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 before 3.3.2 or 3.4.0.beta2 allows remote attackers to run JavaScript through chat reply excerpts. A reply excerpt renders attacker-controlled content from a crafted chat message in a form that executes as script in the recipient's browser. The attack requires a site with CSP disabled and a user to view the reply; code runs in the forum origin and can access data available to that session.

The record

CVE
CVE-2024-47772
Published
Oct 7, 2024
Updated
Oct 8, 2024
Vendor
Discourse
Product
Discourse
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 7, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 8, 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 <3.3.2
  2. Affected versionversion=0 <3.4.0_beta2
  3. Affected versionversion=stable: < 3.3.2
  4. Affected versionversion=tests-passed: < 3.4.0.beta2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Discourse · Discourseversion=0 <3.3.2; version=0 <3.4.0_beta2; version=stable: < 3.3.2; version=tests-passed: < 3.4.0.beta2

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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