CVE-2024-37165Network attack vector

Stored XSS via permissive Facebook hostname matching

Published Jul 30, 2024 · Updated Aug 2, 2024

Stored cross-site scripting in Discourse before 3.2.3 and 3.3.0.beta1 through 3.3.0.beta2 allows remote authenticated users to run script. The FacebookMediaOnebox URL matcher accepted attacker-controlled hostnames containing a .facebook.com suffix, allowing their Onebox markup to be stored and rendered. A low-privileged account can reach the post composer, but script execution requires the instance's default Content Security Policy to be disabled.

CVSS severity6.3
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Discourse before 3.2.3 and 3.3.0.beta1 through 3.3.0.beta2 allows remote authenticated users to run script. The FacebookMediaOnebox URL matcher accepted attacker-controlled hostnames containing a .facebook.com suffix, allowing their Onebox markup to be stored and rendered. A low-privileged account can reach the post composer, but script execution requires the instance's default Content Security Policy to be disabled.

The record

CVE
CVE-2024-37165
Published
Jul 30, 2024
Updated
Aug 2, 2024
Vendor
Discourse
Product
Discourse
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 30, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=< 3.2.3
  2. Affected versionversion=>= 3.3.0.beta1, < 3.3.0.beta3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Discourse · Discourseversion=< 3.2.3; version=>= 3.3.0.beta1, < 3.3.0.beta3

Published CVSS scores

6.1NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/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-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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