CVE-2022-39378Network attack vector

Restricted topic-title disclosure via user badges

Published Nov 2, 2022 · Updated Apr 23, 2025

Information disclosure in Discourse 2.8.9 and earlier and 2.9.0.beta10 and earlier allows remote attackers to read restricted topic titles. The user-badge display renders its associated topic title without enforcing the topic's access restriction. No account or user interaction is required, but a badge linked to activity in a restricted topic must already exist, and only its title is disclosed.

CVSS severity5.3
Medium
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Discourse 2.8.9 and earlier and 2.9.0.beta10 and earlier allows remote attackers to read restricted topic titles. The user-badge display renders its associated topic title without enforcing the topic's access restriction. No account or user interaction is required, but a badge linked to activity in a restricted topic must already exist, and only its title is disclosed.

The record

CVE
CVE-2022-39378
Published
Nov 2, 2022
Updated
Apr 23, 2025
Vendor
Discourse
Product
Discourse
Classifications
CWE-200, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 2, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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=<= 2.8.9
  2. Affected versionversion=<= 2.9.0.beta10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Discourse · Discourseversion=<= 2.8.9; version=<= 2.9.0.beta10

Published CVSS scores

5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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-200Exposure of Sensitive Information to an Unauthorized Actor
T1190Exploit Public-Facing Application

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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