CVE-2026-34947Network attack vector

Unauthenticated staged user disclosure via invite pages

Published Apr 3, 2026 · Updated Apr 3, 2026

Information disclosure in affected Discourse 2026 release branches allows remote attackers to read staged user data via public invite pages. Public invite rendering exposes a staged user's username and custom fields before email verification; Discourse has not published the responsible code-level check. Possession of a public invite URL is the access gate, and exposure is limited to the staged username and configured custom-field values.

CVSS severity5.3
Medium
EPSS probability0.21%
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 affected Discourse 2026 release branches allows remote attackers to read staged user data via public invite pages. Public invite rendering exposes a staged user's username and custom fields before email verification; Discourse has not published the responsible code-level check. Possession of a public invite URL is the access gate, and exposure is limited to the staged username and configured custom-field values.

The record

CVE
CVE-2026-34947
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
Discourse
Product
Discourse
Classifications
CWE-200, T1589
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 2026Record 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=>= 2026.1.0-latest, < 2026.1.3
  2. Affected versionversion=>= 2026.2.0-latest, < 2026.2.2
  3. Affected versionversion=>= 2026.3.0-latest, < 2026.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Discourse · Discourseversion=>= 2026.1.0-latest, < 2026.1.3; version=>= 2026.2.0-latest, < 2026.2.2; version=>= 2026.3.0-latest, < 2026.3.0

Published CVSS scores

2.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U
5.3NIST NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1589Gather Victim Identity Information

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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