CVE-2025-64528Network attack vector

Full-name disclosure via unfiltered user search weights

Published Dec 30, 2025 · Updated Dec 30, 2025

Information disclosure in Discourse before 3.5.3, 2025.11.1, or 2025.12.0 allows remote attackers to retrieve users' full names through UI or API search. Search#user_search queried every weighted search_data field, including User#name at weight B, without excluding that weight when enable_names was disabled. Exploitation requires disabled name display and knowledge of part of a username; a matching response reveals the corresponding full name.

CVSS severity6.3
Medium
EPSS probability0.28%
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 before 3.5.3, 2025.11.1, or 2025.12.0 allows remote attackers to retrieve users' full names through UI or API search. Search#user_search queried every weighted search_data field, including User#name at weight B, without excluding that weight when enable_names was disabled. Exploitation requires disabled name display and knowledge of part of a username; a matching response reveals the corresponding full name.

The record

CVE
CVE-2025-64528
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
Discourse
Product
Discourse
Classifications
CWE-202, T1589.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 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=>= 2025.11.0-latest, < 2025.11.1
  2. Affected versionversion=>= 2025.12.0-latest, < 2025.12.0
  3. Affected versionversion=< 3.5.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Discourse · Discourseversion=>= 2025.11.0-latest, < 2025.11.1; version=>= 2025.12.0-latest, < 2025.12.0; version=< 3.5.3

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
6.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA: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-202Exposure of Sensitive Information Through Data Queries
T1589.003Gather Victim Identity Information: Employee Names

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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