CVE-2026-44787Network attack vector

Unauthorized whisper access via unchecked group assignment

Published Jul 9, 2026 · Updated Jul 9, 2026

Privilege escalation in affected Discourse 2026.1, 2026.4, and 2026.5 releases allows remote attackers to read and post whispers via signup data. The signup controller accepted primary_group_id from unauthenticated registration data, while whisperer? trusted that field without verifying matching group membership. Exposure requires whispers_allowed_groups to contain at least one group; the default configuration is unaffected, and access is limited to reading and posting whisper content.

CVSS severity8.2
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in affected Discourse 2026.1, 2026.4, and 2026.5 releases allows remote attackers to read and post whispers via signup data. The signup controller accepted primary_group_id from unauthenticated registration data, while whisperer? trusted that field without verifying matching group membership. Exposure requires whispers_allowed_groups to contain at least one group; the default configuration is unaffected, and access is limited to reading and posting whisper content.

The record

CVE
CVE-2026-44787
Published
Jul 9, 2026
Updated
Jul 9, 2026
Vendor
Discourse
Product
Discourse
Classifications
CWE-269, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 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, < 2026.1.5
  2. Affected versionversion=>= 2026.4.0-latest, < 2026.4.2
  3. Affected versionversion=>= 2026.5.0-latest, < 2026.5.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Discourse · Discourseversion=>= 2026.1.0-latest, < 2026.1.5; version=>= 2026.4.0-latest, < 2026.4.2; version=>= 2026.5.0-latest, < 2026.5.1

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
8.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/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.

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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-269Improper Privilege Management
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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