What is the CVSS score of EUVD-2026-42735?

EUVD-2026-42735 has a CVSS 3.1 base score of 7.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N. EPSS exploitation probability: 0.3%.

Which versions of Discourse are affected by EUVD-2026-42735?

Discourse installations with whisper-group functionality are vulnerable to CVE-2026-44787, a privilege escalation flaw allowing newly registered users unauthorized access to staff-only confidential…. A patch is available.

How to fix or mitigate EUVD-2026-42735?

Within 24 hours, identify all Discourse installations in your environment and confirm which have whispers_allowed_groups enabled, as only those configurations face risk. Within 7 days, apply the vendor-released patch per GHSA-vmwq-jvxx-jwfx advisory to all affected instances, prioritizing production deployments. Within 30 days, audit whisper-group access logs for indicators of unauthorized access and verify patching completion across your Discourse fleet.

Discourse EUVD-2026-42735

| CVE-2026-44787 HIGH

Improper Privilege Management (CWE-269)

2026-07-09 security-advisories@github.com

Privilege Escalation Discourse

7.1

CVSS 3.1 · NVD

Severity by source

Vendor (github) PRIMARY

HIGH

qualitative

NVD

7.1 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

vuln.today AI

8.2 HIGH

Patch tests show injection succeeds on unauthenticated signup, so PR:N and AC:L; whisper read access drives C:H with minor I:L and no availability impact.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (github).

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

None

Lifecycle Timeline

Source Code Evidence Fetched

Jul 14, 2026 - 20:59 vuln.today

Analysis Updated

Jul 14, 2026 - 20:59 vuln.today

v2 (cvss_changed)

Re-analysis Queued

Jul 14, 2026 - 20:52 vuln.today

cvss_changed

CVSS changed

Jul 14, 2026 - 20:52 NVD

8.2 (HIGH) 7.1 (HIGH)

Patch available

Jul 09, 2026 - 23:02 EUVD

Analysis Generated

Jul 09, 2026 - 22:31 vuln.today

DescriptionNVD

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, the signup flow could allow newly registered users to set primary_group_id and gain whisper-group privileges without legitimate group membership on sites with whispers_allowed_groups configured. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

AnalysisAI

Privilege escalation in Discourse (the open-source discussion platform) lets a newly registered user obtain whisper-group ('whisperer') privileges by supplying a primary_group_id during the signup flow, without ever being a legitimate member of that group. Exploitation only matters on sites that have configured whispers_allowed_groups, and success grants read access to staff-only whisper posts (a confidentiality-focused impact). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Delivery

Inject primary_group_id of whisper-allowed group

Exploit

Server saves primary_group_id without membership check

Execution

whisperer? evaluates true

Impact

Read/post staff-only whisper content

Access

Delivery

Inject primary_group_id of whisper-allowed group

Exploit

Server saves primary_group_id without membership check

Execution

whisperer? evaluates true

Impact

Read/post staff-only whisper content

Vulnerability AssessmentAI

Exploitation	Exploitation requires the target Discourse site to have the whispers_allowed_groups site setting configured - a non-default, opt-in staff feature; without it, injecting primary_group_id grants no whisper privilege and the bug is inert. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	The signals are largely consistent and point to a real but moderate-priority issue rather than an emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	On a Discourse forum that has enabled group-based whispers, an attacker scripts the public registration endpoint and includes primary_group_id set to the ID of a whisper-allowed group in the signup payload. Once the account is created, the attacker is treated as a whisperer and can read (and post) staff-only whisper content that should be hidden from ordinary members. …
Remediation	Vendor-released patch: upgrade to Discourse 2026.6.0, 2026.5.1, 2026.4.2, or 2026.1.5 (whichever matches your release branch), available at https://github.com/discourse/discourse/releases (tags v2026.6.0, v2026.5.1, v2026.4.2, v2026.1.5). … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify all Discourse installations in your environment and confirm which have whispers_allowed_groups enabled, as only those configurations face risk. …

Threat intelligence, references, and detailed analysis are available after sign-in.