Discourse up to 2026.1.1/2026.2.0/2026.3.0-latest policy_enabled authorization

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability has been found in Discourse up to 2026.1.1/2026.2.0/2026.3.0-latest and classified as problematic. Affected is an unknown function of the component policy_enabled Handler. The manipulation leads to authorization. This vulnerability is uniquely identified as CVE-2026-28282. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Discourse up to 2026.1.1/2026.2.0/2026.3.0-latest and classified as problematic. This issue affects an unknown part of the component policy_enabled Handler. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. Impacted is integrity. The summary by CVE is:

Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a security flaw in the discourse-policy plugin which allowed a user with policy creation permission to gain membership access to any private/restricted groups. Once membership to a private/restricted group has been obtained, the user will be able to read private topics that only the group has access to. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, review all policies for the use of `add-users-to-group` and temporarily remove the attribute from the policy. Alternatively, disable the discourse-policy plugin by disabling the `policy_enabled` site setting.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-28282 since 02/26/2026. The exploitation is known to be easy. The attack may be initiated remotely. Neither technical details nor an exploit are publicly available.

Upgrading to version 2026.1.2 or 2026.2.1 eliminates this vulnerability. Applying the patch 64e2514ac17046cfaa8bc68a3c5140bc40736add is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Authorization
CWE: CWE-863 / CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Discourse 2026.1.2/2026.2.1
Patch: 64e2514ac17046cfaa8bc68a3c5140bc40736add

Timelineinfo

02/26/2026 CVE reserved
03/20/2026 +22 days Advisory disclosed
03/20/2026 +0 days VulDB entry created
03/24/2026 +4 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-6cc8-x3rm-j5pf
Status: Confirmed

CVE: CVE-2026-28282 (🔒)
GCVE (CVE): GCVE-0-2026-28282
GCVE (VulDB): GCVE-100-351977

Entryinfo

Created: 03/20/2026 08:34
Updated: 03/24/2026 15:12
Changes: 03/20/2026 08:34 (69), 03/24/2026 15:12 (12)
Complete: 🔍
Cache ID: 216::103

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