Discourse up to 2025.12.1/2026.1.0 publish_to_category authorization

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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2.7$0-$5k0.00

Summaryinfo

A vulnerability was found in Discourse up to 2025.12.1/2026.1.0. It has been rated as problematic. This affects the function publish_to_category. Performing a manipulation results in authorization. This vulnerability is known as CVE-2026-28227. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in Discourse up to 2025.12.1/2026.1.0. This affects the function publish_to_category. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as 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. This is going to have an impact on integrity. The summary by CVE is:

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, TL4 users can publish topics into staff-only categories via the `publish_to_category` topic timer, bypassing authorization checks. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-28227 since 02/25/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. The exploitation requires an enhanced level of successful authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 2025.12.2, 2026.1.1 or 2026.2.0 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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: 2.7
VulDB Meta Temp Score: 2.7

VulDB Base Score: 2.7
VulDB Temp Score: 2.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 2.7
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 2025.12.2/2026.1.1/2026.2.0

Timelineinfo

02/25/2026 CVE reserved
02/27/2026 +2 days Advisory disclosed
02/27/2026 +0 days VulDB entry created
03/03/2026 +4 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-m49w-78mh-87jp
Status: Confirmed

CVE: CVE-2026-28227 (🔒)
GCVE (CVE): GCVE-0-2026-28227
GCVE (VulDB): GCVE-100-348075

Entryinfo

Created: 02/27/2026 07:25
Updated: 03/03/2026 12:17
Changes: 02/27/2026 07:25 (68), 03/03/2026 12:17 (12)
Complete: 🔍
Cache ID: 216::103

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