Discourse up to 2026.1.1/2026.2.0/2026.3.0-latest API Endpoint insertion of sensitive information into sent data

CVSS Meta Temp Score
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CTI Interest Score
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4.5$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Discourse up to 2026.1.1/2026.2.0/2026.3.0-latest. Impacted is an unknown function of the component API Endpoint. Performing a manipulation results in insertion of sensitive information into sent data. This vulnerability is reported as CVE-2026-27935. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Discourse up to 2026.1.1/2026.2.0/2026.3.0-latest. It has been classified as problematic. This affects an unknown functionality of the component API Endpoint. The manipulation with an unknown input leads to a insertion of sensitive information into sent data vulnerability. CWE is classifying the issue as CWE-201. The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor. This is going to have an impact on confidentiality. 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 vulnerability in an API endpoint that discloses private topic metadata of admin users to moderator users even if the moderators do not have access to the private topics. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-27935 since 02/25/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Additional levels of successful authentication are required for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

Upgrading to version 2026.1.2 or 2026.2.1 eliminates this vulnerability. Applying the patch c0f6e9a903800de0dda65c114418ae703d8a51fc 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.

Be aware that VulDB is the high quality source 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: 4.6
VulDB Meta Temp Score: 4.5

VulDB Base Score: 2.7
VulDB Temp Score: 2.6
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: Insertion of sensitive information into sent data
CWE: CWE-201 / CWE-200 / CWE-284
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: c0f6e9a903800de0dda65c114418ae703d8a51fc

Timelineinfo

02/25/2026 CVE reserved
03/20/2026 +23 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-wxqr-r4wv-cw76
Status: Confirmed

CVE: CVE-2026-27935 (🔒)
GCVE (CVE): GCVE-0-2026-27935
GCVE (VulDB): GCVE-100-351807

Entryinfo

Created: 03/20/2026 07:13
Updated: 03/24/2026 15:12
Changes: 03/20/2026 07:13 (69), 03/24/2026 15:12 (12)
Complete: 🔍
Cache ID: 216::103

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