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Vulnerability record · CVE-2026-49256 · published 9 July 2026

CVE-2026-49256: Discourse information exposure vulnerability

Discourse · Discourse

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, restricted tag and tag-group names attached to publicly readable categories as allowed_tags, allowed_tag_groups, or required tag groups could leak to anonymous and unauthorized users through category and group endpoints. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

6.3 CVSS 4.0 Medium EPSS 0.51% · top 58.8% CWE-200 · Information exposure
6.3CVSS 4.0 base score
0.51%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
14 Jul 2026Last modified by NVD

Description

Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, restricted tag and tag-group names attached to publicly readable categories as allowed_tags, allowed_tag_groups, or required tag groups could leak to anonymous and unauthorized users through category and group endpoints. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/discourse/discourse/releases/tag/v2026.1.5 Release NotesPatch
https://github.com/discourse/discourse/releases/tag/v2026.4.2 Release Notes
https://github.com/discourse/discourse/releases/tag/v2026.5.1 Release Notes
https://github.com/discourse/discourse/releases/tag/v2026.6.0 Release Notes
https://github.com/discourse/discourse/security/advisories/GHSA-mwp7-572g-6qpx Vendor AdvisoryMitigation

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.9CVE-2025-68662Discourse server-side request forgery (ssrf) vulnerabilityDiscourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, a hostname validation issue in Final…EPSS 0.33%9.8CVE-2023-47121Discourse server-side request forgery (ssrf) vulnerabilityDiscourse is an open source platform for community discussion. Prior to version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` an…EPSS 0.69%9.8CVE-2021-41163Discourse injection vulnerabilityDiscourse is an open source platform for community discussion. In affected versions maliciously crafted requests could lead to remote code execution.…EPSS 20%9.1CVE-2024-49765Discourse vulnerabilityDiscourse is an open source platform for community discussion. Sites that are using discourse connect but still have local logins enabled could allow…EPSS 0.36%9.0CVE-2026-53963Discourse cross-site scripting vulnerabilityDiscourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, a malicious second factor name on an attacker-c…EPSS 0.74%8.8CVE-2022-39356Discourse improper authorization vulnerabilityDiscourse is a platform for community discussion. Users who receive an invitation link that is not scoped to a single email address can enter any non…EPSS 0.61%8.8CVE-2022-21684Discourse improper authentication vulnerabilityDiscourse is an open source discussion platform. Versions prior to 2.7.13 in `stable`, 2.8.0.beta11 in `beta`, and 2.8.0.beta11 in `tests-passed` all…EPSS 0.83%8.7CVE-2026-27934Discourse vulnerabilityDiscourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a lack of visibility checks with a …EPSS 0.42%

Source: NIST National Vulnerability Database (record CVE-2026-49256), CISA KEV, FIRST EPSS (scores of 2026-10-01). This page is refreshed as NVD updates the record.