Skip to main content

Discourse CVE-2026-72723

| EUVDEUVD-2026-55660 MEDIUM
Missing Authorization (CWE-862)
2026-08-10 GitHub_M
Authentication Bypass Discourse
5.3
CVSS 3.1 · Vendor: GitHub_M
Share

Severity by source

Vendor (GitHub_M) PRIMARY
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
vuln.today AI
5.3 MEDIUM

Network-accessible unauthenticated endpoint; only tag metadata disclosed, so C:L; no integrity or availability impact.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

3
Patch available
Aug 10, 2026 - 17:03 EUVD
Source Code Evidence Fetched
Aug 10, 2026 - 16:33 vuln.today
Analysis Generated
Aug 10, 2026 - 16:33 vuln.today

DescriptionCVE.org

Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, SiteSerializer.anonymous_default_navigation_menu_tags serializes tags from SiteSetting.default_navigation_menu_tags without applying DiscourseTagging.filter_visible for the anonymous viewer. An unauthenticated user can retrieve restricted tag names and descriptions through /site.json when those tags are limited by inaccessible categories, category tag groups, or tag-group permissions. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.

AnalysisAI

Unauthorized tag enumeration in Discourse exposes restricted tag names and descriptions to unauthenticated users via the /site.json endpoint. The flaw exists in all Discourse releases prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, where the anonymous site serializer populates default navigation menu tags from SiteSettings without invoking the DiscourseTagging.filter_visible visibility guard. …

Unlock full vulnerability intelligence

  • Risk assessment & exploitation conditions
  • Attack chain visualization
  • Remediation with exact patch versions
  • Threat intelligence from 22 sources
  • Personal watchlist & email alerts
Continue with Google Continue with GitHub

Free forever · No credit card required

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
technique details hidden
Delivery
technique details hidden
Exploit
technique details hidden
Execution
technique details hidden
Impact
technique details hidden
Sign in to reveal

Vulnerability AssessmentAI

Exploitation Exploitation requires that a Discourse administrator has (1) configured one or more tags in SiteSetting.default_navigation_menu_tags, AND (2) those tags are associated with categories, category tag groups, or tag-group permission rules that restrict their visibility to specific user groups or trust levels. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 score of 5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N) accurately represents the attack surface: the endpoint is network-accessible with no authentication, no special preconditions, and no user interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade Discourse to one of the patched versions corresponding to your release branch: 2026.1.6, 2026.5.2, 2026.6.1, or 2026.7.0. … Detailed patch versions, workarounds, and compensating controls in full report.
Sign in to read full assessment

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

More in Discourse

View all
CVE-2025-48954 HIGH POC
8.1 Jun 25

Discourse versions prior to 3.5.0.beta6 contain a reflected cross-site scripting (XSS) vulnerability in social login fun
CVE-2024-47773 HIGH POC
8.2 Oct 08

Discourse is an open source platform for community discussion. Rated high severity (CVSS 8.2), this vulnerability is rem
CVE-2021-3138 HIGH POC
7.5 Jan 14

In Discourse 2.7.0 through beta1, a rate-limit bypass leads to a bypass of the 2FA requirement for certain forms. Rated

CVE-2023-38706 MEDIUM POC
6.5 Sep 15

Discourse is an open-source discussion platform. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploi
CVE-2024-53991 MEDIUM POC
5.9 Dec 19

Discourse is an open source platform for community discussion. Rated medium severity (CVSS 5.9), this vulnerability is r
CVE-2025-48877 CRITICAL
9.8 Jun 09

Discourse versions prior to 3.4.4 (stable), 3.5.0.beta5 (beta), and 3.5.0.beta6-dev (tests-passed) contain a critical vu
CVE-2023-47121 CRITICAL
9.8 Nov 10

Discourse is an open source platform for community discussion. Rated critical severity (CVSS 9.8), this vulnerability is
CVE-2021-41163 CRITICAL
9.8 Oct 20

Discourse is an open source platform for community discussion. Rated critical severity (CVSS 9.8), this vulnerability is
CVE-2024-49765 CRITICAL
9.1 Dec 19

Discourse is an open source platform for community discussion. Rated critical severity (CVSS 9.1), this vulnerability is
CVE-2026-53963 CRITICAL
9.0 Jul 09

Stored cross-site scripting in the Discourse discussion platform allows a low-privileged registered user to set a malici
CVE-2022-39356 HIGH
8.8 Nov 02

Discourse is a platform for community discussion. Rated high severity (CVSS 8.8), this vulnerability is remotely exploit
CVE-2026-27934 HIGH
8.7 Mar 19

Unauthorized information disclosure in Discourse discussion platform versions prior to 2026.3.0-latest.1, 2026.2.1, and

Same weakness CWE-862 – Missing Authorization

View all
CVE-2023-52163 HIGH POC
8.8
CVE-2025-6205 CRITICAL POC
9.1
CVE-2025-20362 HIGH POC
8.6
CVE-2017-9232 CRITICAL POC
9.8
CVE-2023-6875 CRITICAL POC
9.8
CVE-2024-4898 CRITICAL POC
9.8
CVE-2023-32117 CRITICAL POC
9.8
CVE-2020-36719 CRITICAL POC
9.8

Same technique Authentication Bypass

View all
CVE-2023-22515 CRITICAL POC
9.8
CVE-2012-4681 CRITICAL POC
9.8
CVE-2013-2465 CRITICAL POC
9.8
CVE-2011-3544 CRITICAL POC
9.8
CVE-2022-40684 CRITICAL POC
9.8
CVE-2025-61882 CRITICAL POC
9.8
CVE-2024-0012 CRITICAL POC
9.3
CVE-2023-46805 HIGH POC
8.2

Share

CVE-2026-72723 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy