Security readout for executives and security teams
Plain-English summary
Discourse could reveal the names or slugs of private topics, categories, posts, or hidden tags to users who should not see them. The content itself is not described as exposed, but sensitive titles or identifiers may leak through redirects and a 404 search box. Patched versions are available.
Executive priority
Treat as a moderate-priority confidentiality issue. Patch promptly, especially for communities using private areas for sensitive business, customer, legal, or security discussions. This is not described as full content exposure or active exploitation in the provided sources.
Technical view
CVE-2026-23743 is a CWE-200 information disclosure issue in Discourse. Before 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, permalinks to restricted resources redirected unauthorized users to URLs containing restricted resource slugs. The advisory also notes leakage through the 404 page search box. CVSS v4.0 score is 6.9.
Likely exposure
Internet-facing Discourse sites with private topics, restricted categories, private posts, or hidden tags are most relevant. Exposure depends on running an affected version and having permalinks that point to restricted resources.
Exploitation context
The issue is network-accessible, low complexity, requires no privileges, and no user interaction per the CVSS vector. The source bundle does not indicate known active exploitation, and KEV status is false.
Researcher notes
Evidence is limited to the CVE record and GitHub advisory. Affected ranges and fixed versions are clear, but no exploitation-in-the-wild evidence or workaround is provided. The vulnerability impact is limited to slug/title disclosure, not modification or availability impact.
Mitigation direction
- Upgrade Discourse to 3.5.4, 2025.11.2, 2025.12.1, 2026.1.0, or later as applicable.
- Review the GitHub security advisory for release-specific guidance.
- Do not rely on a workaround; the advisory states no known workarounds are available.
- Prioritize sites where private discussion titles or category names are sensitive.
Validation and detection
- Inventory all Discourse instances and record their exact versions.
- Confirm each instance is at or above the patched version for its release track.
- Review whether private topics, restricted categories, private posts, or hidden tags are used.
- In a controlled test, verify unauthorized users cannot see restricted slugs via permalink redirects or 404 behavior.
- Check access logs for unusual unauthenticated requests to permalink URLs, if logging is available.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-200: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-23743 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.9 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS: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 CVE scoreVulnerability scoring details
Base CVSS 4.0 score
6.9MediumVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/discourse/discourse/security/advisories/GHSA-v5jw-rxc6-4cvvCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Exposure of Sensitive Information to an Unauthorized Actor
Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.