CVE-2026-45775 Details
Description
Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.4, 2026.3.0-latest to before 2026.3.1, and 2026.4.0-latest to before 2026.4.1, a path traversal vulnerability in Discourse backup handling could allow an authenticated administrator on one site in a multisite deployment to access backup files belonging to another site when backups are stored locally. In affected configurations, an admin on Site A could potentially retrieve sensitive backup data from Site B (same host, multisite) by crafting a backup download request with a traversal payload. This issue has been patched in versions 2026.1.4, 2026.3.1, 2026.4.1, and 2026.5.0-latest.1.
A path traversal vulnerability has been identified in Discourse backup handling, affecting versions 2026.1.0-latest prior to 2026.1.4, 2026.3.0-latest prior to 2026.3.1, and 2026.4.0-latest prior to 2026.4.1. In multisite deployments where backups are stored locally, an authenticated administrator on one site could access backup files from another site on the same host. By crafting a backup download request with a traversal payload, an admin could potentially retrieve sensitive backup data from a different site.
Users can upgrade to Discourse versions 2026.1.4, 2026.3.1, 2026.4.1, or 2026.5.0-latest.1. If an immediate upgrade is not possible, backup storage can be switched to S3, access to backups can be restricted to trusted operators, and admin backup access logs can be monitored for suspicious traversal-style requests.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 15, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/discourse/discourse/security/advisories/GHSA-5j6v-4x6g-9pg5 | [email protected] | Third Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-22 | Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| discourse discourse | < 2026.1.0 >= 2026.1.0, < 2026.1.4 >= 2026.3.0, < 2026.3.1 >= 2026.4.0, < 2026.4.1 2026.5.0 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | Initial Analysis | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 12, 2026 | New CVE Received | [email protected] |