CVE-2026-45775

Published: Jun 12, 2026Modified: Jun 17, 2026

6.8

Vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N

Exploitability: 2.3 / Impact: 4.0

Source: security-advisories@github.com (Secondary)

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.

Affected (5)

Products: Discourse: Discourse

Discourse

1 product

Discourse

Configuration A

5 vulnerable

Vulnerable Software	Affected Versions
Discourse Discourse	Before 2026.1.0
Discourse Discourse	From 2026.1.0 to 2026.1.4
Discourse Discourse	From 2026.3.0 to 2026.3.1
Discourse Discourse	From 2026.4.0 to 2026.4.1
Discourse Discourse	Version 2026.5.0

Related CWEs

CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

References (1)

https://github.com/discourse/discourse/security/advisories/GHSA-5j6v-4x6g-9pg5

Source: security-advisories@github.com

Third Party Advisory

Timeline

No history available yet.