CVE-2026-45775

Discourse: Cross-site backup access via path traversal in multisite local backups

MEDIUM

6.8

CVSS Score

Published: June 12, 2026 at 08:25 PM UTC

Updated: June 17, 2026 at 09:18 PM UTC

1 product affected across 1 vendorDiscourse

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Severity

MEDIUM6.8

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Discourse · Discourse

95%

v < 2026.1.0v < 2026.1.4v < 2026.3.1v < 2026.4.12026.1.0 ≤ v < 2026.1.42026.3.0 ≤ v < 2026.3.12026.4.0 ≤ v < 2026.4.12026.5.0

Affected range stops below 2026.1.0, so it looks safe — our inference, not a vendor statement

Affected range stops below 2026.1.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 2026.3.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 2026.4.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_CONFIRMThird Party Advisory

Source: cverecord

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.8MEDIUMGitHub_M

Attack Vector: NETWORK
Complexity: LOW
Privileges: HIGH
User Interaction: NONE
Scope: CHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-22

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