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CVE-2026-45775

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

Medium6.8EPSS 0.32%
Published
Updated
Reserved
Assigned by
GitHub_M

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.

Timeline

  1. ID reserved

    By GitHub_M

  2. · 30 days later

    Published

  3. · 3 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-45775, by who scored it
Scored byCVSSScoreVector
GitHub_MCNA (assigner)3.1Medium6.8CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
NVDNVD · Analyzed3.1Medium6.8CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
EPSS (exploitation in 30 days)
0.32% · top 75% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.8.

Weakness

Affected products

  • discourse · discourse

    • affected >= 2026.1.0-latest, < 2026.1.4
    • affected >= 2026.3.0-latest, < 2026.3.1
    • affected >= 2026.4.0-latest, < 2026.4.1

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

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Record last updated .