CVE-2026-45775

Name: CVE-2026-45775
Creator: NVD / NIST
Published: 2026-06-12T21:16:23.267+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.8/10EPSS 0.32%

Last modified Jun 17, 2026

CVE-2026-45775 is a medium-severity vulnerability rated 6.8/10 on the CVSS scale. 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. EPSS estimates a 0.32% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.8/10

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

EPSS Probability

0.32%

24.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Discourse	Discourse	< 2026.1.0
Discourse	Discourse	>= 2026.1.0, < 2026.1.4
Discourse	Discourse	>= 2026.3.0, < 2026.3.1
Discourse	Discourse	>= 2026.4.0, < 2026.4.1
Discourse	Discourse	2026.5.0

References

https://github.com/discourse/discourse/security/advisories/GHSA-5j6v-4x6g-9pg5Third Party Advisory

Timeline

Published: Jun 12, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-45775?

How severe is CVE-2026-45775?

CVE-2026-45775 has a CVSS score of 6.8/10 (MEDIUM severity). The EPSS model estimates a 0.32% probability of exploitation in the next 30 days.

How do I fix CVE-2026-45775?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-45775?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST