CVE-2026-45775 json
Discourse: Cross-site backup access via path traversal in multisite local backups
published 2026-06-12 4 mo ago modified 2026-09-08 2 mo ago also BIT-discourse-2026-45775 , EUVD-2026-36559 , GHSA-5j6v-4x6g-9pg5
- cvss
- 6.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 25%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bitnami discourse 2026.1.4, 2026.3.1, 2026.4.1
- discourse discourse 2026.1.4, 2026.3.1, 2026.4.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N |
| OSV | 3.1 | 6.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | discourse | >=2026.1.0, <2026.1.4 >=2026.3.0, <2026.3.1 >=2026.4.0, <2026.4.1 |
2026.1.4 2026.3.1 2026.4.1 |
Affected products
- discourse discourse
Classification
- Weakness
-
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory
References
-
github.com
/discourse/discourse/security/advisories/GHSA-5j6v-4x6g-9pg5
third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-45775
web
Sources
- CVE List CVE-2026-45775
- NVD CVE-2026-45775
- OSV BIT-discourse-2026-45775
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.