CVE-2026-27935 json
Discourse leaks private topic metadata to non-authorized users
published 2026-03-19 7 mo ago modified 2026-09-08 2 mo ago also BIT-discourse-2026-27935 , EUVD-2026-13239 , GHSA-wxqr-r4wv-cw76
- cvss
- 6.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 21%
- public exploits
- 0
- none known
Summary
Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have a vulnerability in an API endpoint that discloses private topic metadata of admin users to moderator users even if the moderators do not have access to the private topics. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.
Patch / fix
- bitnami discourse 2026.1.2, 2026.2.1, 2026.4.0
- discourse discourse 2026.1.2, 2026.2.1
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N |
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | discourse | >=2026.1.0, <2026.1.2 >=2026.2.0, <2026.2.1 >=2026.3.0, <2026.4.0 |
2026.1.2 2026.2.1 2026.4.0 |
Affected products
- discourse discourse
Classification
- Weakness
-
- CWE-201 Insertion of Sensitive Information Into Sent Data
References
-
github.com
/discourse/discourse/commit/c0f6e9a903800de0dda65c114418ae703d8a51fc
patch
-
github.com
/discourse/discourse/commit/d8dbb4cb189cded8c9e8b3ada859fc0db3f41897
patch
-
github.com
/discourse/discourse/commit/f37e4fdf8391e4a54f1885a3a5514d390eb28bab
patch
-
github.com
/discourse/discourse/security/advisories/GHSA-wxqr-r4wv-cw76
vendor-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-27935
web
Sources
- CVE List CVE-2026-27935
- NVD CVE-2026-27935
- OSV BIT-discourse-2026-27935
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