CVE-2026-27153 json
Discourse doesn't prevent moderators from exporting user Chat DMs
published 2026-02-26 8 mo ago modified 2026-09-08 2 mo ago also BIT-discourse-2026-27153 , EUVD-2026-8894 , GHSA-5cp2-jq8m-33mf
- cvss
- 2.7
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 7%
- public exploits
- 0
- none known
Summary
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, moderators could export user Chat DMs via the CSV export endpoint by exploiting an overly permissive allowlist in `can_export_entity?`. The method allowed moderators to export any entity not explicitly blocked instead of restricting to an explicit allowlist. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.
Patch / fix
- bitnami discourse 2025.12.2, 2026.1.1
- discourse discourse 2025.12.2, 2026.1.1, 2026.2.0
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 8 mo ago
Exploit prediction
0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 1.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U |
| CNA | 4.0 | 1.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/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 | 2.7 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | discourse | <2025.12.2 >=2026.1.0, <2026.1.1 |
2025.12.2 2026.1.1 |
Affected products
- discourse discourse
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
-
github.com
/discourse/discourse/security/advisories/GHSA-5cp2-jq8m-33mf
vendor-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-27153
web
Sources
- CVE List CVE-2026-27153
- NVD CVE-2026-27153
- OSV BIT-discourse-2026-27153
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.