CVE-2021-3138 json
In Discourse 2.7.0 through beta1, a rate-limit bypass leads to a bypass of the 2FA requirement for certain forms.
published 2021-01-14 5 y ago modified 2026-09-08 2 mo ago also BIT-discourse-2021-3138 , EUVD-2021-26485
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.1%
- EPSS 3.1% chance of exploitation in 30 days, percentile 87%
- public exploits
- 0
- none known
Summary
In Discourse 2.7.0 through beta1, a rate-limit bypass leads to a bypass of the 2FA requirement for certain forms.
Exploit prediction
3.11% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- packetstormsecurity.com http://packetstormsecurity.com/files/162256/Discourse-2.7.0-2FA-Bypass.html referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | discourse | <=2.6.0 |
no fix listed |
Classification
- Weakness
-
- CWE-307 Improper Restriction of Excessive Authentication Attempts
References
-
packetstormsecurity.com
/files/162256/Discourse-2.7.0-2FA-Bypass.html
exploit, third-party-advisory, vdb-entry, advisory
-
github.com
/discourse/discourse/releases
release-notes, third-party-advisory, advisory
-
github.com
/Mesh3l911/Disource
third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-3138
web
Sources
- CVE List CVE-2021-3138
- NVD CVE-2021-3138
- OSV BIT-discourse-2021-3138
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