CVE-2021-27306
An improper access control vulnerability in the JWT plugin in Kong Gateway prior to 2.3.0.0...
An improper access control vulnerability in the JWT plugin in Kong Gateway prior to 2.3.2.0 allows unauthenticated users access to authenticated routes without a valid token JWT.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
An improper access control vulnerability in the JWT plugin in Kong Gateway prior to 2.3.2.0 allows unauthenticated users access to authenticated routes without a valid token JWT.
- Record
CVE-2021-27306- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:P/I:N/A:N - Weakness
- CWE-706
- Updated
- 2026-11-02
CVE List No score
An improper access control vulnerability in the JWT plugin in Kong Gateway prior to 2.3.2.0 allows unauthenticated users access to authenticated routes without a valid token JWT.
- Record
CVE-2021-27306- Updated
- 2026-11-02
EUVDEUVD-2021-14067 No score
An improper access control vulnerability in the JWT plugin in Kong Gateway prior to 2.3.2.0 allows unauthenticated users access to authenticated routes without a valid token JWT.
- Record
EUVD-2021-14067- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-vh85-5xw7-5gvq
An improper access control vulnerability in the JWT plugin in Kong Gateway prior to 2.3.0.0...
An improper access control vulnerability in the JWT plugin in Kong Gateway prior to 2.3.0.0 allows unauthenticated users access to authenticated routes without a valid token JWT.
- Record
GHSA-vh85-5xw7-5gvq- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-863
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-27306 is a high vulnerability (CVSS 7.5) in Konghq Kong Gateway, published March 18, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.79%, the 78th percentile. No source names a fixed version.
References
docs.konghq.com/enterprise/changelog
medium.com/%40sew.campos/cve-2021-27306-access-an-authenticated-route-on-kong-api-gateway-6ae3d81968a3
nvd.nist.gov/vuln/detail/CVE-2021-27306
github.com/advisories/GHSA-vh85-5xw7-5gvq