CVE-2021-43786

Name: CVE-2021-43786
Creator: NVD / NIST
Published: 2021-11-29T20:15:08.133+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.29%

Last modified Jun 17, 2026

CVE-2021-43786 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Nodebb is an open source Node.js based forum software. In affected versions incorrect logic present in the token verification step unintentionally allowed master token access to the API. EPSS estimates a 2.29% chance of exploitation in the next 30 days.

Description

Nodebb is an open source Node.js based forum software. In affected versions incorrect logic present in the token verification step unintentionally allowed master token access to the API. The vulnerability has been patch as of v1.18.5. Users are advised to upgrade as soon as possible.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

2.29%

81.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Nodebb	Nodebb	>= 1.15.0, <= 1.18.4

References

https://blog.sonarsource.com/nodebb-remote-code-execution-with-one-shot/Exploit, Third Party Advisory
https://github.com/NodeBB/NodeBB/commit/04dab1d550cdebf4c1567bca9a51f8b9ca48a500Patch, Third Party Advisory
https://github.com/NodeBB/NodeBB/releases/tag/v1.18.5Release Notes, Third Party Advisory
https://github.com/NodeBB/NodeBB/security/advisories/GHSA-hf2m-j98r-4fqwThird Party Advisory
https://blog.sonarsource.com/nodebb-remote-code-execution-with-one-shot/Exploit, Third Party Advisory
https://github.com/NodeBB/NodeBB/commit/04dab1d550cdebf4c1567bca9a51f8b9ca48a500Patch, Third Party Advisory
https://github.com/NodeBB/NodeBB/releases/tag/v1.18.5Release Notes, Third Party Advisory
https://github.com/NodeBB/NodeBB/security/advisories/GHSA-hf2m-j98r-4fqwThird Party Advisory

Timeline

Published: Nov 29, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43786?

How severe is CVE-2021-43786?

CVE-2021-43786 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.29% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43786?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-43786?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST