XSS in Nodebb
CVE-2021-43787
Nodebb is an open source Node.js based forum software. In affected versions a prototype pollution vulnerability in the uploader module allowed a malicious user to inject arbitrary data (i.e. javascript) into the DOM, theoretically allowing for an account takeover when used in conjunction with a path traversal vulnerability disclosed at the same time as this report. The vulnerability has been patched as of v1.18.5. Users are advised to upgrade as soon as possible.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.013 (69.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: +0.000
Affected products
- Nodebb — versions >= 1.15.5, < 1.18.5
Weakness classification (CWE)
References
- github.com/NodeBB/NodeBB/security/advisories/GHSA-wx69-rvg3-x7fc (Patch, Third Party Advisory)
- github.com/NodeBB/NodeBB/commit/1783f918bc19568f421473824461ff2ed7755e4c (Patch, Third Party Advisory)
- github.com/NodeBB/NodeBB/releases/tag/v1.18.5 (Patch, Third Party Advisory, Release Notes)
- blog.sonarsource.com/nodebb-remote-code-execution-with-one-shot/ (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-43787?
- CVE-2021-43787 is a critical-severity vulnerability in Nodebb, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2021-11-29.
- How severe is CVE-2021-43787?
- Critical severity. CVSS v3 base score is 9.0 out of 10.