CVE-2021-43787XSS via prototype pollution
- 9.0CriticalCVSS base score
- 1.3%Exploitation in 30 daysEPSS · top 29% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By GitHub_M
- 13 days later
· 13 days later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Critical9.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Medium6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 1.3% · top 29% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.0.
Affected products
Affected packages
From reviewed advisories of the GitHub Advisory Database.
References
References4
- https://github.com/NodeBB/NodeBB/security/advisories/GHSA-wx69-rvg3-x7fc (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/NodeBB/NodeBB/commit/1783f918bc19568f421473824461ff2ed7755e4c (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/NodeBB/NodeBB/releases/tag/v1.18.5 (opens in a new tab)x_refsource_MISCx_transferred
- https://blog.sonarsource.com/nodebb-remote-code-execution-with-one-shot/ (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-2408 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-wx69-rvg3-x7fc (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-43787)Record last updated .