CVE-2021-43787

XSS via prototype pollution

MEDIUM
6.1
CVSS Score
Published: November 29, 2021 at 07:30 PM UTC
Updated: June 17, 2026 at 04:11 AM UTC
1 product affected across 1 vendorNodeBB

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Severity
MEDIUM6.1
Exploit prediction
EPSS 1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.18.51.15.5 ≤ v ≤ 1.18.4
Affected range stops below 1.18.5, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79CWE-1321

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