CVE intelligence and bounded remediation

CVE-2021-37392 — In RPCMS v1.8 and below, the "nickname" variable is not properly sanitized before being displayed on page

Medium CVSS 5.4

In RPCMS v1.8 and below, the "nickname" variable is not properly sanitized before being displayed on page. When the API functions are enabled, the attacker can use API to update user nickname with XSS payload and achieve stored XSS. Users who view the articles published by the injected user will trigger the XSS.

Severity
Medium
CVSS
5.4 (3.1)
Published
2021-07-26
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-79

Affected products

  • rpcms / rpcms

Matched remediation archetype

Cross-site scripting and unsafe browser output

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Check exposure

  • Trace reflected, stored, and DOM-derived untrusted values into HTML, attributes, URLs, styles, scripts, and client-side template sinks.
  • Identify affected origins, authenticated user roles, sensitive browser capabilities, and where content is shared across tenants.
  • Review framework escaping, rich-text sanitization, legacy templates, and client-side rendering paths.

Remediate safely

  • Use context-aware framework output encoding and safe DOM APIs; keep untrusted data out of executable contexts.
  • Sanitize intentionally supported markup with a maintained allowlist policy and validate URLs and attributes separately.
  • Update affected rendering components and add tests for every output context using inert sentinel markup.

Authoritative sources

Complete CVE record and remediation plan

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