CVE intelligence and bounded remediation

CVE-2023-30963 — Palantir Foundry Frontend security vulnerability

Medium CVSS 5.4

A security defect was discovered in Foundry Frontend which enabled users to perform Stored XSS attacks in Slate if Foundry's CSP were to be bypassed. This defect was resolved with the release of Foundry Frontend 6.229.0. The service was rolled out to all affected Foundry instances. No further intervention is required.

Severity
Medium
CVSS
5.4 (3.1)
Published
2023-07-10
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-82, CWE-79

Affected products

  • palantir / foundry_frontend

Matched remediation archetype

Cross-site scripting and unsafe browser output

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

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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