What is CVE-2018-6333?

CVE-2018-6333 is a critical-severity vulnerability in Facebook Nuclide, classified under Cross-site Scripting. CVSS score: 9.8/10. Published 2018-12-31.

How severe is CVE-2018-6333?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2018-6333 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Facebook Nuclide

CVE-2018-6333

The hhvm-attach deep link handler in Nuclide did not properly sanitize the provided hostname parameter when rendering. As a result, a malicious URL could be used to render HTML and other content inside of the editor's context, which could potentially be chained to lead to code execution. This issue affected Nuclide prior to v0.290.0.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.023 (81.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Facebook Nuclide — versions v0.290.0, unspecified

Weakness classification (CWE)

Public proof-of-concept exploits

ossf-cve-benchmark/CVE-2018-6333

References

cve-assign@fb.com (Patch, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2018-6333?: CVE-2018-6333 is a critical-severity vulnerability in Facebook Nuclide, classified under Cross-site Scripting. CVSS score: 9.8/10. Published 2018-12-31.
How severe is CVE-2018-6333?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2018-6333 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.