CVE-2026-3990 Details
Description
A security flaw has been discovered in CesiumGS CesiumJS up to 1.137.0. Affected by this issue is some unknown functionality of the file Apps/Sandcastle/standalone.html. The manipulation of the argument c results in cross site scripting. The attack can be launched remotely. The exploit has been released to the public and may be used for attacks. The presence of this vulnerability remains uncertain at this time. The vendor was contacted early about this disclosure but did not respond in any way. According to CVE-2023-48094, "the vendor's position is that Apps/Sandcastle/standalone.html is part of the CesiumGS/cesium GitHub repository, but is demo code that is not part of the CesiumJS JavaScript library product."
A reflected cross-site scripting vulnerability has been identified in CesiumGS CesiumJS versions through 1.137.0. The issue resides in the Sandcastle standalone demo viewer, specifically within the 'Apps/Sandcastle/standalone.html' file. The vulnerability allows remote attackers to inject malicious scripts by manipulating the URL hash parameter, which is then executed in the context of the victim's browser.
To address this vulnerability, it is recommended to sanitize user input by escaping HTML before inserting it into the DOM. Additionally, validate the 'baseHref' parameter against an allowlist of trusted paths, and implement a Content Security Policy that restricts script execution.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Mar 12, 2026CISA-ADP
Assessed Mar 12, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/AnalogyC0de/public_exp/issues/18 | [email protected] | ExploitIssue TrackingTechnical Analysis |
| https://vuldb.com/?ctiid.350473 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/?id.350473 | [email protected] | AdvisoryBroken LinkPermission Required |
| https://vuldb.com/?submit.769630 | [email protected] | AdvisoryBroken Link |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
| CWE-94 | Improper Control of Generation of Code ('Code Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| CesiumGS CesiumJS | <= 1.137.0 (semver) |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 29, 2026 | Data Remediation | [email protected] |
| Mar 12, 2026 | New CVE Received | [email protected] |