What’s Vulnerable › Vulnerabilities

CVE-2021-35240: Stored XSS via Help Server settings

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-31 · updated 2026-06-17
• Weakness: CWE-79

Description

A security researcher stored XSS via a Help Server setting. This affects customers using Internet Explorer, because they do not support 'rel=noopener'.

Affected products

• SolarWinds Orion Platform: through 2020.2.5

References

• https://documentation.solarwinds.com/en/success_center/orionplatform/content/core-secure-configuration.htm
• https://support.solarwinds.com/SuccessCenter/s/article/Mitigate-the-Stored-XSS-via-Help-Server-setting-CVE-2021-35240?language=en_US
• https://support.solarwinds.com/SuccessCenter/s/article/Orion-Platform-2020-2-6-Hotfix-1?language=en_US
• https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35240
• https://documentation.solarwinds.com/en/success_center/orionplatform/content/core-secure-configuration.htm
• https://support.solarwinds.com/SuccessCenter/s/article/Mitigate-the-Stored-XSS-via-Help-Server-setting-CVE-2021-35240?language=en_US
• https://support.solarwinds.com/SuccessCenter/s/article/Orion-Platform-2020-2-6-Hotfix-1?language=en_US
• https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35240

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