CVE-2021-35240
Stored XSS via Help Server settings
A security researcher stored XSS via a Help Server setting. This affects customers using Internet Explorer, because they do not support 'rel=noopener'.
Attack profile
How easy it is to exploit
- Attack vector
- Adjacent network
- Complexity
- High
- Privileges needed
- High
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Stored XSS via Help Server settings
A security researcher stored XSS via a Help Server setting. This affects customers using Internet Explorer, because they do not support 'rel=noopener'.
- Record
CVE-2021-35240- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:L/A:L - Weakness
- CWE-79
- Updated
- 2026-11-02
EUVDEUVD-2021-21883
A security researcher stored XSS via a Help Server setting. This affects customers using Internet Explorer, because they do not support 'rel=noopener'.
- Record
EUVD-2021-21883- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:L/A:L - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-ch69-82p3-hfw4 No score
A security researcher stored XSS via a Help Server setting. This affects customers using Internet...
A security researcher stored XSS via a Help Server setting. This affects customers using Internet Explorer, because they do not support 'rel=noopener'.
- Record
GHSA-ch69-82p3-hfw4- Weakness
- CWE-79
- Updated
- 2026-11-02
NVD
A security researcher stored XSS via a Help Server setting. This affects customers using Internet Explorer, because they do not support 'rel=noopener'.
- Record
CVE-2021-35240- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:L/A:L - CVSS 3.1
- 4.8 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 3.5 Low
AV:N/AC:M/Au:S/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-35240 is a medium vulnerability (CVSS 6.5) in Solarwinds Orion Platform, published August 31, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.07%, the 65th percentile. No source names a fixed version.
References
documentation.solarwinds.com/en/success_center/orionplatform/content/core-secure-configuration.htm
support.solarwinds.com/SuccessCenter/s/article/Orion-Platform-2020-2-6-Hotfix-1?language=en_US
solarwinds.com/trust-center/security-advisories/cve-2021-35240
nvd.nist.gov/vuln/detail/CVE-2021-35240
github.com/advisories/GHSA-ch69-82p3-hfw4