CVE-2021-35240 json
Stored XSS via Help Server settings
published 2021-08-31 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-21883
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 65%
- public exploits
- 0
- none known
Summary
A security researcher stored XSS via a Help Server setting. This affects customers using Internet Explorer, because they do not support 'rel=noopener'.
Patch / fix
- SolarWinds Orion Platform 2020.2.6 HF1
Exploit prediction
1.07% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:L/A:L |
| NVD | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 3.5 | AV:N/AC:M/Au:S/C:N/I:P/A:N |
Affected products
- SolarWinds Orion Platform
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
support.solarwinds.com
/SuccessCenter/s/article/Mitigate-the-Stored-XSS-via-Help-Server-setting-CVE-2021-35240?language=en_US
patch, vendor-advisory
-
documentation.solarwinds.com
/en/success_center/orionplatform/content/core-secure-configuration.htm
product, vendor-advisory
-
support.solarwinds.com
/SuccessCenter/s/article/Orion-Platform-2020-2-6-Hotfix-1?language=en_US
mitigation, vendor-advisory
-
solarwinds.com
/trust-center/security-advisories/cve-2021-35240
vendor-advisory
Sources
- CVE List CVE-2021-35240
- NVD CVE-2021-35240
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.