CVE-2020-5810 json
A stored XSS vulnerability exists in Umbraco CMS <= 8.9.1 or current.
published 2020-12-30 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-26966
- cvss
- 5.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 62.0%
- EPSS 62.0% chance of exploitation in 30 days, percentile 99.1%
- public exploits
- 0
- none known
Summary
A stored XSS vulnerability exists in Umbraco CMS <= 8.9.1 or current. An authenticated user authorized to upload media can upload a malicious .svg file which act as a stored XSS payload.
Exploit prediction
61.95% chance of exploitation in the next 30 days, higher than 99.1% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- tenable.com https://www.tenable.com/security/research/tra-2020-59 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/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
- n/a Umbraco CMS
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
tenable.com
/security/research/tra-2020-59
exploit, third-party-advisory
Sources
- CVE List CVE-2020-5810
- NVD CVE-2020-5810
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.