CVE-2020-5811 json
Authenticated path traversal in Umbraco CMS
published 5y ago modified last mo. also GHSA-936x-wgqv-hhgq , EUVD-2021-0802
- cvss
- 6.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 9.5%
- EPSS 9.5% chance of exploitation in 30 days, percentile 95%
- public exploits
- 1
- Exploit-DB
Summary
An authenticated path traversal vulnerability exists during package installation in Umbraco CMS <= 8.9.1 or current, which could result in arbitrary files being written outside of the site home and expected paths when installing an Umbraco package.
Patch / fix
- nuget UmbracoCms 8.9.2
Is CVE-2020-5811 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerTimeline
- Published
- First public exploit (EDB-50241)
Exploit prediction
9.48% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- EDB-50241 Umbraco CMS 8.9.1 - Directory Traversal webapps, 2021-08-31
- tenable.com https://www.tenable.com/security/research/tra-2020-59 referenced PoC, tagged "exploit" by a source, unverified
- packetstormsecurity.com http://packetstormsecurity.com/files/163965/Umbraco-CMS-8.9.1-Traversal-Arbitrary-File-Write.html referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:N/I:P/A:N |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| nuget | UmbracoCms | <8.9.2 |
8.9.2 |
Affected products
- n/a Umbraco CMS
Classification
- Weakness
-
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory
References
-
tenable.com
/security/research/tra-2020-59
web, exploit, third-party-advisory
-
packetstormsecurity.com
/files/163965/Umbraco-CMS-8.9.1-Traversal-Arbitrary-File-Write.html
web, exploit, third-party-advisory, vdb-entry
-
nvd.nist.gov
/vuln/detail/CVE-2020-5811
advisory
Sources
- CVE List CVE-2020-5811
- GitHub Advisory GHSA-936x-wgqv-hhgq
- NVD CVE-2020-5811
Fencer Intel 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.