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CVE-2020-5811

29
FAUCET Score

CVE-2020-5811 describes an authenticated path traversal vulnerability in Umbraco CMS versions 8.9.1 and earlier, allowing an authenticated attacker to write arbitrary files outside the intended directory during package installation. This medium-severity vulnerability (CVSS 6.5) has a low attack complexity and can lead to high integrity impact, though it does not affect confidentiality or availability. While not actively exploited in the wild and lacking Metasploit/Nuclei modules, a public exploit (EDB-50241) exists, yet it has garnered minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 8.9.1CPE matchmatch criteria
cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
9.37%
Probability of exploitation in next 30 days
EPSS Percentile
94.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
ExploitDB: EDB-50241 · Aug 31, 2021
This CVE's current EPSS score of 0.0937 is in the 99th percentile among its peer group of 21,954 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (8)

nugetpatch availablevia ghsa
Product: UmbracoCmsFixed in: 8.9.2
esetvendor investigatingvia llm_extracted
hyperledgervendor investigatingvia llm_extracted
mariadbvendor investigatingvia llm_extracted
omronvendor investigatingvia llm_extracted
openrefinevendor investigatingvia llm_extracted
pnpmvendor investigatingvia llm_extracted
twiliovendor investigatingvia llm_extracted

Vendor Advisories (8)

nugetGHSA-936x-wgqv-hhgqmedium

Authenticated path traversal in Umbraco CMS

Apr 13, 2021
twiliollm-twilio-4c8c1fcc64c00d86MEDIUM

Umbraco Cloud CMS Multiple Vulnerabilities

Oct 21, 2020
esetllm-eset-787826ca10b74f28MEDIUM

Umbraco Cloud CMS Multiple Vulnerabilities

Oct 21, 2020
hyperledgerllm-hyperledger-4163a11af33bceb2MEDIUM

Umbraco Cloud CMS Multiple Vulnerabilities

Oct 21, 2020
pnpmllm-pnpm-b6272fd7dfb7d501MEDIUM

Umbraco Cloud CMS Multiple Vulnerabilities

Oct 21, 2020
omronllm-omron-0073181e8c782311MEDIUM

Umbraco Cloud CMS Multiple Vulnerabilities

Oct 21, 2020
openrefinellm-openrefine-847657bed484274bMEDIUM

Umbraco Cloud CMS Multiple Vulnerabilities

Oct 21, 2020
mariadbllm-mariadb-f7106fca295d04f0MEDIUM

Umbraco Cloud CMS Multiple Vulnerabilities

Oct 21, 2020

References

packetstormsecurity.com / files/163965/Umbraco-CMS-8.9.1-Traversal-Arbitrary-File-Write.html
ExploitThird Party AdvisoryVDB Entry
tenable.com / security/research/tra-2020-59
ExploitThird Party Advisory