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CVE-2023-49278

Umbraco CMS brute force exploit can be used to collect valid usernames

MEDIUM
5.3
CVSS Score
Published: December 12, 2023 at 07:14 PM UTC
Updated: June 17, 2026 at 06:35 AM UTC
1 product affected across 1 vendorUmbraco-CMS

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

Umbraco is an ASP.NET content management system (CMS). Starting in version 8.0.0 and prior to versions 8.18.10, 10.8.1, and 12.3.4, a brute force exploit can be used to collect valid usernames. Versions 8.18.10, 10.8.1, and 12.3.4 contain a patch for this issue.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Umbraco-CMS· Umbraco
95%
v < 10.8.1v < 12.3.4v < 8.18.1010.0.0 ≤ v < 10.8.112.0.0 ≤ v < 12.3.48.0.0 ≤ v < 8.18.10
Affected range stops below 10.8.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.3.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.18.10, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-7x74-h8cw-qhxq

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-200CWE-307

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