CVE-2023-49273Network attack vector

Authenticated endpoint access via missing authorization checks

Published Dec 12, 2023 · Updated Aug 2, 2024

Incorrect authorization in Umbraco CMS before 8.18.10, 10.8.1, or 12.3.4 allows remote authenticated users to access restricted endpoints. Backoffice endpoint authorization fails to enforce permissions for redirect URLs, Examine, published cache, telemetry, languages, and stylesheets. Backoffice access alone is sufficient; a low-privilege account can view restricted administrative data and delete redirect URLs even when that feature is disabled.

CVSS severity5.4
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Umbraco CMS before 8.18.10, 10.8.1, or 12.3.4 allows remote authenticated users to access restricted endpoints. Backoffice endpoint authorization fails to enforce permissions for redirect URLs, Examine, published cache, telemetry, languages, and stylesheets. Backoffice access alone is sufficient; a low-privilege account can view restricted administrative data and delete redirect URLs even when that feature is disabled.

The record

CVE
CVE-2023-49273
Published
Dec 12, 2023
Updated
Aug 2, 2024
Vendor
Umbraco
Product
Umbraco CMS
Classifications
CWE-863, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 11.0.0-rc1, < 12.3.4
  2. Affected versionversion=>= 8.0.0, < 8.18.10
  3. Affected versionversion=>= 9.0.0-rc001, < 10.8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Umbraco · Umbraco CMSversion=>= 11.0.0-rc1, < 12.3.4; version=>= 8.0.0, < 8.18.10; version=>= 9.0.0-rc001, < 10.8.1

Published CVSS scores

5.4GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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