CVE-2025-54425Network attack vector

Unauthorized content disclosure via API-key-insensitive output caching

Published Jul 30, 2025 · Updated Jul 30, 2025

Information disclosure in Umbraco CMS allows remote attackers to read API-key-protected content through cached Delivery API responses. DeliveryApiOutputCachePolicy enables output caching for non-preview requests without varying cache entries by the API-key header, so an unauthenticated request can receive a response cached for a valid key. Exposure requires API-key restriction and output caching together, and affects 13.0.0 through 13.9.2, 15.0.0 through 15.4.3, and 16.0.0 through 16.1.0; disclosed impact is limited to reading recently primed paths and queries.

CVSS severity5.3
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Umbraco CMS allows remote attackers to read API-key-protected content through cached Delivery API responses. DeliveryApiOutputCachePolicy enables output caching for non-preview requests without varying cache entries by the API-key header, so an unauthenticated request can receive a response cached for a valid key. Exposure requires API-key restriction and output caching together, and affects 13.0.0 through 13.9.2, 15.0.0 through 15.4.3, and 16.0.0 through 16.1.0; disclosed impact is limited to reading recently primed paths and queries.

The record

CVE
CVE-2025-54425
Published
Jul 30, 2025
Updated
Jul 30, 2025
Vendor
Umbraco
Product
Umbraco CMS
Classifications
CWE-200, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=>= 13.0.0, < 13.9.3
  2. Affected versionversion=>= 15.0.0, < 15.4.4
  3. Affected versionversion=>= 16.0.0, < 16.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Umbraco · Umbraco CMSversion=>= 13.0.0, < 13.9.3; version=>= 15.0.0, < 15.4.4; version=>= 16.0.0, < 16.1.1

Published CVSS scores

5.3GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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