Apache Syncope up to 3.0.15/4.0.3 Keymaster xml external entity reference

Summaryinfo

A vulnerability classified as problematic has been found in Apache Syncope up to 3.0.15/4.0.3. Affected is an unknown function of the component Keymaster. The manipulation leads to xml external entity reference. This vulnerability is uniquely identified as CVE-2026-23795. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Apache Syncope up to 3.0.15/4.0.3. It has been rated as problematic. This issue affects some unknown processing of the component Keymaster. The manipulation with an unknown input leads to a xml external entity reference vulnerability. Using CWE to declare the problem leads to CWE-611. The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Improper Restriction of XML External Entity Reference vulnerability in Apache Syncope Console. An administrator with adequate entitlements to create or edit Keymaster parameters via Console can construct malicious XML text to launch an XXE attack, thereby causing sensitive data leakage occurs. This issue affects Apache Syncope: from 3.0 through 3.0.15, from 4.0 through 4.0.3. Users are recommended to upgrade to version 3.0.16 / 4.0.4, which fix this issue.

It is possible to read the advisory at lists.apache.org. The identification of this vulnerability is CVE-2026-23795. The exploitation is known to be easy. The attack may be initiated remotely. Additional levels of successful authentication are required for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 02/04/2026).

Upgrading to version 3.0.16 or 4.0.4 eliminates this vulnerability.

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Productinfo

Vendor

• Apache

Name

• Syncope

Version

• 3.0.0
• 3.0.1
• 3.0.2
• 3.0.3
• 3.0.4
• 3.0.5
• 3.0.6
• 3.0.7
• 3.0.8
• 3.0.9
• 3.0.10
• 3.0.11
• 3.0.12
• 3.0.13
• 3.0.14
• 3.0.15
• 4.0.0
• 4.0.1
• 4.0.2
• 4.0.3

License

• open-source

Website

• Vendor: https://www.apache.org/

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