Apache Syncope up to 3.0.16/4.0.5/4.1.0 JEXL information exposure

Summaryinfo

A vulnerability was found in Apache Syncope up to 3.0.16/4.0.5/4.1.0. It has been rated as problematic. This vulnerability affects unknown code of the component JEXL Handler. This manipulation causes information exposure. This vulnerability appears as CVE-2026-42797. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Apache Syncope up to 3.0.16/4.0.5/4.1.0. It has been declared as problematic. Affected by this vulnerability is an unknown function of the component JEXL Handler. The manipulation with an unknown input leads to a information exposure vulnerability. The CWE definition for the vulnerability is CWE-202. When trying to keep information confidential, an attacker can often infer some of the information by using statistics. As an impact it is known to affect confidentiality. The summary by CVE is:

Exposure of Sensitive Information Through Data Queries vulnerability in Apache Syncope. An administrator with adequate entitlements for Derived Schemas can create a malicious JEXL expression which allows any administrator with sufficient entitlements for User read to access User-related security-sensitive information. This issue affects Apache Syncope: 3.0 through 3.0.16, 4.0 through 4.0.5, 4.1.0. Users are recommended to upgrade to version 4.0.6 / 4.1.1, which fix this issue by further restricting the JEXL expression definition.

The weakness was presented by Elin Kai. The advisory is shared at lists.apache.org. This vulnerability is known as CVE-2026-42797 since 04/30/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are necessary for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/01/2026). MITRE ATT&CK project uses the attack technique T1592 for this issue.

Upgrading to version 4.0.6 or 4.1.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-31702). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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
• 3.0.16
• 4.0
• 4.0.0
• 4.0.1
• 4.0.2
• 4.0.3
• 4.0.4
• 4.0.5
• 4.1.0

License

• open-source

Website

• Vendor: https://www.apache.org/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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