Apache Syncope Log Exposure via AES Key Padding
CVE-2026-87779 Published on September 14, 2026
Apache Syncope: AES Secret Key disclosure via log output
Insertion of sensitive information into log file vulnerability in Apache Syncope.
When AES key of non-standard length (not 16/24/32 bytes) is configured, Syncope will pad the provided value with random characters. The resulting key value is logged.
This issue affects Apache Syncope: from 3.0.15 through 3.0.16, from 4.0.3 through 4.0.7, from 4.1.0-M0 through 4.1.2.
Users are recommended to upgrade to version 4.0.8 / 4.1.3, which fix this issue.
Vulnerability Analysis
CVE-2026-87779 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.
Weakness Type
Insertion of Sensitive Information into Log File
Information written to log files can be of a sensitive nature and give valuable guidance to an attacker or expose sensitive user information.
Products Associated with CVE-2026-87779
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Affected Versions
Apache Software Foundation Apache Syncope:- Version 3.0.15, <= 3.0.16 is affected.
- Version 4.0.3, <= 4.0.7 is affected.
- Version 4.1.0-M0, <= 4.1.2 is affected.