Incomplete List of Disallowed Inputs in Apache Syncope - CVE-2026-77883
Published: September 15, 2026
Vulnerability identifier: #VU149990
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-77883
CWE-ID: CWE-184
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to an incomplete denylist in the JexlContextBuilder when processing derived schema JEXL expressions. A remote privileged user can create a malicious JEXL expression to access sensitive LinkedAccount or Manager information.
The disclosed information can include hashed credentials.
Affected software
Apache Syncope
How to mitigate CVE-2026-77883
Install security update from vendor's website.
Apache Syncope - addressed in versions 4.0.8, 4.1.3