Apache Syncope: Console XXE on Keymaster parameters

CVE-2026-23795 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

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.

Basic information

Type
reviewed
Severity
medium
Advisory on GitHub
Open advisory ↗
Repository advisory
—
Source code
Browse source ↗
Published (advisory)
2026-02-03 18:30:44 UTC
Updated
2026-02-03 19:53:41 UTC
GitHub reviewed
2026-02-03 19:53:38 UTC
NVD published
2026-02-03

EPSS Score

Score Percentile
0.10% 27.88%

CVSS Scores

Base score Version Severity Vector
4.9 3.1 —
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.

Identifiers

Type Value
GHSA GHSA-73f3-rqqf-2j54 ↗
CVE CVE-2026-23795 ↗

CWEs

CWE id Name
CWE-611 Improper Restriction of XML External Entity Reference

Affected packages (2)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
maven org.apache.syncope.client.idrepo:syncope-client-idrepo-console >= 3.0.0, < 3.0.16 3.0.16 —
maven org.apache.syncope.client.idrepo:syncope-client-idrepo-console >= 4.0.0, < 4.0.4 4.0.4 —

References

cvelogic Threat Intelligence