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9.1

Apache Syncope lets attackers forge login tokens

CVE-2026-87785 · published 11 days ago
Summary

If the system’s token settings are exposed, a malicious user can create a fake token that looks like it belongs to another employee, letting them act with that person’s privileges after they log in. This affects Apache Syncope versions from 3.0.0‑M0 up to 4.1.2. Upgrade to Apache Syncope 4.0.8 or 4.1.3 to close the gap.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
apache software foundation apache syncope <= 3.0.16
Original advisory text
Authentication bypass by spoofing vulnerability in Apache Syncope. When the configured JWKS settings for internal JWT authentication are disclosed (at least protocol and key), an attacker can sp...
Authentication bypass by spoofing vulnerability in Apache Syncope.



When the configured JWKS settings for internal JWT authentication are disclosed (at least protocol and key), an attacker can spoof another user's privileges after completing a successful authentication and obtaining a valid JWT.

This issue affects Apache Syncope: from 3.0.0-M0 through 3.0.16, from 4.0.0-M0 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.
References
Severity
9.1 Critical
Exploitation
EPSS <1%
Type
CWE-290Authentication Bypass by Spoofing
Timeline
Published14 Sep 2026
Updated25 Sep 2026
First seen14 Sep 2026
Sources
CVE-2026-87785 · NVD
CVE-2026-87785 · MITRE
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