CVE-2026-87785 Apache Syncope: JWT subject spoofing
Attackers can spoof user privileges and bypass authentication if internal JWT settings are disclosed, requiring an upgrade to secure Apache Syncope.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-87785?
CVE-2026-87785 is a critical authentication bypass vulnerability in Apache Syncope, published on 14 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-290
Which versions are affected by CVE-2026-87785?
How do I fix CVE-2026-87785?
No fix has been published for CVE-2026-87785 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-87785 being exploited?
There is no known exploitation of CVE-2026-87785 in the wild and no public exploit code.
Sources
Also known as GHSA-v8g7-44pf-w6m4.