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CVE-2026-77181: Apache Syncope: ClientApp update entitlement not effective

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-09-14
• Weakness: CWE-863

Description

Incorrect Authorization vulnerability in Apache Syncope. An administrator with ClientApp's update entitlement is unable to perform the related operation, while ClientApp's create entitlement is checked both for create and update operations on ClientApp. 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.

Affected products

• Apache Software Foundation 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

References

• https://lists.apache.org/thread/swqj31jhbz7hmmkjy42461zp9rhh9lwy
• http://www.openwall.com/lists/oss-security/2026/09/14/16

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