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Vulnerability record · CVE-2026-87785 · published 14 September 2026

CVE-2026-87785: Authentication bypass by spoofing vulnerability

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.

9.1 CVSS 3.1 Critical EPSS 0.55% · top 56.3% CWE-290 · Authentication bypass by spoofing Deferred
9.1CVSS 3.1 base score
0.55%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
14 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

LinkTags
https://lists.apache.org/thread/3t3om8mny7ng52q053pdzpmtdtosnqoo
http://www.openwall.com/lists/oss-security/2026/09/14/24

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Source: NIST National Vulnerability Database (record CVE-2026-87785), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.