What is CVE-2026-66256?

CVE-2026-66256 is a high-severity vulnerability in Apache Software Foundation Shindig Common, classified under Deserialization of Untrusted Data. CVSS score: 7.2/10. Published 2026-08-13.

How severe is CVE-2026-66256?

High severity. CVSS v3 base score is 7.2 out of 10.

Deserialization in Apache Software Foundation Shindig Common

CVE-2026-66256

** UNSUPPORTED WHEN ASSIGNED ** Deserialization of Untrusted Data vulnerability in Apache Shindig. This issue affects Apache Shindig: all versions. Users with access to the Shindig REST API can send specially-crafted requests to trigger…

Vulnerability class: Insecure Deserialization

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

Apache Software Foundation Shindig Common — versions 0
Apache Software Foundation Shindig Social-api — versions 0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

security@apache.org (vendor-advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-66256?: CVE-2026-66256 is a high-severity vulnerability in Apache Software Foundation Shindig Common, classified under Deserialization of Untrusted Data. CVSS score: 7.2/10. Published 2026-08-13.
How severe is CVE-2026-66256?: High severity. CVSS v3 base score is 7.2 out of 10.