Deserialization in Apache Shindig
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 arbitrary code execution on the server. As this project is retired, we do not plan to release a version that fixes this issue. Users are recommended to find an alternative or restrict access to the instance to trusted users. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.
Vulnerability class: Insecure Deserialization
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.009 (59.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.009 · change: +0.004
Affected products
- Apache Shindig
- Apache Software Foundation Shindig Common — versions 0
- Apache Software Foundation Shindig Social-Api — versions 0
Weakness classification (CWE)
References
- lists.apache.org/thread/opgpnhk149614gx6vcy3lvyjnycw8mkh (vendor-advisory, Mailing List, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-66256?
- CVE-2026-66256 is a high-severity vulnerability in Apache Shindig, 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.