CVE-2026-66256 Deserialization in Apache Shindig Common
Attackers with REST API access can trigger arbitrary code execution via unsafe deserialization in the retired Apache Shindig server.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-66256?
CVE-2026-66256 is a high-severity unsafe deserialization vulnerability in Apache Shindig Common, published on 13 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
** 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.
Weakness: CWE-502
Which versions are affected by CVE-2026-66256?
It affects 1 product.
Products include Apache Shindig.
How do I fix CVE-2026-66256?
No fix has been published for CVE-2026-66256 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-66256 being exploited?
There is no known exploitation of CVE-2026-66256 in the wild and no public exploit code.
Other vulnerabilities in Apache Shindig Common
Sources
Also known as GHSA-pwr8-4vxm-3h37.