What is the CVSS score of EUVD-2026-57918?

EUVD-2026-57918 has a CVSS 3.1 base score of 7.2 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.5%.

Which versions of Apache Shindig are affected by EUVD-2026-57918?

Apache Shindig, a retired open-source project, contains a remote code execution vulnerability with no vendor fix planned.

How to fix or mitigate EUVD-2026-57918?

Within 24 hours, audit all systems running Apache Shindig to determine active usage and criticality. Over the next 7 days, implement network segmentation to restrict Shindig API access to only authorized services and users, and audit all accounts with high-privilege API credentials. Within 30 days, document a decommissioning or replacement plan for all Shindig instances, prioritizing production systems, and begin execution.

Apache Shindig EUVD-2026-57918

| CVE-2026-66256 HIGH

Deserialization of Untrusted Data (CWE-502)

2026-08-13 apache

GHSA-pwr8-4vxm-3h37

RCE Apache Deserialization Apache Shindig Common Apache Shindig Social Api Apache Software Foundation

7.2

CVSS 3.1 · Vendor: apache

Severity by source

Vendor (apache) PRIMARY

7.2 HIGH

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

vuln.today AI

7.2 HIGH

Network-reachable REST API with no complexity; PR:H confirmed by description requiring privileged API user; full RCE yields C:H/I:H/A:H with no scope change.

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

4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Updated

Aug 13, 2026 - 16:29 vuln.today

v2 (cvss_changed)

Re-analysis Queued

Aug 13, 2026 - 16:22 vuln.today

cvss_changed

CVSS changed

Aug 13, 2026 - 16:22 NVD

7.2 (HIGH)

Analysis Generated

Aug 13, 2026 - 15:06 vuln.today

CVE Published

Aug 13, 2026 - 13:53 cve.org

HIGH

DescriptionCVE.org

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.

Articles & Coverage 1

News 3 New Apache Vulnerabilities - 1 Critical, 2 High, 1 With POC Aug 14, 2026

AnalysisAI

Remote code execution in Apache Shindig (all versions) is reachable via the project's REST API, where deserialization of attacker-controlled input allows server-side arbitrary code execution. The vulnerability requires high-privilege API access (CVSS PR:H), limiting opportunistic exploitation, but every deployed instance is permanently exposed because the Apache Software Foundation has retired the project and will not release a fix. No public exploit or KEV listing has been identified at time of analysis, but the combination of RCE impact and no-patch status makes any continued deployment a long-term liability.

Technical ContextAI

Apache Shindig was an open-source Java implementation of the OpenSocial specification, providing gadget rendering and a REST/RPC Social API. The root cause is CWE-502 (Deserialization of Untrusted Data): Java object deserialization in the REST API endpoint processes attacker-supplied serialized payloads without adequate type validation, enabling gadget-chain-based code execution - a class of flaw well-documented in Java frameworks since 2015. Affected CPEs span all released versions of both apache_software_foundation:apache_shindig_common and apache_software_foundation:apache_shindig_social-api (cpe:2.3:a:apache_software_foundation:apache_shindig_common:*:*:*:*:*:*:*:* and cpe:2.3:a:apache_software_foundation:apache_shindig_social-api:*:*:*:*:*:*:*:*). The project's retired status means no backport or security branch will be maintained.

RemediationAI

No vendor-released patch is available and none is planned - the Apache Software Foundation has explicitly stated it will not fix this issue due to project retirement. The primary recommended action is to migrate off Apache Shindig entirely and adopt a supported alternative for OpenSocial or social gadget functionality. If immediate migration is not feasible, restrict all network access to the Shindig REST API endpoint to a minimal set of explicitly trusted internal hosts using firewall rules or a reverse proxy ACL; this reduces the attack surface but does not eliminate the vulnerability and requires ongoing access-list management. Additionally, enforce the principle of least privilege on API credentials: audit which accounts hold high-privilege REST API access and revoke any that are not operationally required, since exploitation depends on PR:H credentials. Do not expose the Shindig instance to the public internet under any circumstances. The Apache advisory is at https://lists.apache.org/thread/opgpnhk149614gx6vcy3lvyjnycw8mkh.