Vulnerability-Lookup

CVE-2026-66256 (GCVE-0-2026-66256)

Vulnerability from cvelistv5 – Published: 2026-08-13 13:53 – Updated: 2026-08-13 16:18 Unsupported When Assigned

Title

Apache Shindig Common, Apache Shindig Social-Api: Remote Code Execution via XStream deserialization (OpenSocial REST API)

Summary

** 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.

Severity

7.2 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-13 15:53 UTC

CWE

CWE-502 - Deserialization of Untrusted Data

Assigner

apache CNA under the mitre root

CNA scorecard B 76/100 over 1086 records in the last 180 days details

References

2 references

URL	Tags
https://lists.apache.org/thread/opgpnhk149614gx6v…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/08/13/7

Impacted products

2 products

Vendor	Product	Version	CPE status
Apache Software Foundation	Apache Shindig Common	Affected: 0 , ≤ * (semver)	guessed
Apache Software Foundation	Apache Shindig Social-Api	Affected: 0 , ≤ * (semver)	guessed

Credits

Daryle Bourque, Horizon3.ai Noah King, Horizon3.ai

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-66256

Vulnerability from fkie_nvd - Published: 2026-08-13 15:19 - Updated: 2026-09-11 13:53

Severity

7.2 (High) - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security@apache.org	https://lists.apache.org/thread/opgpnhk149614gx6vcy3lvyjnycw8mkh	Mailing List, Vendor Advisory
	af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/08/13/7	Mailing List, Third Party Advisory

Impacted products

	Vendor	Product	Version
	apache	shindig	*

JSON

To clipboard

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      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2026/08/13/7"
    }
  ],
  "sourceIdentifier": "security@apache.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-502"
        }
      ],
      "source": "security@apache.org",
      "type": "Secondary"
    }
  ]
}

GHSA-PWR8-4VXM-3H37

Vulnerability from github – Published: 2026-08-13 15:34 – Updated: 2026-08-13 18:31

Details

** 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.

Severity

7.2 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-66256"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-13T15:19:56Z",
    "severity": "HIGH"
  },
  "details": "** UNSUPPORTED WHEN ASSIGNED ** Deserialization of Untrusted Data vulnerability in Apache Shindig.\n\nThis issue affects Apache Shindig: all versions.\n\nUsers with access to the Shindig REST API can send specially-crafted requests to trigger arbitrary code execution on the server.\n\nAs 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.\n\nNOTE: This vulnerability only affects products that are no longer supported by the maintainer.",
  "id": "GHSA-pwr8-4vxm-3h37",
  "modified": "2026-08-13T18:31:37Z",
  "published": "2026-08-13T15:34:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-66256"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/opgpnhk149614gx6vcy3lvyjnycw8mkh"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/08/13/7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-66256 (GCVE-0-2026-66256)

FKIE_CVE-2026-66256

GHSA-PWR8-4VXM-3H37

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