Vulnerability-Lookup

CVE-2026-77811 (GCVE-0-2026-77811)

Vulnerability from cvelistv5 – Published: 2026-08-21 20:09 – Updated: 2026-08-27 16:46

Title

Stored Cross-Site Scripting via Integration Template Asset in OpenSearch Dashboards

Summary

Improper input validation in the dashboards-observability plugin in OpenSearch Dashboards allows a remote authenticated user with write permissions to OpenSearch Dashboards saved objects to execute arbitrary JavaScript in the context of other users' browser sessions by uploading a saved asset with arbitrary web content.

Severity

8.7 (High)


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

6.2 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-27 16:09 UTC

CWE

CWE-79 - Improper neutralization of input during web page generation ('cross-site scripting')

Assigner

AMZN mitre root

References

4 references

URL	Tags
https://opensearch.org/artifacts/by-version/#rele…	patch
https://opensearch.org/artifacts/by-version/#rele…	patch
https://aws.amazon.com/security/security-bulletin…	vendor-advisory
https://github.com/opensearch-project/dashboards-…	third-party-advisory

Impacted products

2 products

Vendor	Product	Version	CPE status
AWS	Amazon OpenSearch Service	Unaffected: 0 , < 3.3 (custom)	guessed
OpenSearch	OpenSearch Dashboards dashboards-observability plugin	Affected: 0 , < 3.4 (custom) Affected: 0 , < 2.19.6 (custom) cpe:2.3:a:opensearch:opensearch_dashboards_dashboards-observability_plugin:::::::: cpe:2.3:a:opensearch:opensearch_dashboards_dashboards-observability_plugin::::::::

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-77811

Vulnerability from fkie_nvd - Published: 2026-08-21 21:17 - Updated: 2026-08-27 20:18

Severity

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

Summary

References

	URL	Tags
	ff89ba41-3aa1-4d27-914a-91399e9639e5	https://aws.amazon.com/security/security-bulletins/2026-088-aws/
	ff89ba41-3aa1-4d27-914a-91399e9639e5	https://github.com/opensearch-project/dashboards-observability/security/advisories/GHSA-rmqx-r3wm-3px5
	ff89ba41-3aa1-4d27-914a-91399e9639e5	https://opensearch.org/artifacts/by-version/#release-2-19-6
	ff89ba41-3aa1-4d27-914a-91399e9639e5	https://opensearch.org/artifacts/by-version/#release-3-4-0

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "lastModified": "2026-08-27T20:18:39.860",
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          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.2,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "HIGH",
          "subIntegrityImpact": "HIGH",
          "userInteraction": "ACTIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-77811",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-27T16:09:33.916893Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-21T21:17:08.903",
  "references": [
    {
      "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
      "url": "https://aws.amazon.com/security/security-bulletins/2026-088-aws/"
    },
    {
      "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
      "url": "https://github.com/opensearch-project/dashboards-observability/security/advisories/GHSA-rmqx-r3wm-3px5"
    },
    {
      "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
      "url": "https://opensearch.org/artifacts/by-version/#release-2-19-6"
    },
    {
      "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
      "url": "https://opensearch.org/artifacts/by-version/#release-3-4-0"
    }
  ],
  "sourceIdentifier": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
      "type": "Secondary"
    }
  ]
}

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.

Detection rules are retrieved from Rulezet.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.