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Back to active CVEs
Medium · CVSS 8.7CVE-2026-77811

Stored Cross-Site Scripting via Integration Template Asset in OpenSearch DashboardsCVE-2026-77811

Answer in brief

CVE-2026-77811 records a Medium severity (CVSS 8.7) vulnerability in Stored Cross-Site Scripting via Integration Template Asset in OpenSearch Dashboards. The current sources do not mark it as known exploited. The current feed maps OpenSearch/OpenSearch Dashboards dashboards-observability plugin (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 21, 2026Updated Aug 27, 2026Source checked Oct 6, 2026First seen by HOL Aug 21, 2026Material review Aug 27, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 8.7
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps OpenSearch/OpenSearch Dashboards dashboards-observability plugin (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
OpenSearch/OpenSearch Dashboards dashboards-observability plugingeneric>=0 <3.4 || >=0 <2.19.63.4, 2.19.6

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for OpenSearch/OpenSearch Dashboards dashboards-observability plugin.
  2. 2Review the reported fix. Update OpenSearch/OpenSearch Dashboards dashboards-observability plugin to 3.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Aug 21, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 27, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 21, 2026

Sources and claim methodology

  • Source referenceaws.amazon.com
  • GitHub security advisorygithub.com
  • Source referenceopensearch.org
  • Source referenceopensearch.org
  • Source referenceopensearch.org
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • SourceCodester Drug Recommendation System add_drug.php cross site scriptingAlso CWE-79
  • imgproxy SVG svg.go sanitizeElement cross site scriptingAlso CWE-79
  • Joplin whiteboard card rendering allows CSS injection into application chromeAlso CWE-79
  • WordPress Real 3D FlipBook plugin <= 5.5 - Cross Site Scripting (XSS) vulnerabilityAlso CWE-79
  • Post SMTP <= 4.0.1 - Unauthenticated Stored DOM-Based Cross-Site Scripting via 'user_email' Parameter (Multisite Registration → Failed Email Log)Also CWE-79
  • Sssd: sssd: denial of service via memory exhaustion in autofs responderSame generic ecosystem

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Oct 6, 2026
References
5 linked sources
Open source record