CVE-2026-77811

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 69% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity87% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

August 21, 2026

Last Modified

August 27, 2026

Advisory Details (4)

Auto-updated Aug 21, 2026
Patch available. Sources: github.
github Patch Available

Stored XSS via Integration Template Asset · Advisory · opensearch-project/dashboards-observability · GitHub

https://github.com/opensearch-project/dashboards-observability/security/advisories/GHSA-rmqx-r3wm-3px5
generic

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

https://aws.amazon.com/security/security-bulletins/2026-088-aws/
generic

Artifacts By Version - OpenSearch

https://opensearch.org/artifacts/by-version/#release-2-19-0
generic

Artifacts By Version - OpenSearch

https://opensearch.org/artifacts/by-version/#release-3-4-0

Vendor Advisories for CVE-2026-77811(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 53× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-18 21:37 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-17 21:16 UTCEG score recompute
  4. 2026-09-16 19:41 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 06:48 UTCEG score recompute
  7. 2026-09-16 05:15 UTCEPSS rescore
  8. 2026-09-15 07:56 UTCEG score recompute
  9. 2026-09-15 03:12 UTCEPSS rescore
  10. 2026-09-15 03:12 UTCEPSS rescore
  11. 2026-09-13 21:35 UTCEG score recompute
  12. 2026-09-12 22:43 UTCEG score recompute
  13. 2026-09-11 23:32 UTCEG score recompute
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-11 12:06 UTCEG score recompute
  16. 2026-09-10 12:12 UTCEG score recompute
  17. 2026-09-10 09:35 UTCEPSS rescore
  18. 2026-09-09 01:45 UTCEG score recompute
  19. 2026-09-08 22:01 UTCEPSS rescore
  20. 2026-09-07 22:29 UTCEG score recompute
  21. 2026-09-06 23:22 UTCEG score recompute
  22. 2026-09-06 13:48 UTCEPSS rescore
  23. 2026-09-06 00:29 UTCEG score recompute
  24. 2026-09-04 14:12 UTCEG score recompute
  25. 2026-09-04 05:07 UTCEPSS rescore
Show 28 more
  1. 2026-09-02 16:21 UTCEG score recompute
  2. 2026-09-02 14:12 UTCEPSS rescore
  3. 2026-09-01 17:25 UTCEG score recompute
  4. 2026-09-01 13:54 UTCEPSS rescore
  5. 2026-09-01 05:57 UTCEG score recompute
  6. 2026-09-01 04:40 UTCEPSS rescore
  7. 2026-09-01 04:40 UTCEPSS rescore
  8. 2026-08-31 04:40 UTCEG score recompute
  9. 2026-08-30 19:18 UTCEPSS rescore
  10. 2026-08-30 19:17 UTCEPSS rescore
  11. 2026-08-30 05:48 UTCEG score recompute
  12. 2026-08-30 01:22 UTCEPSS rescore
  13. 2026-08-29 06:53 UTCEG score recompute
  14. 2026-08-28 21:42 UTCEPSS rescore
  15. 2026-08-28 07:50 UTCEG score recompute
  16. 2026-08-27 20:20 UTCEG score recompute
  17. 2026-08-27 14:25 UTCEPSS rescore
  18. 2026-08-27 02:02 UTCEG score recompute
  19. 2026-08-26 14:47 UTCEPSS rescore
  20. 2026-08-25 15:39 UTCEG score recompute
  21. 2026-08-25 13:49 UTCEPSS rescore
  22. 2026-08-24 16:48 UTCEG score recompute
  23. 2026-08-24 14:18 UTCEPSS rescore
  24. 2026-08-23 07:42 UTCEG score recompute
  25. 2026-08-23 00:19 UTCEPSS rescore
  26. 2026-08-21 21:24 UTCEG score recompute
  27. 2026-08-21 20:19 UTCEG score recompute
  28. 2026-08-21 20:19 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-77811?
CVE-2026-77811 is a high vulnerability published on August 21, 2026. 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…
When was CVE-2026-77811 disclosed?
CVE-2026-77811 was first published in the National Vulnerability Database on August 21, 2026, with the most recent update on August 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77811 actively exploited?
CVE-2026-77811 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 69.0% of all scored CVEs.
What is the CVSS score of CVE-2026-77811?
CVE-2026-77811 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-77811?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77811, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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