CVE-2026-18481 - Stored XSS in Participant URL Field leads to Account Takeover via Session Token Theft
Bulletin ID: 2026-085-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 08/20/2026 13:30 PM PDT Description: Improper input validation in the Time Series Visual Builder (TSVB) plugin in OpenSearch Dashboards before 3.8 allows a remote authenticated user with standard data access permissions to execute arbitrary code on the server by sending a crafted JSON payload to the metrics visualization API endpoint. To mitigate this issue, users should upgrade to OpenSearch Dashboards 3.8 or later. Impacted products and versions: - OpenSearch-Dashboards (open-source, self-managed): >=3.0.0, =3.0.0, <3.8.0 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.
AI Analysis
Technical Summary
This vulnerability, CVE-2026-18420, concerns a remote code execution (RCE) vector through prototype pollution in the OpenSearch Dashboards TSVB Plugin. Prototype pollution vulnerabilities typically allow attackers to manipulate object prototypes, potentially leading to arbitrary code execution. However, the provided data does not include explicit technical details, affected versions, or confirmed remediation steps for this specific CVE. The AWS Security Bulletin referenced does not contain detailed information about this vulnerability in the provided excerpt.
Potential Impact
The impact is potentially severe as remote code execution vulnerabilities can allow attackers to execute arbitrary code on affected systems. However, no specific impact details, exploitation status, or affected environments are provided in the input data. There is no indication of known exploits in the wild or cloud service implications.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or workaround information is provided, users should monitor the official AWS Security Bulletin and OpenSearch project advisories for updates. Until a fix is available, consider limiting access to the affected plugin and monitoring for suspicious activity related to prototype pollution vectors.
CVE-2026-18481 - Stored XSS in Participant URL Field leads to Account Takeover via Session Token Theft
Description
Bulletin ID: 2026-085-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 08/20/2026 13:30 PM PDT Description: Improper input validation in the Time Series Visual Builder (TSVB) plugin in OpenSearch Dashboards before 3.8 allows a remote authenticated user with standard data access permissions to execute arbitrary code on the server by sending a crafted JSON payload to the metrics visualization API endpoint. To mitigate this issue, users should upgrade to OpenSearch Dashboards 3.8 or later. Impacted products and versions: - OpenSearch-Dashboards (open-source, self-managed): >=3.0.0, =3.0.0, <3.8.0 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, CVE-2026-18420, concerns a remote code execution (RCE) vector through prototype pollution in the OpenSearch Dashboards TSVB Plugin. Prototype pollution vulnerabilities typically allow attackers to manipulate object prototypes, potentially leading to arbitrary code execution. However, the provided data does not include explicit technical details, affected versions, or confirmed remediation steps for this specific CVE. The AWS Security Bulletin referenced does not contain detailed information about this vulnerability in the provided excerpt.
Potential Impact
The impact is potentially severe as remote code execution vulnerabilities can allow attackers to execute arbitrary code on affected systems. However, no specific impact details, exploitation status, or affected environments are provided in the input data. There is no indication of known exploits in the wild or cloud service implications.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or workaround information is provided, users should monitor the official AWS Security Bulletin and OpenSearch project advisories for updates. Until a fix is available, consider limiting access to the affected plugin and monitoring for suspicious activity related to prototype pollution vectors.
Technical Details
- Article Source
- {"url":"https://aws.amazon.com/security/security-bulletins/rss/2026-068-aws/","fetched":true,"fetchedAt":"2026-07-31T19:31:31.794Z","wordCount":308}
- Classification
- {"confidence":0.95,"severitySource":"heuristic","classifier":"rss-v2"}
Threat ID: 6a6cf814bf32cb7a342b73cc
Added to database: 07/31/2026, 19:31:32 UTC
Last enriched: 08/15/2026, 18:31:53 UTC
Last updated: 09/14/2026, 15:20:58 UTC
Views: 245
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