CVE-2026-30862

CriticalPublic PoC

Published: 10 March 2026

Published

10 March 2026

Modified

13 March 2026

KEV Added

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Patch

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CVSS Score 9.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

EPSS Score 0.0005 16.4th percentile

Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-30862 is a critical-severity Cross-site Scripting (CWE-79) vulnerability in Appsmith Appsmith. Its CVSS base score is 9.0 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 16.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-15 (Information Output Filtering).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-15 Information Output Filtering good match

prevent

SI-15 mandates filtering of output prior to rendering, directly addressing the lack of HTML sanitization in the TableWidgetV2 React component that allows malicious attributes to be interpolated into the DOM.

SI-10 Information Input Validation good match

prevent

SI-10 requires validation of all inputs to the system, preventing the storage of malicious XSS payloads via features like 'Invite Users' that could target administrators.

SI-2 Flaw Remediation good match

prevent

SI-2 ensures timely flaw remediation, including patching the specific sanitization vulnerability fixed in Appsmith version 1.96 to eliminate the stored XSS risk.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1185 Browser Session Hijacking Collection

Adversaries may take advantage of security vulnerabilities and inherent functionality in browser software to change content, modify user-behaviors, and intercept information as part of various browser session hijacking techniques.

attack.mitre.org →

Why these techniques?

Stored XSS in web app directly enables exploitation of accessible application (T1190) and hijacking of admin browser session to force privileged API execution (T1185).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

Appsmith is a platform to build admin panels, internal tools, and dashboards. Prior to 1.96, a Critical Stored XSS vulnerability exists in the Table Widget (TableWidgetV2). The root cause is a lack of HTML sanitization in the React component rendering…

pipeline, allowing malicious attributes to be interpolated into the DOM. By leveraging the "Invite Users" feature, an attacker with a regular user account (user@gmail.com) can force a System Administrator to execute a high-privileged API call (/api/v1/admin/env), resulting in a Full Administrative Account Takeover. This vulnerability is fixed in 1.96.

Deeper analysisAI

CVE-2026-30862 is a critical stored cross-site scripting (XSS) vulnerability, rated at CVSS 3.1 score of 9.0 (AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H) and mapped to CWE-79, affecting Appsmith versions prior to 1.96. Appsmith is a platform for building admin panels, internal tools, and dashboards. The issue resides in the Table Widget (TableWidgetV2), where a lack of HTML sanitization in the React component rendering pipeline allows malicious attributes to be interpolated into the DOM.

An attacker with a regular user account, such as user@gmail.com, can exploit this vulnerability by leveraging the "Invite Users" feature. This enables the attacker to force a System Administrator to execute a high-privileged API call to /api/v1/admin/env through a stored XSS payload, resulting in full administrative account takeover.

The official Appsmith security advisory (GHSA-5hw4-whxv-6794) confirms that the vulnerability is fixed in Appsmith version 1.96, recommending that users upgrade to this or later versions to mitigate the risk.