CVE-2026-21768 Overview
CVE-2026-21768 affects the compose-rich-editor library version 1.0.0-rc14 used in HCL Verse for Android. The library handles rich text email composition and fails to properly validate all HTML input. Attackers can leverage this gap to execute malicious content under specific conditions. The flaw is tracked under [CWE-20: Improper Input Validation] and impacts confidentiality and integrity on the affected device.
Critical Impact
Successful exploitation allows malicious HTML content to be executed within the email composition context, potentially exposing sensitive user data and corrupting message integrity on the Android device.
Affected Products
- HCL Verse for Android (using compose-rich-editor v1.0.0-rc14)
- compose-rich-editor library version 1.0.0-rc14
- Rich text email composition component within HCL Verse
Discovery Timeline
- 2026-06-19 - CVE-2026-21768 published to NVD
- 2026-06-22 - Last updated in NVD database
Technical Details for CVE-2026-21768
Vulnerability Analysis
The vulnerability resides in the rich text email composition workflow of HCL Verse for Android. The compose-rich-editor library accepts HTML input when users compose or render rich text messages. The library does not enforce complete validation across all supported HTML constructs. Crafted HTML payloads bypass the partial validation logic and reach the rendering layer.
Exploitation requires local access and user interaction. An attacker must convince the victim to open or interact with content containing the malicious HTML in the rich text composer. The attack complexity is rated high, reflecting the need for specific conditions to trigger code execution paths within the editor.
Root Cause
The root cause is improper input validation [CWE-20] within the compose-rich-editor library. The HTML sanitization routine does not cover the full set of dangerous tag and attribute combinations. Unfiltered constructs survive validation and reach the renderer, where they trigger unintended behavior during email composition.
Attack Vector
An attacker delivers crafted HTML content to a user of HCL Verse for Android. The user must interact with the content inside the rich text composer for the unvalidated HTML to be processed. Once processed, the malicious content executes within the application context, allowing the attacker to compromise confidentiality and integrity of in-app data. Network access is not required; the vector is local with user interaction.
The vulnerability mechanism is described in the HCL Software Knowledge Base Article. No public proof-of-concept code has been released.
Detection Methods for CVE-2026-21768
Indicators of Compromise
- Inbound emails to HCL Verse for Android containing unusual or obfuscated HTML structures inside rich text bodies.
- Unexpected rendering errors or crashes inside the HCL Verse composer after opening a message.
- Anomalous outbound network connections originating from the HCL Verse process following email interaction.
Detection Strategies
- Inspect email gateway logs for messages containing HTML payloads with embedded scripts, unusual attributes, or malformed tags targeting Android mail clients.
- Monitor mobile device management (MDM) telemetry for HCL Verse versions running the vulnerable compose-rich-editor library build.
- Correlate email open events with subsequent unexpected process or network activity on Android endpoints.
Monitoring Recommendations
- Enable verbose logging on email security gateways to capture HTML content metadata for messages routed to HCL Verse users.
- Track the installed version of HCL Verse for Android across the fleet and alert on outdated builds.
- Forward mobile endpoint telemetry to a centralized analytics platform for cross-source correlation with email threat intelligence.
How to Mitigate CVE-2026-21768
Immediate Actions Required
- Identify all devices running HCL Verse for Android and inventory the embedded compose-rich-editor version.
- Apply the vendor-provided update referenced in the HCL Software Knowledge Base Article.
- Instruct users to avoid opening rich text emails from untrusted senders until the patch is deployed.
Patch Information
HCL has published remediation guidance in HCL Knowledge Base Article KB0130866. Administrators should consult the article for the fixed version of HCL Verse for Android and upgrade affected installations through their standard mobile application distribution channels.
Workarounds
- Restrict HCL Verse for Android usage to plain text email rendering where the deployment allows configuration of composer modes.
- Block or quarantine inbound email containing complex HTML structures at the secure email gateway for at-risk users.
- Enforce MDM policies that prevent the installation of vulnerable HCL Verse builds and require the patched release.
# Example MDM compliance check for HCL Verse version
adb shell dumpsys package com.hcl.verse | grep versionName
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
