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CVE-2025-66486: Medium Vulnerability in IBM Aspera Shares

A medium-severity HTML injection vulnerability in IBM Aspera Shares could allow remote attackers to execute malicious code in a victim's browser. Organizations should address this vulnerability to protect their systems.

MEDIUMCVSS 4.8 · Published April 1, 2026

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IBM Aspera Shares versions 1.9.9 through 1.11.0 are vulnerable to an HTML injection vulnerability. This vulnerability allows a remote attacker to inject malicious HTML code, which, when viewed by a victim, will be executed in the security context of the hosting site. The CVSS score for this vulnerability is 4.8, indicating a medium severity level.

The exploitation of this vulnerability could lead to significant risk for organizations, as it may allow attackers to manipulate the victim's web browser, potentially stealing sensitive data or performing actions on behalf of the user.

Given the potential impact of this vulnerability, organizations should prioritize patching to mitigate risks associated with HTML injection attacks effectively.

As of now, there are no known exploits or proof of concept available for this vulnerability, but the risk remains due to its nature.

Vulnerability Details

According to the analysis, the vulnerability falls under CWE-80, which relates to improper neutralization of input during web page generation ('HTML injection'). The primary source of this information is IBM's PSIRT.

The official description notes that an attacker with high privileges can inject HTML code that can be executed in the victim's browser context. The attack vector is classified as NETWORK, and the attack complexity is low, requiring user interaction to trigger the vulnerability.

Technical Analysis

The root cause of the vulnerability stems from improper input validation and output encoding, which allows malicious HTML to be injected. The attack vector is network-based, which means an attacker does not need physical access to the system; instead, they can exploit it remotely.

Attack complexity is low, requiring only that the victim visit a specially crafted web page. Privileges required are high, meaning that an attacker must have authenticated access to the application, and user interaction is necessary to exploit the vulnerability.

Risk & Impact Analysis

Risk to organizations includes the potential for unauthorized actions performed in the victim's context, which can lead to data breaches or unauthorized access to sensitive information. The confidentiality and integrity impacts are both rated as low, while availability is not affected.

Organizations should assess the urgency based on the CVSS score and the potential for exploitation, as well as consider their exposure to this vulnerability in their environment. Given the current analysis, organizations should address this vulnerability in their priority patch cycle.

Exploitation Status

Signal

Status

Known Exploit

No

Public PoC

No

Actively Exploited

No

Ransomware Use

No

Affected Versions

The vulnerable versions of IBM Aspera Shares are from 1.9.9 up to, but not including, 1.11.1. Organizations running these versions should review their systems and apply the necessary patches.

Mitigation & Remediation

Organizations should prioritize patching to mitigate this vulnerability. IBM recommends upgrading to version 1.11.1 or later to eliminate the risk. If immediate patching is not possible, organizations should consider implementing web application firewalls and monitoring for suspicious activity as interim measures.

Detection Guidance

Organizations should monitor logs for any unauthorized access attempts, particularly those related to HTML injection vectors. Behavioral anomalies and unexpected changes in user interaction should also be flagged for further investigation.

AppSecure Threat Intelligence Insight

The long-term significance of this vulnerability lies in its potential to expose organizations to various attack vectors, especially as malicious actors increasingly target web applications. Security teams should learn from this incident to enhance their defense strategies and prioritize regular security assessments.

To effectively address the risks associated with application vulnerabilities, organizations should implement a comprehensive penetration testing program. This will help identify weaknesses before they can be exploited.

Furthermore, the use of security training and awareness programs will help reduce the risk of user interaction vulnerabilities that rely on social engineering tactics.

Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.

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