Unblu Spark up to 8.39.2 Embedded Co-browsing Feature cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, was found in Unblu Spark up to 7.57.7/8.35.1/8.37.1/8.38.1/8.39.2. Affected by this vulnerability is an unknown functionality of the component Embedded Co-browsing Feature. Such manipulation leads to cross site scripting. This vulnerability is traded as CVE-2026-14933. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Unblu Spark up to 7.57.7/8.35.1/8.37.1/8.38.1/8.39.2. It has been rated as problematic. Affected by this issue is some unknown functionality of the component Embedded Co-browsing Feature. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. CVE summarizes:

Cross-site scripting in the embedded co-browsing feature in Unblu inc. Unblu Spark 7.0 through 7.57.7 and 8.0 through 8.39.2, on on-premises and cloud deployments, allows an unauthenticated remote attacker in the visitor role to execute arbitrary JavaScript in the browser of an agent taking part in the attacker's co-browsing session, via content of the co-browsed page that the agent's browser renders as HTML. The JavaScript runs in the context and under the identity of the agent's session in the Agent Desk or the Single Conversation Desk. Exploitation requires an agent to join an embedded co-browsing session with the attacker. Mobile co-apping isn't affected.

The advisory is available at docs.unblu.com. This vulnerability is handled as CVE-2026-14933 since 07/07/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 8.35.2, 8.37.2, 8.38.2 or 8.39.3 eliminates this vulnerability.

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Productinfo

Vendor

• Unblu

Name

• Spark

Version

• 7.57.0
• 7.57.1
• 7.57.2
• 7.57.3
• 7.57.4
• 7.57.5
• 7.57.6
• 7.57.7
• 8.35.0
• 8.35.1
• 8.37.0
• 8.37.1
• 8.38.0
• 8.38.1
• 8.39.0
• 8.39.1
• 8.39.2

CPE 2.3info

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CPE 2.2info

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