Vulnerability · Published Oct 20, 2026 · Assigned by NCSC.ch
CVE-2026-14933Unblu Spark Cross-Site Scripting in Embedded Co-Browsing
High 8.6
In plain English
A high-severity cross-site scripting in Unblu Spark from Unblu inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Unblu inc. | Unblu Spark | 7.0 – through 7.57.78.0 – through 8.39.2 |
Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
References
- Unblu Security Advisories vendor-advisory