CVE-2026-14933
8.6HighPublished 20 Oct 2026 · NVD status: Received · AI triage by gemini-3.8-flash
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Passive
- Impact
- High impact on confidentiality, integrity
- Weakness
- CWE-79
Impact
An unauthenticated remote attacker can execute arbitrary JavaScript in an agent's browser session, hijacking their Agent Desk identity. To trigger it, an agent must join an embedded co-browsing session initiated by the attacker.
Root cause
The embedded co-browsing feature improperly sanitizes webpage content, causing the agent's browser to render attacker-controlled data directly as HTML.
Affected systems
Unblu Spark 7.0 through 7.57.7 and 8.0 through 8.39.2 (cloud and on-premises deployments).
CVSS v4.0 · 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Fix & remediation
Upgrade to Unblu Spark versions newer than 7.57.7 (for 7.x) or 8.39.2 (for 8.x) as specified in bulletin UBL-2026-004. As an interim workaround, disable the embedded co-browsing feature across agent desks until patching is complete.
AI-suggested. Run it in staging first and check it against the vendor advisory. Why?
NVD 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.