---
title: "CVE-2026-14933: Unblu inc. Unblu Spark - Stored XSS"
description: "Unblu inc. Unblu Spark 7.0 through 7.57.7 and 8.0 through 8.39.2 contain a stored XSS caused by improper sanitization of co-browsed page content in the embedded co-browsing feature, letting unauthenticated remote attackers in visitor role execute arbitrary JavaScript in agent's browser, exploit requires agent to join attacker's co-browsing session."
url: https://panop.io/threat-heartbeat/CVE-2026-14933/
---

# CVE-2026-14933 Unblu inc. Unblu Spark - Stored XSS

Unblu inc. Unblu Spark 7.0 through 7.57.7 and 8.0 through 8.39.2 contain a stored XSS caused by improper sanitization of co-browsed page content in the embedded co-browsing feature, letting unauthenticated remote attackers in visitor role execute arbitrary JavaScript in agent's browser, exploit requires agent to join attacker's co-browsing session.

CVSS base score 8.6 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-14933)

## Details

Type

Stored XSS

Impact

Client Script Exec

CVSS 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/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

Published

20 October 2026

Updated

20 October 2026

Weakness

[CWE-79](https://cwe.mitre.org/data/definitions/79.html)

## Vendor fix

Update to the latest version beyond 8.39.2 or apply vendor patches addressing this issue.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-14933](https://nvd.nist.gov/vuln/detail/CVE-2026-14933)
- [https://docs.unblu.com/latest/security-bulletins/#UBL-2026-004](https://docs.unblu.com/latest/security-bulletins/#UBL-2026-004)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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