High · CVSS 8.6CVE-2026-14933

Unblu Spark Cross-Site Scripting in Embedded Co-BrowsingCVE-2026-14933

Answer in brief

CVE-2026-14933 records a High severity (CVSS 8.6) vulnerability in Unblu Spark Cross-Site Scripting in Embedded Co-Browsing. The current sources do not mark it as known exploited. The current feed maps Unblu inc./Unblu Spark (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 20, 2026Updated Oct 20, 2026Source checked Oct 20, 2026First seen by HOL Oct 20, 2026Material review Oct 20, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.6
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 8.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Unblu inc./Unblu Spark (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Unblu inc./Unblu Sparkgeneric	>=7.0 <=7.57.7 \|\| >=8.0 <=8.39.2	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Unblu inc./Unblu Spark.
Review the reported fix. Source-reported solution: Upgrade to Unblu Spark 8.39.3 or later, or 7.57.9 or later. The fix is also available in 8.35.2-hotfix.0, 8.37.2-hotfix.2, 8.38.2-hotfix.0 and later hotfixes of these release lines. Unblu Cloud customers needn't take any action. The fix is already deployed in Unblu Cloud. For a workaround for on-premises deployments that can't be upgraded immediately, see the security bulletin.

Evidence timeline and material changes

Published upstream
Oct 20, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 20, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 20, 2026

Sources and claim methodology

Source referencedocs.unblu.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.