CVE-2026-89427Network attack vector

Reflected XSS via unescaped search-title placeholders

Published Oct 1, 2026 · Updated Oct 1, 2026

Reflected XSS in Spacetime Ad Inserter 2.8.18 and earlier allows remote attackers to run script in a visitor's browser via a crafted search link. On search pages, an enabled ad block using {title} or {short-title} places the insufficiently escaped s search parameter into rendered content. Exploitation requires that an administrator configure such a block for search pages and that a visitor follow the crafted link; script execution is limited to the affected site's browser origin.

CVSS severityUnavailable
Unscored
EPSS probability0.25%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Reflected XSS in Spacetime Ad Inserter 2.8.18 and earlier allows remote attackers to run script in a visitor's browser via a crafted search link. On search pages, an enabled ad block using {title} or {short-title} places the insufficiently escaped s search parameter into rendered content. Exploitation requires that an administrator configure such a block for search pages and that a visitor follow the crafted link; script execution is limited to the affected site's browser origin.

The record

CVE
CVE-2026-89427
Published
Oct 1, 2026
Updated
Oct 1, 2026
Vendor
Spacetime
Product
Ad Inserter
Classifications
T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.8.18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Spacetime · Ad Inserterversion=0 <=2.8.18

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1204.001User Execution: Malicious Link

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started