CVE-2026-27537Network attack vector

Visitor-browser script execution

Published Aug 13, 2026 · Updated Aug 13, 2026

Cross-site scripting in Smart Popup by Supsystic 1.11.2 and earlier allows remote attackers to execute script in a visitor's browser. The public CVE record and upstream changelog identify the subscription confirmation page, but neither discloses the attacker-controlled input, browser sink, or failed neutralization operation. Exploitation requires a visitor to interact with attacker-controlled content; the resulting script runs in that visitor's browser context, and the CNA record conflicts on whether attacker privileges are required.

CVSS severity6.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Smart Popup by Supsystic 1.11.2 and earlier allows remote attackers to execute script in a visitor's browser. The public CVE record and upstream changelog identify the subscription confirmation page, but neither discloses the attacker-controlled input, browser sink, or failed neutralization operation. Exploitation requires a visitor to interact with attacker-controlled content; the resulting script runs in that visitor's browser context, and the CNA record conflicts on whether attacker privileges are required.

The record

CVE
CVE-2026-27537
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Supsystic
Product
Smart Popup by Supsystic
Classifications
CWE-79, CAPEC-588, T1059.007
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 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=n/a <=1.11.2 changes=[{"at":"1.12.0","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Supsystic · Smart Popup by Supsysticversion=n/a <=1.11.2 changes=[{"at":"1.12.0","status":"unaffected"}]

Published CVSS scores

6.5PatchstackCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-588DOM-Based XSS
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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

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Your stack

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