CVE-2026-13536Public exploitNetwork attack vector

Browser script execution via unencoded sn parameter

Published Jun 29, 2026 · Updated Jun 29, 2026

Reflected XSS in Pingbo Inc GotoHTTP 10.0 through 10.2 allows remote attackers to execute arbitrary script in a victim's browser via a crafted URL. The /reg.12x error response directly echoes the HTTP GET sn parameter without HTML encoding or adequate sanitization. Exploitation requires a victim to follow the crafted link, after which the script runs in that browser context and can access or alter the victim's session data.

CVSS severity4.3
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Pingbo Inc GotoHTTP 10.0 through 10.2 allows remote attackers to execute arbitrary script in a victim's browser via a crafted URL. The /reg.12x error response directly echoes the HTTP GET sn parameter without HTML encoding or adequate sanitization. Exploitation requires a victim to follow the crafted link, after which the script runs in that browser context and can access or alter the victim's session data.

The record

CVE
CVE-2026-13536
Published
Jun 29, 2026
Updated
Jun 29, 2026
Vendor
Pingbo Inc
Product
GotoHTTP
Classifications
CWE-94, CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=10.0
  2. Affected versionversion=10.1
  3. Affected versionversion=10.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Pingbo Inc · GotoHTTPversion=10.0; version=10.1; version=10.2

Published CVSS scores

5.0VulDBAV:N/AC:L/Au:N/C:N/I:P/A:N
4.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

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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