CVE-2026-7429Public exploitNetwork attack vector

Browser script execution via unencoded yesTemplate output

Published Apr 30, 2026 · Updated Apr 30, 2026

Reflected cross-site scripting in SiteServer SSCMS 7.4.0 allows remote authenticated users to execute JavaScript through an STL payload. The dynamic STL endpoint decrypts and parses yesTemplate content, then places it unencoded in the JSON html field. An administrator or holder of the security key must first encrypt the payload, and a victim must render the returned content for script execution.

CVSS severity2.1
Low
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected cross-site scripting in SiteServer SSCMS 7.4.0 allows remote authenticated users to execute JavaScript through an STL payload. The dynamic STL endpoint decrypts and parses yesTemplate content, then places it unencoded in the JSON html field. An administrator or holder of the security key must first encrypt the payload, and a victim must render the returned content for script execution.

The record

CVE
CVE-2026-7429
Published
Apr 30, 2026
Updated
Apr 30, 2026
Vendor
SiteServer
Product
SSCMS
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 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=7.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SiteServer · SSCMSversion=7.4.0

Published CVSS scores

2.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
4.6VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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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