CVE-2026-8403Network attack vector

Browser script execution via stored web input

Published Jun 30, 2026 · Updated Jun 30, 2026

Stored cross-site scripting in Exagate SYSGuard 6001 2.0.2 through versions before 6.1.4.0 allows remote attackers to run script in a user's browser. The record says input is stored and later emitted during web page generation without proper neutralization, but the affected field and rendering function are undisclosed. Exploitation requires a user to view the stored content; the script then runs in that user's web context, with no reported ability to interrupt appliance service.

CVSS severity6.1
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Exagate SYSGuard 6001 2.0.2 through versions before 6.1.4.0 allows remote attackers to run script in a user's browser. The record says input is stored and later emitted during web page generation without proper neutralization, but the affected field and rendering function are undisclosed. Exploitation requires a user to view the stored content; the script then runs in that user's web context, with no reported ability to interrupt appliance service.

The record

CVE
CVE-2026-8403
Published
Jun 30, 2026
Updated
Jun 30, 2026
Vendor
Eksagate
Product
SYSGuard 6001
Classifications
CWE-79, CAPEC-592, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 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=2.0.2 <6.1.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Eksagate · SYSGuard 6001version=2.0.2 <6.1.4.0

Published CVSS scores

6.1TR-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1203Exploitation for Client Execution

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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