CVE-2026-5790Network attack vector

Session theft via persistently stored script injection

Published May 14, 2026 · Updated May 14, 2026

Stored XSS in STEL Order 3.25.1 and earlier allows remote attackers to inject persistent script through legalName and employeeID. The /app/FrontController endpoint stores the two parameter values without proper input sanitization and later renders the injected code in other users' browsers. Exploitation requires a victim to access an affected section, where the script can steal session cookies and hijack the victim's account.

CVSS severity5.1
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 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.

Book a demo

Summary

What happened

Stored XSS in STEL Order 3.25.1 and earlier allows remote attackers to inject persistent script through legalName and employeeID. The /app/FrontController endpoint stores the two parameter values without proper input sanitization and later renders the injected code in other users' browsers. Exploitation requires a victim to access an affected section, where the script can steal session cookies and hijack the victim's account.

The record

CVE
CVE-2026-5790
Published
May 14, 2026
Updated
May 14, 2026
Vendor
STEL Solutions, S.L.
Product
STEL Order
Classifications
CWE-79, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 14, 2026CVE publishedPublication date reported by the CVE source.
  2. May 14, 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 <=3.25.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

STEL Solutions, S.L. · STEL Orderversion=0 <=3.25.1

Published CVSS scores

5.1Spanish National Cybersecurity Institute, S.A. (INCIBE)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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')
T1539Steal Web Session Cookie

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

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo