CVE-2023-31434Public exploitNetwork attack vector

Authenticated browser script execution via unvalidated web parameters

Published May 2, 2023 · Updated Jan 30, 2025

Cross-site scripting in evasys before 8.2 Build 2286 and 9.x before 9.0 Build 2401 allows remote authenticated users to execute browser scripts. The user-profile fields nutzer_titel, nutzer_vn, and nutzer_nn and direct-link parameters langID and ONLINEID accept unvalidated HTML and JavaScript that browsers render or execute. Trainer-level access is sufficient to seed reflected or persistent payloads that run when another person opens the generated survey or an affected administrative view.

CVSS severity5.4
Medium
EPSS probability0.47%
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 evasys before 8.2 Build 2286 and 9.x before 9.0 Build 2401 allows remote authenticated users to execute browser scripts. The user-profile fields nutzer_titel, nutzer_vn, and nutzer_nn and direct-link parameters langID and ONLINEID accept unvalidated HTML and JavaScript that browsers render or execute. Trainer-level access is sufficient to seed reflected or persistent payloads that run when another person opens the generated survey or an affected administrative view.

The record

CVE
CVE-2023-31434
Published
May 2, 2023
Updated
Jan 30, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 2, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/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 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')
T1189Drive-by Compromise

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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