CVE-2025-56451Public exploitNetwork attack vector

Client-side script execution via unneutralized topValue

Published Jan 16, 2026 · Updated Jan 16, 2026

Cross-site scripting in Seeyon A8+ Collaborative Management Software 7.0 SP3 allows remote attackers to execute script via topValue. The seeyon/main.do endpoint incorporates the topValue request parameter into generated page content without the neutralization required to prevent script interpretation. Exploitation requires a victim to open a crafted request, after which script runs in the affected site's browser origin and can read or alter data available to that session.

CVSS severity6.1
Medium
EPSS probability0.22%
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 Seeyon A8+ Collaborative Management Software 7.0 SP3 allows remote attackers to execute script via topValue. The seeyon/main.do endpoint incorporates the topValue request parameter into generated page content without the neutralization required to prevent script interpretation. Exploitation requires a victim to open a crafted request, after which script runs in the affected site's browser origin and can read or alter data available to that session.

The record

CVE
CVE-2025-56451
Published
Jan 16, 2026
Updated
Jan 16, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 16, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1CISA-ADPCVSS: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.

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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 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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