How severe is CVE-2025-51403?

CVE-2025-51403 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-51403 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-51403?

CVE-2025-51403 affects Livehelperchat Live Helper Chat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-51403?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-51403 have an EU (EUVD) identifier?

Yes. CVE-2025-51403 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-22260.

When was CVE-2025-51403 published?

CVE-2025-51403 was published on 2025-07-21 and last updated on 2026-06-17.

CVE-2025-51403

CVE-2025-51403 is a medium-severity vulnerability in Livehelperchat Live Helper Chat with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-22260
Weakness: CWE-79
Affected product: Livehelperchat Live Helper Chat
Published: 2025-07-21
Last modified: 2026-06-17

Description

A stored cross-site scripting (XSS) vulnerability in the department assignment editing module of of Live Helper Chat v4.60 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into the Alias Nick parameter.

Frequently asked questions

What is CVE-2025-51403?: A stored cross-site scripting (XSS) vulnerability in the department assignment editing module of of Live Helper Chat v4.60 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into the Alias Nick parameter.
How severe is CVE-2025-51403?: CVE-2025-51403 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-51403 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-51403?: CVE-2025-51403 affects Livehelperchat Live Helper Chat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-51403?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-51403 have an EU (EUVD) identifier?: Yes. CVE-2025-51403 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-22260.
When was CVE-2025-51403 published?: CVE-2025-51403 was published on 2025-07-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:livehelperchat:live_helper_chat:*:*:*:*:*:*:*:*

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