How severe is CVE-2025-51503?

CVE-2025-51503 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.

Is CVE-2025-51503 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-51503?

CVE-2025-51503 affects Microweber. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-51503?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-51503 have an EU (EUVD) identifier?

Yes. CVE-2025-51503 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-23298.

When was CVE-2025-51503 published?

CVE-2025-51503 was published on 2025-07-31 and last updated on 2026-06-17.

CVE-2025-51503

CVE-2025-51503 is a high-severity vulnerability in Microweber with a CVSS 3.x base score of 7.6. 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: High (CVSS 3.x base score 7.6)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-23298
Weakness: CWE-79
Affected product: Microweber
Published: 2025-07-31
Last modified: 2026-06-17

Description

A Stored Cross-Site Scripting (XSS) vulnerability in Microweber CMS 2.0 allows attackers to inject malicious scripts into user profile fields, leading to arbitrary JavaScript execution in admin browsers.

Frequently asked questions

What is CVE-2025-51503?: A Stored Cross-Site Scripting (XSS) vulnerability in Microweber CMS 2.0 allows attackers to inject malicious scripts into user profile fields, leading to arbitrary JavaScript execution in admin browsers.
How severe is CVE-2025-51503?: CVE-2025-51503 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.
Is CVE-2025-51503 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-51503?: CVE-2025-51503 affects Microweber. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-51503?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-51503 have an EU (EUVD) identifier?: Yes. CVE-2025-51503 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-23298.
When was CVE-2025-51503 published?: CVE-2025-51503 was published on 2025-07-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:microweber:microweber:2.0.0:*:*:*:*:*:*:*

More vulnerabilities in Microweber

CVE-2023-1877 — Critical (CVSS 9.8): Command Injection in GitHub repository microweber/microweber prior to 1.3.3.
CVE-2022-0895 — Critical (CVSS 9.8): Static Code Injection in GitHub repository microweber/microweber prior to 1.3.
CVE-2020-23138 — Critical (CVSS 9.8): An unrestricted file upload vulnerability was discovered in the Microweber 1.1.18 admin account page. An attacker can…
CVE-2023-49052 — High (CVSS 8.8): File Upload vulnerability in Microweber v.2.0.4 allows a remote attacker to execute arbitrary code via a crafted script…
CVE-2023-2240 — High (CVSS 8.8): Improper Privilege Management in GitHub repository microweber/microweber prior to 1.3.4.
CVE-2022-33012 — High (CVSS 8.8): Microweber v1.2.15 was discovered to allow attackers to perform an account takeover via a host header injection attack.

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