How severe is CVE-2025-66458?

CVE-2025-66458 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-66458 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66458?

CVE-2025-66458 affects Lookyloo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66458?

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

Does CVE-2025-66458 have an EU (EUVD) identifier?

Yes. CVE-2025-66458 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-200306.

When was CVE-2025-66458 published?

CVE-2025-66458 was published on 2025-12-02 and last updated on 2026-06-17.

CVE-2025-66458

CVE-2025-66458 is a medium-severity vulnerability in Lookyloo with a CVSS 3.x base score of 6.1. 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 6.1)
CVSS v4: 5.3
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-200306
Weakness: CWE-79
Affected product: Lookyloo
Published: 2025-12-02
Last modified: 2026-06-17

Description

Lookyloo is a web interface that allows users to capture a website page and then display a tree of domains that call each other. Prior to 1.35.3, there are multiple XSS due to unsafe use of f-strings in Markup. The issue requires a malicious 3rd party server responding with a JSON document containing JS code in a script element. This vulnerability is fixed in 1.35.3.

Frequently asked questions

What is CVE-2025-66458?: Lookyloo is a web interface that allows users to capture a website page and then display a tree of domains that call each other. Prior to 1.35.3, there are multiple XSS due to unsafe use of f-strings in Markup. The issue requires a malicious 3rd party server responding with a JSON document containing JS code in a script element. This vulnerability is fixed in 1.35.3.
How severe is CVE-2025-66458?: CVE-2025-66458 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-66458 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66458?: CVE-2025-66458 affects Lookyloo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66458?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-66458 have an EU (EUVD) identifier?: Yes. CVE-2025-66458 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-200306.
When was CVE-2025-66458 published?: CVE-2025-66458 was published on 2025-12-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:lookyloo:lookyloo:*:*:*:*:*:*:*:*

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