How severe is CVE-2025-1781?

CVE-2025-1781 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-1781 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-1781?

CVE-2025-1781 affects W3 Css Validator. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-1781?

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

Does CVE-2025-1781 have an EU (EUVD) identifier?

Yes. CVE-2025-1781 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-8618.

When was CVE-2025-1781 published?

CVE-2025-1781 was published on 2025-03-28 and last updated on 2026-06-17.

CVE-2025-1781

CVE-2025-1781 is a medium-severity vulnerability in W3 Css Validator 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-611.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 8.4
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-8618
Weakness: CWE-611
Affected product: W3 Css Validator
Published: 2025-03-28
Last modified: 2026-06-17

Description

There is a XXE in W3CSS Validator versions before cssval-20250226 that allows an attacker to use specially-crafted XML objects to coerce server-side request forgery (SSRF). This could be exploited to read arbitrary local files if an attacker has access to exception messages.

Frequently asked questions

What is CVE-2025-1781?: There is a XXE in W3CSS Validator versions before cssval-20250226 that allows an attacker to use specially-crafted XML objects to coerce server-side request forgery (SSRF). This could be exploited to read arbitrary local files if an attacker has access to exception messages.
How severe is CVE-2025-1781?: CVE-2025-1781 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-1781 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-1781?: CVE-2025-1781 affects W3 Css Validator. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-1781?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-1781 have an EU (EUVD) identifier?: Yes. CVE-2025-1781 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-8618.
When was CVE-2025-1781 published?: CVE-2025-1781 was published on 2025-03-28 and last updated on 2026-06-17.

References

https://github.com/google/security-research/security/advisories/GHSA-745m-xmq6-g6x7

Affected products (1)

cpe:2.3:a:w3:css_validator:*:*:*:*:*:*:*:*

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