How severe is CVE-2025-62656?

CVE-2025-62656 has a CVSS 4.0 base score of 5.8, rated medium severity.

Is CVE-2025-62656 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-62656?

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

Does CVE-2025-62656 have an EU (EUVD) identifier?

Yes. CVE-2025-62656 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-35105.

When was CVE-2025-62656 published?

CVE-2025-62656 was published on 2025-10-20 and last updated on 2026-06-17.

CVE-2025-62656

CVE-2025-62656 is a medium-severity vulnerability with a CVSS 4.0 base score of 5.8. 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 4.0 base score 5.8)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-35105
Weakness: CWE-79
Published: 2025-10-20
Last modified: 2026-06-17

Description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in The Wikimedia Foundation MediaWiki GlobalBlocking extension allows Stored XSS.This issue affects MediaWiki GlobalBlocking extension: 1.43, 1.44.

Frequently asked questions

What is CVE-2025-62656?: Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in The Wikimedia Foundation MediaWiki GlobalBlocking extension allows Stored XSS.This issue affects MediaWiki GlobalBlocking extension: 1.43, 1.44.
How severe is CVE-2025-62656?: CVE-2025-62656 has a CVSS 4.0 base score of 5.8, rated medium severity.
Is CVE-2025-62656 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-62656?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-62656 have an EU (EUVD) identifier?: Yes. CVE-2025-62656 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-35105.
When was CVE-2025-62656 published?: CVE-2025-62656 was published on 2025-10-20 and last updated on 2026-06-17.

References

https://phabricator.wikimedia.org/T403291

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