How severe is CVE-2025-61637?

CVE-2025-61637 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-61637 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-61637?

CVE-2025-61637 affects Mediawiki. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-61637?

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

Does CVE-2025-61637 have an EU (EUVD) identifier?

Yes. CVE-2025-61637 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206632.

When was CVE-2025-61637 published?

CVE-2025-61637 was published on 2026-02-03 and last updated on 2026-06-17.

CVE-2025-61637

CVE-2025-61637 is a medium-severity vulnerability in Mediawiki with a CVSS 3.x base score of 4.8. 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 3.x base score 4.8)
CVSS v4: 0.0
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-206632
Weakness: CWE-79
Affected product: Mediawiki
Published: 2026-02-03
Last modified: 2026-06-17

Description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files resources/src/mediawiki.Action/mediawiki.Action.Edit.Preview.Js, resources/src/mediawiki.Page.Preview.Js. This issue affects MediaWiki: from * before 1.39.14, 1.43.4, 1.44.1.

Frequently asked questions

What is CVE-2025-61637?: Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files resources/src/mediawiki.Action/mediawiki.Action.Edit.Preview.Js, resources/src/mediawiki.Page.Preview.Js. This issue affects MediaWiki: from * before 1.39.14, 1.43.4, 1.44.1.
How severe is CVE-2025-61637?: CVE-2025-61637 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-61637 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-61637?: CVE-2025-61637 affects Mediawiki. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-61637?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-61637 have an EU (EUVD) identifier?: Yes. CVE-2025-61637 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206632.
When was CVE-2025-61637 published?: CVE-2025-61637 was published on 2026-02-03 and last updated on 2026-06-17.

References

https://phabricator.wikimedia.org/T394856

Affected products (1)

cpe:2.3:a:mediawiki:mediawiki:*:*:*:*:*:*:*:*

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