How severe is CVE-2026-39837?

CVE-2026-39837 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-39837 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39837?

CVE-2026-39837 affects Mediawiki Cargo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39837?

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

Does CVE-2026-39837 have an EU (EUVD) identifier?

Yes. CVE-2026-39837 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19927.

When was CVE-2026-39837 published?

CVE-2026-39837 was published on 2026-04-07 and last updated on 2026-06-17.

CVE-2026-39837

CVE-2026-39837 is a medium-severity vulnerability in Mediawiki Cargo with a CVSS 3.x base score of 5.4. 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-80.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v4: 6.3
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19927
Weakness: CWE-80
Affected product: Mediawiki Cargo
Published: 2026-04-07
Last modified: 2026-06-17

Description

Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in WikiWorks Mediawiki - Cargo Extension allows Stored XSS.This issue affects Mediawiki - Cargo Extension: before 3.8.7.

Frequently asked questions

What is CVE-2026-39837?: Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in WikiWorks Mediawiki - Cargo Extension allows Stored XSS.This issue affects Mediawiki - Cargo Extension: before 3.8.7.
How severe is CVE-2026-39837?: CVE-2026-39837 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-39837 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39837?: CVE-2026-39837 affects Mediawiki Cargo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39837?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-39837 have an EU (EUVD) identifier?: Yes. CVE-2026-39837 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19927.
When was CVE-2026-39837 published?: CVE-2026-39837 was published on 2026-04-07 and last updated on 2026-06-17.

References

Affected products (1)

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

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