How severe is CVE-2026-39839?

CVE-2026-39839 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-2026-39839 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-39839?

CVE-2026-39839 affects Mediawiki Cargo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-39839?

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

Does CVE-2026-39839 have an EU (EUVD) identifier?

Yes. CVE-2026-39839 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19891.

When was CVE-2026-39839 published?

CVE-2026-39839 was published on 2026-04-07 and last updated on 2026-06-17.

CVE-2026-39839

CVE-2026-39839 is a medium-severity vulnerability in Mediawiki Cargo 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-80.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 6.3
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19891
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 Wikimedia Foundation Mediawiki - Cargo Extension allows Stored XSS.This issue affects Mediawiki - Cargo Extension: before 3.8.7.

Frequently asked questions

What is CVE-2026-39839?: Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in Wikimedia Foundation Mediawiki - Cargo Extension allows Stored XSS.This issue affects Mediawiki - Cargo Extension: before 3.8.7.
How severe is CVE-2026-39839?: CVE-2026-39839 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-2026-39839 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-39839?: CVE-2026-39839 affects Mediawiki Cargo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-39839?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-39839 have an EU (EUVD) identifier?: Yes. CVE-2026-39839 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19891.
When was CVE-2026-39839 published?: CVE-2026-39839 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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