How severe is CVE-2026-58517?

CVE-2026-58517 has a CVSS 4.0 base score of 6.9, rated medium severity.

Is CVE-2026-58517 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-58517?

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

When was CVE-2026-58517 published?

CVE-2026-58517 was published on 2026-07-01.

CVE-2026-58517

CVE-2026-58517 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.9. 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-288.

Key facts

Severity: Medium (CVSS 4.0 base score 6.9)
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-288
Published: 2026-07-01
Last modified: 2026-07-01

Description

Improper neutralization of input terminators vulnerability in The Wikimedia Foundation Mediawiki - WikiLambda Extension allows Authentication Bypass. This issue affects Mediawiki - WikiLambda Extension: from * before 1.43.9,1.44.6,1.45.4.

Frequently asked questions

What is CVE-2026-58517?: Improper neutralization of input terminators vulnerability in The Wikimedia Foundation Mediawiki - WikiLambda Extension allows Authentication Bypass. This issue affects Mediawiki - WikiLambda Extension: from * before 1.43.9,1.44.6,1.45.4.
How severe is CVE-2026-58517?: CVE-2026-58517 has a CVSS 4.0 base score of 6.9, rated medium severity.
Is CVE-2026-58517 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-58517?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-58517 published?: CVE-2026-58517 was published on 2026-07-01.

References

Other CWE-288 vulnerabilities

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