How severe is CVE-2026-8209?

CVE-2026-8209 has a CVSS 4.0 base score of 6.9, rated medium severity.

Is CVE-2026-8209 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-8209?

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

Does CVE-2026-8209 have an EU (EUVD) identifier?

Yes. CVE-2026-8209 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28899.

When was CVE-2026-8209 published?

CVE-2026-8209 was published on 2026-05-09 and last updated on 2026-06-17.

CVE-2026-8209

CVE-2026-8209 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-23.

Key facts

Severity: Medium (CVSS 4.0 base score 6.9)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28899
Weakness: CWE-23
Published: 2026-05-09
Last modified: 2026-06-17

Description

Gibbon versions before v30.0.01 are affected by a path traversal vulnerability resulting in DOS by attempting extraction of web application PHP files, failed .zip extraction results in deletion of the file and a DOS condition. Successful exploitation requires Teacher or higher privileges. Exploitation could result in loss of availability of the web application.

Frequently asked questions

What is CVE-2026-8209?: Gibbon versions before v30.0.01 are affected by a path traversal vulnerability resulting in DOS by attempting extraction of web application PHP files, failed .zip extraction results in deletion of the file and a DOS condition. Successful exploitation requires Teacher or higher privileges. Exploitation could result in loss of availability of the web application.
How severe is CVE-2026-8209?: CVE-2026-8209 has a CVSS 4.0 base score of 6.9, rated medium severity.
Is CVE-2026-8209 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-8209?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-8209 have an EU (EUVD) identifier?: Yes. CVE-2026-8209 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28899.
When was CVE-2026-8209 published?: CVE-2026-8209 was published on 2026-05-09 and last updated on 2026-06-17.

References

Other CWE-23 vulnerabilities

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