How severe is CVE-2026-8431?

CVE-2026-8431 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-8431 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-8431?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-8431 have an EU (EUVD) identifier?

Yes. CVE-2026-8431 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29749.

When was CVE-2026-8431 published?

CVE-2026-8431 was published on 2026-05-12 and last updated on 2026-06-17.

CVE-2026-8431

CVE-2026-8431 is a high-severity vulnerability with a CVSS 3.x base score of 7.2. 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-77.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v4: 9.4
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29749
Weakness: CWE-77
Published: 2026-05-12
Last modified: 2026-06-17

Description

An administrative user with access to configure webhooks can execute arbitrary commands by configuring and then triggering webhooks containing specific FreeMarker template syntax. This issue affects all MongoDB Ops Manager 7.0 versions and MongoDB Ops Manager versions 8.0.22 and prior.

Frequently asked questions

What is CVE-2026-8431?: An administrative user with access to configure webhooks can execute arbitrary commands by configuring and then triggering webhooks containing specific FreeMarker template syntax. This issue affects all MongoDB Ops Manager 7.0 versions and MongoDB Ops Manager versions 8.0.22 and prior.
How severe is CVE-2026-8431?: CVE-2026-8431 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-8431 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-8431?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-8431 have an EU (EUVD) identifier?: Yes. CVE-2026-8431 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29749.
When was CVE-2026-8431 published?: CVE-2026-8431 was published on 2026-05-12 and last updated on 2026-06-17.

References

https://www.mongodb.com/docs/ops-manager/current/release-notes/application/#onprem-server-8.0.23

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