How severe is CVE-2026-50886?

CVE-2026-50886 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-50886 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-50886?

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

Does CVE-2026-50886 have an EU (EUVD) identifier?

Yes. CVE-2026-50886 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36784.

When was CVE-2026-50886 published?

CVE-2026-50886 was published on 2026-06-15 and last updated on 2026-06-17.

CVE-2026-50886

CVE-2026-50886 is a critical-severity vulnerability with a CVSS 3.x base score of 9.1. 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-284.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36784
Weakness: CWE-284
Published: 2026-06-15
Last modified: 2026-06-17

Description

Incorrect access control in the webhook management component of Project Firefly III v6.5.9 allows attackers to scan internal resources via a crafted POST request.

Frequently asked questions

What is CVE-2026-50886?: Incorrect access control in the webhook management component of Project Firefly III v6.5.9 allows attackers to scan internal resources via a crafted POST request.
How severe is CVE-2026-50886?: CVE-2026-50886 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-50886 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-50886?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-50886 have an EU (EUVD) identifier?: Yes. CVE-2026-50886 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36784.
When was CVE-2026-50886 published?: CVE-2026-50886 was published on 2026-06-15 and last updated on 2026-06-17.

References

https://gist.github.com/pyuysig/f5395f90753ba652835ba9c6abf4c4ae

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