How severe is CVE-2026-42473?

CVE-2026-42473 has a CVSS 3.x base score of 9.8, 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 high.

Is CVE-2026-42473 being actively exploited?

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

How do I fix CVE-2026-42473?

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-2026-42473 have an EU (EUVD) identifier?

Yes. CVE-2026-42473 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26674.

When was CVE-2026-42473 published?

CVE-2026-42473 was published on 2026-05-01 and last updated on 2026-06-17.

CVE-2026-42473

CVE-2026-42473 is a critical-severity vulnerability with a CVSS 3.x base score of 9.8. 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-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-26674
Weakness: CWE-502
Published: 2026-05-01
Last modified: 2026-06-17

Description

Unsafe deserialization vulnerability in MixPHP Framework 2.x thru 2.2.17. The session and cache handlers use unserialize() on data from the filesystem in the FileHandler object.

Frequently asked questions

What is CVE-2026-42473?: Unsafe deserialization vulnerability in MixPHP Framework 2.x thru 2.2.17. The session and cache handlers use unserialize() on data from the filesystem in the FileHandler object.
How severe is CVE-2026-42473?: CVE-2026-42473 has a CVSS 3.x base score of 9.8, 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 high.
Is CVE-2026-42473 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-42473?: 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-2026-42473 have an EU (EUVD) identifier?: Yes. CVE-2026-42473 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26674.
When was CVE-2026-42473 published?: CVE-2026-42473 was published on 2026-05-01 and last updated on 2026-06-17.

References

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