How severe is CVE-2026-54223?

CVE-2026-54223 has a CVSS 4.0 base score of 8.6, rated high severity.

Is CVE-2026-54223 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-54223?

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-2026-54223 have an EU (EUVD) identifier?

Yes. CVE-2026-54223 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37886.

When was CVE-2026-54223 published?

CVE-2026-54223 was published on 2026-06-18.

CVE-2026-54223

CVE-2026-54223 is a high-severity vulnerability with a CVSS 4.0 base score of 8.6. 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-22.

Key facts

Severity: High (CVSS 4.0 base score 8.6)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-37886
Weakness: CWE-22
Published: 2026-06-18
Last modified: 2026-06-18

Description

UBB.threads is vulnerable to Path traversal, allowing attackers with privilege to edit templates to read and write any file on the application’s server that application has privileges to, what results in Remote Code Execution. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 7.7.5 but may also affect other versions.

Frequently asked questions

What is CVE-2026-54223?: UBB.threads is vulnerable to Path traversal, allowing attackers with privilege to edit templates to read and write any file on the application’s server that application has privileges to, what results in Remote Code Execution. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 7.7.5 but may also affect other versions.
How severe is CVE-2026-54223?: CVE-2026-54223 has a CVSS 4.0 base score of 8.6, rated high severity.
Is CVE-2026-54223 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-54223?: 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-2026-54223 have an EU (EUVD) identifier?: Yes. CVE-2026-54223 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37886.
When was CVE-2026-54223 published?: CVE-2026-54223 was published on 2026-06-18.

References

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