How severe is CVE-2026-54219?

CVE-2026-54219 has a CVSS 4.0 base score of 5.1, rated medium severity.

Is CVE-2026-54219 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-2026-54219?

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

Does CVE-2026-54219 have an EU (EUVD) identifier?

Yes. CVE-2026-54219 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37882.

When was CVE-2026-54219 published?

CVE-2026-54219 was published on 2026-06-18.

CVE-2026-54219

CVE-2026-54219 is a medium-severity vulnerability with a CVSS 4.0 base score of 5.1. 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-79.

Key facts

Severity: Medium (CVSS 4.0 base score 5.1)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-37882
Weakness: CWE-79
Published: 2026-06-18
Last modified: 2026-06-18

Description

UBB.threads is vulnerable to Stored XSS via user posts and user profile fields. The application fails to properly sanitize user input, allowing low privileged attackers to inject arbitrary JavaScript that executes in a victim's browser upon viewing. 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-2026-54219?: UBB.threads is vulnerable to Stored XSS via user posts and user profile fields. The application fails to properly sanitize user input, allowing low privileged attackers to inject arbitrary JavaScript that executes in a victim's browser upon viewing. 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-2026-54219?: CVE-2026-54219 has a CVSS 4.0 base score of 5.1, rated medium severity.
Is CVE-2026-54219 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-2026-54219?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-54219 have an EU (EUVD) identifier?: Yes. CVE-2026-54219 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37882.
When was CVE-2026-54219 published?: CVE-2026-54219 was published on 2026-06-18.

References

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