How severe is CVE-2026-3457?

CVE-2026-3457 has a CVSS 4.0 base score of 7.0, rated high severity.

Is CVE-2026-3457 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-3457?

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-2026-3457 have an EU (EUVD) identifier?

Yes. CVE-2026-3457 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16575.

When was CVE-2026-3457 published?

CVE-2026-3457 was published on 2026-03-27 and last updated on 2026-06-17.

CVE-2026-3457

CVE-2026-3457 is a high-severity vulnerability with a CVSS 4.0 base score of 7.0. 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: High (CVSS 4.0 base score 7.0)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16575
Weakness: CWE-79
Published: 2026-03-27
Last modified: 2026-06-17

Description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Thales Sentinel LDK Runtime on Windows allows Stored XSS.This issue affects Sentinel LDK Runtime: before 10.22.

Frequently asked questions

What is CVE-2026-3457?: Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Thales Sentinel LDK Runtime on Windows allows Stored XSS.This issue affects Sentinel LDK Runtime: before 10.22.
How severe is CVE-2026-3457?: CVE-2026-3457 has a CVSS 4.0 base score of 7.0, rated high severity.
Is CVE-2026-3457 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-3457?: 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-2026-3457 have an EU (EUVD) identifier?: Yes. CVE-2026-3457 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16575.
When was CVE-2026-3457 published?: CVE-2026-3457 was published on 2026-03-27 and last updated on 2026-06-17.

References

https://supportportal.thalesgroup.com/csm?id=kb_article_view&sys_kb_id=5c18186b478aa950128dca72e36d4391&sysparm_article=KB0027106

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