How severe is CVE-2025-40846?

CVE-2025-40846 has a CVSS 4.0 base score of 7.1, rated high severity.

Is CVE-2025-40846 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-2025-40846?

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-2025-40846 have an EU (EUVD) identifier?

Yes. CVE-2025-40846 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-13959.

When was CVE-2025-40846 published?

CVE-2025-40846 was published on 2025-05-08 and last updated on 2026-06-17.

CVE-2025-40846

CVE-2025-40846 is a high-severity vulnerability with a CVSS 4.0 base score of 7.1. 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-20.

Key facts

Severity: High (CVSS 4.0 base score 7.1)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-13959
Weakness: CWE-20
Published: 2025-05-08
Last modified: 2026-06-17

Description

Improper Input Validation, the returnUrl parameter in Account Security Settings lacks proper input validation, allowing attackers to redirect users to malicious websites (Open Redirect) and inject JavaScript code to perform cross site scripting attack. The vulnerability affects Halo versions up to 2.174.101 and all versions between 2.175.1 and 2.184.21

Frequently asked questions

What is CVE-2025-40846?: Improper Input Validation, the returnUrl parameter in Account Security Settings lacks proper input validation, allowing attackers to redirect users to malicious websites (Open Redirect) and inject JavaScript code to perform cross site scripting attack. The vulnerability affects Halo versions up to 2.174.101 and all versions between 2.175.1 and 2.184.21
How severe is CVE-2025-40846?: CVE-2025-40846 has a CVSS 4.0 base score of 7.1, rated high severity.
Is CVE-2025-40846 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-2025-40846?: 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-2025-40846 have an EU (EUVD) identifier?: Yes. CVE-2025-40846 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-13959.
When was CVE-2025-40846 published?: CVE-2025-40846 was published on 2025-05-08 and last updated on 2026-06-17.

References

https://support.haloservicedesk.com/kb?id=2501

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