How severe is CVE-2025-52557?

CVE-2025-52557 has a CVSS 4.0 base score of 8.6, rated high severity.

Is CVE-2025-52557 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-52557?

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-2025-52557 have an EU (EUVD) identifier?

Yes. CVE-2025-52557 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-18797.

When was CVE-2025-52557 published?

CVE-2025-52557 was published on 2025-06-21 and last updated on 2026-06-17.

CVE-2025-52557

CVE-2025-52557 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-1384.

Key facts

Severity: High (CVSS 4.0 base score 8.6)
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-18797
Weakness: CWE-1384
Published: 2025-06-21
Last modified: 2026-06-17

Description

Mail-0's Zero is an open-source email solution. In version 0.8 it's possible for an attacker to craft an email that executes javascript leading to session hijacking due to improper sanitization. This issue has been patched in version 0.81.

Frequently asked questions

What is CVE-2025-52557?: Mail-0's Zero is an open-source email solution. In version 0.8 it's possible for an attacker to craft an email that executes javascript leading to session hijacking due to improper sanitization. This issue has been patched in version 0.81.
How severe is CVE-2025-52557?: CVE-2025-52557 has a CVSS 4.0 base score of 8.6, rated high severity.
Is CVE-2025-52557 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-52557?: 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-2025-52557 have an EU (EUVD) identifier?: Yes. CVE-2025-52557 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-18797.
When was CVE-2025-52557 published?: CVE-2025-52557 was published on 2025-06-21 and last updated on 2026-06-17.

References

Other CWE-1384 vulnerabilities

CVE-2026-2760 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component. This vulnerability was fixed…
CVE-2026-2759 — Critical (CVSS 9.8): Incorrect boundary conditions in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 148, Firefox…
CVE-2026-2757 — Critical (CVSS 9.8): Incorrect boundary conditions in the WebRTC: Audio/Video component. This vulnerability was fixed in Firefox 148,…
CVE-2024-39355 — Medium (CVSS 6.5): Improper handling of physical or environmental conditions in some Intel(R) Processors may allow an authenticated user…

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