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Vulnerabilities

Security fix · CVE-2025-52557

Mail-0's Zero is an open-source email solution.

Published Jun 21, 2025 · catalog updated Jun 23, 2025 · Mail-0 Zero

Last checked Oct 26, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-52557. EPSS is 0.42%. Act only if a listed version of Mail-0 Zero is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.6
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.42%
Remediation
Advisory link
Affected products
vendor Mail-0 Zero = 0.8

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Mail-0 Zero = 0.8= 0.8

How to fix CVE-2025-52557

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-52557. EPSS is 0.42%. Act only if a listed version of Mail-0 Zero is installed.

Which versions are affected?

Compare what you have installed with Mail-0 Zero = 0.8 = 0.8. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.42%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 21, 2025 · EUVD

    Detected

    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.

  2. Jun 23, 2025 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2025-52557

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-52557

    30-day exploitation probability 0.42%

    first.org
  • EUVDVulnerability recordEUVD-2025-18797

    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.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 26, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 21, 2026
  • EUVDOct 20, 2026