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Vulnerabilities

Vulnerability · CVE-2025-54336

In Plesk Obsidian 18.0.70, _isAdminPasswordValid uses an == comparison.

Published Aug 19, 2025 · catalog updated Aug 29, 2025 · In Plesk Obsidian 18.0.70,

Check this week

CVE-2025-54336 is not in CISA KEV. FIRST estimates a 55.00% chance of exploitation in the next 30 days. Check whether you run In Plesk Obsidian 18.0.70,.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (In Plesk Obsidian 18.0.70,).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
55.00%
Remediation
Vendor / distro source
Affected products
vendor n/a n/a n/a

In Plesk Obsidian 18.0.70, _isAdminPasswordValid uses an == comparison. Thus, if the correct password is "0e" followed by any digit string, then an attacker can login with any other string that evaluates to 0.0 (such as the 0e0 string). This occurs in admin/plib/LoginManager.php.

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 n/a n/a n/an/a

How to fix CVE-2025-54336

  • Recommended remediation

    A vendor or distribution source is linked. Check that advisory for patch availability; this catalog does not invent fix status.

  • Official advisories

What to do

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

Should you patch?

CVE-2025-54336 is not in CISA KEV. FIRST estimates a 55.00% chance of exploitation in the next 30 days. Check whether you run In Plesk Obsidian 18.0.70,.

Which versions are affected?

Compare what you have installed with n/a n/a n/a n/a. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 55.00%. 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.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 19, 2025 · EUVD

    Detected

    In Plesk Obsidian 18.0.70, _isAdminPasswordValid uses an == comparison. Thus, if the correct password is "0e" followed by any digit string, then an attacker can login with any other string that evaluates to 0.0 (such as the 0e0 string). This occurs in admin/plib/LoginManager.php.

  2. Aug 29, 2025 · EUVD

    Updated

    In Plesk Obsidian 18.0.70, _isAdminPasswordValid uses an == comparison. Thus, if the correct password is "0e" followed by any digit string, then an attacker can login with any other string that evaluates to 0.0 (such as the 0e0 string). This occurs in admin/plib/LoginManager.php.

Sources

  • EUVDVulnerability recordEUVD-2025-25168

    In Plesk Obsidian 18.0.70, _isAdminPasswordValid uses an == comparison. Thus, if the correct password is "0e" followed by any digit string, then an attacker can login with any other string that evaluates to 0.0 (such as the 0e0 string). This occurs in admin/plib/LoginManager.php.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Aug 29, 2025. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.