What’s Vulnerable › Vulnerabilities

CVE-2026-15933: Cleartext Storage of Sensitive Credentials in OptimiDoc Server (On-Premise)

• Severity: medium (CVSS 6.9 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-03 · updated 2026-09-08
• Weakness: CWE-256

Description

OptimiDoc Server (On-Premise) stores credentials for external services in cleartext. An authenticated administrator can view previously configured service passwords, including SMTP, FTP (for scan delivery), Active Directory (for user list import), and SharePoint credentials, in cleartext via the web administration panel page source, allowing exposure of sensitive third-party authentication data. This issue was fixed in version 26.08

Affected products

• OptimiDoc Server: before 26.08 — fixed in 26.08

How to fix

Upgrade to a fixed version: OptimiDoc Server 26.08. Check the vendor advisory for mitigations.

References

• https://cert.pl/en/posts/2026/09/CVE-2026-15933
• https://optimidoc.com/category/optimidoc-server/

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