CVE-2019-25714
Critical
Description
Seeyon OA A8 contains an unauthenticated arbitrary file write vulnerability in the /seeyon/htmlofficeservlet endpoint that allows remote attackers to write arbitrary files to the web application root by sending specially crafted POST requests with custom base64-encoded payloads. Attackers can write JSP webshells to the web root and execute them through the web server to achieve arbitrary OS command execution with web server privileges. Exploitation evidence was first observed by the Shadowserver Foundation on 2021-03-26 (UTC).
SeverityCritical
CVSS9.3
Exploit probability—
ProductA8-V5 Collaborative Management Software
PublishedApr 21, 2026
First seenApr 21, 2026
Weakness typeCWE-434Unrestricted upload of dangerous file type
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Seeyon Internet Software A8-V5 Collaborative Management Software | 6.1sp1 | — |
| Seeyon Internet Software A8+ Collaborative Management Software | 7.0, 7.0sp1, 7.0sp2, 7.0sp3, 7.1 | — |
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