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).
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Affected Vendors & Products
References
History
Wed, 22 Apr 2026 12:15:00 +0000
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Seeyon Internet Software
Seeyon Internet Software a8+ Collaborative Management Software Seeyon Internet Software a8-v5 Collaborative Management Software |
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Seeyon Internet Software
Seeyon Internet Software a8+ Collaborative Management Software Seeyon Internet Software a8-v5 Collaborative Management Software |
Wed, 22 Apr 2026 00:00:00 +0000
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ssvc
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Tue, 21 Apr 2026 16:30:00 +0000
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| 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). | |
| Title | Seeyon Office Anywhere (OA) A8 Unauthenticated Arbitrary File Write via htmlofficeservlet | |
| Weaknesses | CWE-434 | |
| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-04-21T16:11:54.961Z
Updated: 2026-04-21T20:37:38.941Z
Reserved: 2026-04-21T15:54:59.039Z
Link: CVE-2019-25714
Updated: 2026-04-21T20:32:00.261Z
Status : Deferred
Published: 2026-04-21T17:16:20.777
Modified: 2026-04-22T21:20:25.267
Link: CVE-2019-25714
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