Critical 9.3Published Apr 21, 2026

CVE-2019-25714Seeyon Office Anywhere (OA) A8 Unauthenticated Arbitrary File Write via htmlofficeservlet

Updated under an hour ago (Oct 26, 2026, 6:50 PM ET)

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It affects Seeyon Internet Software A8-V5 Collaborative Management Software and 1 other product. Add what you run to find out whether that includes you.

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Every CVE for Seeyon Internet Software A8-V5 Collaborative Management Software

Exploited in the last 30 days

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).

CVSS: 9.3 CRITICAL (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-434
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Jul 27, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Seeyon Internet Software A8-V5 Collaborative Management Software seeyon_internet_software:a8_v5_collaborative_management_software (from the name)	6.1sp1	CNA record
Seeyon Internet Software A8+ Collaborative Management Software seeyon_internet_software:a8+_collaborative_management_software (from the name)	7.0; 7.0sp1; 7.0sp2; 7.0sp3; 7.1	CNA record

References

References

https://sourceforge.net/software/product/A8/	product
https://web.archive.org/web/20190821034711/http://wyb0.com/posts/2019/seeyon-htmlofficeservlet-getshell/	exploit
https://wiki.96.mk/Web%E5%AE%89%E5%85%A8/%E8%87%B4%E8%BF%9Coa/%E8%87%B4%E8%BF%9C%20OA%20A8%20htmlofficeservlet%20getshell%20%E6%BC%8F%E6%B4%9E/	exploit
https://static-aliyun-doc.oss-cn-hangzhou.aliyuncs.com/download/pdf/90916/Security_Notification_reseller_en-US.pdf	third-party-advisory, mitigation
https://www.broadcom.com/support/security-center/attacksignatures/detail?asid=31713	third-party-advisory
https://www.fortiguard.com/encyclopedia/ips/48874/seeyon-office-anywhere-htmlofficeservlet-arbitrary-file-upload	third-party-advisory
https://www.vulncheck.com/advisories/seeyon-office-anywhere-oa-a8-unauthenticated-arbitrary-file-write-via-htmlofficeservlet	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.