The Accellion FTP server prior to version FTA_9_12_220 is vulnerable to cross-site scripting.

published 2018-07-13 8 y ago modified 2026-06-17 4 mo ago also EUVD-2016-10305

cvss: 5.3; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 7.7%; EPSS 7.7% chance of exploitation in 30 days, percentile 94%
public exploits: 0; none known

Accellion FTP server prior to version FTA_9_12_220 only returns the username in the server response if the username is invalid. An attacker may use this information to determine valid user accounts and enumerate them.

Patch / fix

fixed in 1

accellion ftp_server fta_9_12_220

Exploit prediction

7.67% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

qualys.com https://www.qualys.com/2016/12/06/qsa-2016-12-06/qsa-2016-12-06.pdf referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	5.3	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

Accellion FTP Server

Classification

Weakness

CWE-204 Observable Response Discrepancy
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

qualys.com /2016/12/06/qsa-2016-12-06/qsa-2016-12-06.pdf
exploit, third-party-advisory
securityfocus.com /bid/96154
vdb-entry, third-party-advisory
kb.cert.org /vuls/id/745607
third-party-advisory, us-government-resource

Sources

CVE List CVE-2016-9499
NVD CVE-2016-9499

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary