SysJust CTS Web - Broken Authentication

published 2021-05-28 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-19389

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits: 0; none known

The CTS Web transaction system related to authentication management is implemented incorrectly. After login, remote attackers can manipulate cookies to access other accounts and trade in the stock market with spoofed identity.

Patch / fix

fixed in 1

sysjust cts_web 2021.3.24

Exploit prediction

0.76% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
NVD	2.0	5.5	AV:N/AC:L/Au:S/C:P/I:P/A:N

Affected products

SysJust CTS Web

Classification

Weakness

CWE-287 Improper Authentication

References

twcert.org.tw /tw/cp-132-4759-92eab-1.html
third-party-advisory
chtsecurity.com /news/40e165e2-e539-49bc-bcf1-e3b27c29e344
third-party-advisory

Sources

CVE List CVE-2021-32543
NVD CVE-2021-32543

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