4MOSAn GCB Doctor - Improper Authorization

published 2021-11-19 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-29312

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 5.8%; EPSS 5.8% chance of exploitation in 30 days, percentile 93%
public exploits: 0; none known

4MOSAn GCB Doctor’s login page has improper validation of Cookie, which allows an unauthenticated remote attacker to bypass authentication by code injection in cookie, and arbitrarily manipulate the system or interrupt services by upload and execution of arbitrary files.

Exploit prediction

5.81% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	10.0	AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

4MOSAn GCB Doctor

Classification

Weakness

CWE-285 Improper Authorization
CWE-287 Improper Authentication

References

twcert.org.tw /tw/cp-132-5313-45bde-1.html
third-party-advisory

Sources

CVE List CVE-2021-42338
NVD CVE-2021-42338

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