Cleartext Storage of Sensitive Information in Cookies

published 2020-12-31 5 y ago modified 2026-06-17 4 mo ago also EUVD-2018-11612

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits: 0; none known

A vulnerability has been reported to affect QNAP NAS. If exploited, this vulnerability allows an attacker to access sensitive information stored in cleartext inside cookies via certain widely-available tools. QNAP have already fixed this vulnerability in the following versions: QTS 4.5.1.1456 build 20201015 (and later) QuTS hero h4.5.1.1472 build 20201031 (and later) QuTScloud c4.5.2.1379 build 20200730 (and later)

Patch / fix

fixed in 3

QNAP Systems Inc. QTS 4.5.1.1456
QNAP Systems Inc. QuTS hero h4.5.1.1472
QNAP Systems Inc. QuTScloud c4.5.2.1379

Exploit prediction

0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

QNAP Systems Inc. QTS
QNAP Systems Inc. QuTS hero
QNAP Systems Inc. QuTScloud

Classification

Weakness

CWE-315 Cleartext Storage of Sensitive Information in a Cookie
CWE-312 Cleartext Storage of Sensitive Information

References

qnap.com /zh-tw/security-advisory/qsa-20-23
vendor-advisory

Sources

CVE List CVE-2018-19941
NVD CVE-2018-19941

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Summary