CVE-2018-19941: Cleartext Storage of Sensitive Information in Cookies

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-12-31 · updated 2026-06-17
Weakness: CWE-315

Description

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)

Affected products

QNAP QTS: before 4.5.1.1456 — fixed in 4.5.1.1456
QNAP Systems Inc. QuTS hero: before h4.5.1.1472 — fixed in h4.5.1.1472
QNAP Systems Inc. QuTScloud: before c4.5.2.1379 — fixed in c4.5.2.1379

How to fix

Upgrade to a fixed version: QNAP QTS 4.5.1.1456; QNAP Systems Inc. QuTS hero h4.5.1.1472; QNAP Systems Inc. QuTScloud c4.5.2.1379. Check the vendor advisory for mitigations.

References

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