What is CVE-2020-2491?

CVE-2020-2491 is a medium-severity vulnerability in QNAP Photo Station, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-12-10.

How severe is CVE-2020-2491?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in QNAP Photo Station

CVE-2020-2491

This cross-site scripting vulnerability in Photo Station allows remote attackers to inject malicious code. QANP We have already fixed this vulnerability in the following versions of Photo Station. QTS 4.5.1: Photo Station 6.0.12 and later QTS 4.4.3: Photo Station 6.0.12 and later QTS 4.3.6: Photo Station 5.7.12 and later QTS 4.3.4: Photo Station 5.7.13 and later QTS 4.3.3: Photo Station 5.4.10 and later QTS 4.2.6: Photo Station 5.2.11 and later

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-12-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.010 (61.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: +0.000

Affected products

QNAP Photo Station
QNAP Qts — versions 4.5.1, 4.4.3, 4.3.6
QNAP Systems Inc. Photo Station — versions < 6.0.12, < 5.7.12, < 5.7.13

Weakness classification (CWE)

References

www.qnap.com/en/security-advisory/qsa-20-15 (Vendor Advisory)

Frequently asked questions

What is CVE-2020-2491?: CVE-2020-2491 is a medium-severity vulnerability in QNAP Photo Station, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-12-10.
How severe is CVE-2020-2491?: Medium severity. CVSS v3 base score is 6.1 out of 10.