Is CVE-2021-3988 in the CISA KEV catalog?

No. CVE-2021-3988 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3988?

CVE-2021-3988 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2021-3988?

CVE-2021-3988 has an EPSS score of 0.36% (28th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3988?

Upgrade calibre-web to 0.6.15 or later.

CVE & CISA-KEV Catalog

CVE-2021-3988

MEDIUM

6.1

CVSS v3

NVD

Description

A Cross-site Scripting (XSS) vulnerability exists in janeczku/calibre-web, specifically in the file `edit_books.js`. The vulnerability occurs when editing book properties, such as uploading a cover or a format. The affected code directly inserts user input into the DOM without proper sanitization, allowing attackers to execute arbitrary JavaScript code. This can lead to various attacks, including stealing cookies. The issue is present in the code handling the `#btn-upload-cover` change event.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

calibre-webNVD

Affected:< 0.6.15Fixed in:0.6.15CVE-2021-3988derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploit Intelligence

0.36%probability of exploitation in 30 days

28thpercentile

Low risk: more likely to be exploited than 28% of all known CVEs.

References

Patch1

github.com

Exploit1

huntr.com

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

Embed a live status badge for CVE-2021-3988

Markdown

[![CVE-2021-3988](https://tridentstack.com/cve/badge/CVE-2021-3988.svg)](https://tridentstack.com/cve/CVE-2021-3988)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-3988"><img src="https://tridentstack.com/cve/badge/CVE-2021-3988.svg" alt="CVE-2021-3988"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-19.