CVE-2024-39123: In janeczku Calibre-Web 0.6.0 to 0.6.21, the edit_book_comments function is vulnerable to Cross Site Scripting

This week

MEDIUM 5.4UPGRADE

CVE-2024-39123 is a medium-severity flaw (CVSS 5.4) affecting calibre-web. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In janeczku Calibre-Web 0.6.0 to 0.6.21, the edit_book_comments function is vulnerable to Cross Site Scripting (XSS) due to improper sanitization performed by the clean_string function. The vulnerability arises from the way the clean_string function handles HTML sanitization.

Why this priority

EPSS top 2%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	23.1% (top 2%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-07-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: janeczku

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-07-19 20:15 UTCPublished CVE record published
2026-06-17 07:41 UTCUpdated Record last modified

janeczku calibre-web UPGRADE

Affected: >= 0.6.0 and <= 0.6.21

Fixed in: newer than 0.6.21

Safe to downgrade to: a release before 0.6.0

1. Check installed version

apt-cache policy calibre-web || rpm -q calibre-web || calibre-web --version

2. UPGRADE to newer than 0.6.21 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade calibre-web

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade calibre-web

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.6.0 (Debian / Ubuntu)

apt-cache madison calibre-web sudo apt install calibre-web=<VERSION_BEFORE_0.6.0> sudo apt-mark hold calibre-web

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list calibre-web sudo dnf downgrade calibre-web-<VERSION_BEFORE_0.6.0> sudo dnf versionlock add calibre-web

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-39123?

calibre-web: upgrade to newer than 0.6.21. Exact commands for each OS are on this page.

Is CVE-2024-39123 being exploited?

CVE-2024-39123 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-39123 affect?

CVE-2024-39123 affects calibre-web. Severity is medium (CVSS 5.4). In janeczku Calibre-Web 0.6.0 to 0.6.21, the edit_book_comments function is vulnerable to Cross Site Scripting (XSS) due to improper sanitization performed by the clean_string function. The vulnerability arises from the way the clean_string

How urgent is CVE-2024-39123?

Priority 48/100. EPSS top 2%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2025-7404 CRITICAL 9.8 DOWNGRADE DOWNGRADE Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability in Ca
CVE-2025-65858 LOW 3.5 DOWNGRADE A Stored Cross-Site Scripting (XSS) vulnerability in Calibre-Web v0.6.25 allows attackers to inject malicious
CVE-2021-3988 MEDIUM 6.1 UPGRADE A Cross-site Scripting (XSS) vulnerability exists in janeczku/calibre-web, specifically in the file `edit_book
CVE-2021-3987 MEDIUM 4.3 UPGRADE An improper access control vulnerability exists in janeczku/calibre-web
CVE-2021-3986 MEDIUM 4.3 UPGRADE A vulnerability in janeczku/calibre-web allows unauthorized users to view the names of private shelves belongi

References

← Back to latest CVEs