CVE-2021-24685: The Flat Preloader WordPress plugin before 1.5.4 does not enforce nonce checks when saving its settings, as we

Q: How do I fix CVE-2021-24685?

flat preloader: upgrade to 1.5.4. Exact commands for each OS are on this page.

Q: Is CVE-2021-24685 being exploited?

CVE-2021-24685 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-24685 affect?

CVE-2021-24685 affects flat preloader. Severity is medium (CVSS 5.4). The Flat Preloader WordPress plugin before 1.5.4 does not enforce nonce checks when saving its settings, as well as does not sanitise and escape them, which could allow attackers to a make logged in admin change them with a Cross-Site Scrip

Q: How urgent is CVE-2021-24685?

Priority 35/100. Public exploit reference

Routine

MEDIUM 5.4UPGRADE

CVE-2021-24685 is a medium-severity flaw (CVSS 5.4) affecting flat preloader. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Flat Preloader WordPress plugin before 1.5.4 does not enforce nonce checks when saving its settings, as well as does not sanitise and escape them, which could allow attackers to a make logged in admin change them with a Cross-Site Scripting payload (triggered either in the frontend or backend depending on the payload)

Why this priority

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	None
User interaction	Required
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-79, CWE-352
Published	2021-11-01
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: flat preloader project

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

Am I affected?

Timeline

2021-11-01 09:15 UTCPublished CVE record published
2026-06-17 03:40 UTCUpdated Record last modified

flat preloader project flat preloader UPGRADE

Affected: < 1.5.4

Fixed in: 1.5.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy flat-preloader || rpm -q flat-preloader || flat-preloader --version

2. UPGRADE to 1.5.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade flat-preloader

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade flat-preloader

Note

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

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-2021-24685?

flat preloader: upgrade to 1.5.4. Exact commands for each OS are on this page.

Is CVE-2021-24685 being exploited?

CVE-2021-24685 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-2021-24685 affect?

CVE-2021-24685 affects flat preloader. Severity is medium (CVSS 5.4). The Flat Preloader WordPress plugin before 1.5.4 does not enforce nonce checks when saving its settings, as well as does not sanitise and escape them, which could allow attackers to a make logged in admin change them with a Cross-Site Scrip

How urgent is CVE-2021-24685?

Priority 35/100. Public exploit reference

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2021-24789 MEDIUM 4.8 UPGRADE The Flat Preloader WordPress plugin before 1.5.5 does not escape some of its settings when outputting them in

References

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