CVE-2021-24431: The Language Bar Flags WordPress plugin through 1.0.8 does not have any CSRF in place when saving its settings

Q: How do I fix CVE-2021-24431?

language bar flags: upgrade to newer than 1.0.8. Exact commands for each OS are on this page.

Q: Is CVE-2021-24431 being exploited?

CVE-2021-24431 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-2021-24431 affect?

CVE-2021-24431 affects language bar flags. Severity is medium (CVSS 4.3). The Language Bar Flags WordPress plugin through 1.0.8 does not have any CSRF in place when saving its settings and did not sanitise or escape them when generating the flag bar in the frontend. This could allow attackers to make a logged in

Q: How urgent is CVE-2021-24431?

Priority 30/100. Public exploit reference

Routine

MEDIUM 4.3UPGRADE

CVE-2021-24431 is a medium-severity flaw (CVSS 4.3) affecting language bar flags. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Language Bar Flags WordPress plugin through 1.0.8 does not have any CSRF in place when saving its settings and did not sanitise or escape them when generating the flag bar in the frontend. This could allow attackers to make a logged in admin change the settings, and set Cross-Site Scripting payload in them, which will be executed in the frontend for all users

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-79, CWE-352
Published	2021-09-13
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: language bar flags project

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

Am I affected?

Timeline

2021-09-13 18:15 UTCPublished CVE record published
2026-06-17 03:40 UTCUpdated Record last modified

language bar flags project language bar flags UPGRADE

Affected: <= 1.0.8

Fixed in: newer than 1.0.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy language-bar-flags || rpm -q language-bar-flags || language-bar-flags --version

2. UPGRADE to newer than 1.0.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade language-bar-flags

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade language-bar-flags

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-2021-24431?

language bar flags: upgrade to newer than 1.0.8. Exact commands for each OS are on this page.

Is CVE-2021-24431 being exploited?

CVE-2021-24431 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-2021-24431 affect?

CVE-2021-24431 affects language bar flags. Severity is medium (CVSS 4.3). The Language Bar Flags WordPress plugin through 1.0.8 does not have any CSRF in place when saving its settings and did not sanitise or escape them when generating the flag bar in the frontend. This could allow attackers to make a logged in

How urgent is CVE-2021-24431?

Priority 30/100. Public exploit reference

Software pages

WordPress vulnerabilities

References

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