CVE-2021-24853: The QR Redirector WordPress plugin before 1.6 does not have capability and CSRF checks when saving bulk QR Red

Q: How do I fix CVE-2021-24853?

qr redirector: upgrade to 1.6. Exact commands for each OS are on this page.

Q: Is CVE-2021-24853 being exploited?

CVE-2021-24853 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-2021-24853 affect?

CVE-2021-24853 affects qr redirector. Severity is medium (CVSS 4.3). The QR Redirector WordPress plugin before 1.6 does not have capability and CSRF checks when saving bulk QR Redirector settings via the qr_save_bulk AJAX action, which could allow any authenticated user, such as subscriber to change the redi

Q: How urgent is CVE-2021-24853?

Priority 30/100. Public exploit reference

Routine

MEDIUM 4.3UPGRADE

CVE-2021-24853 is a medium-severity flaw (CVSS 4.3) affecting qr redirector. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The QR Redirector WordPress plugin before 1.6 does not have capability and CSRF checks when saving bulk QR Redirector settings via the qr_save_bulk AJAX action, which could allow any authenticated user, such as subscriber to change the redirect response status code of arbitrary QR Redirects

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	0.4% (top 61%)
CISA exploited list	No
Weakness	CWE-284, CWE-352
Published	2021-11-17
Last modified	2026-06-17

Publisher (CNA): WPScan · Vendor: qr redirector project

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

Am I affected?

Timeline

2021-11-17 11:15 UTCPublished CVE record published
2026-06-17 03:41 UTCUpdated Record last modified

qr redirector project qr redirector UPGRADE

Affected: < 1.6

Fixed in: 1.6

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy qr-redirector || rpm -q qr-redirector || qr-redirector --version

2. UPGRADE to 1.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade qr-redirector

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade qr-redirector

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-2021-24853?

qr redirector: upgrade to 1.6. Exact commands for each OS are on this page.

Is CVE-2021-24853 being exploited?

CVE-2021-24853 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-2021-24853 affect?

CVE-2021-24853 affects qr redirector. Severity is medium (CVSS 4.3). The QR Redirector WordPress plugin before 1.6 does not have capability and CSRF checks when saving bulk QR Redirector settings via the qr_save_bulk AJAX action, which could allow any authenticated user, such as subscriber to change the redi

How urgent is CVE-2021-24853?

Priority 30/100. Public exploit reference

Software pages

WordPress vulnerabilities

Related CVEs

CVE-2021-24854 MEDIUM 5.4 UPGRADE The QR Redirector WordPress plugin before 1.6.1 does not sanitise and escape some of the QR Redirect fields, w

References

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