CVE-2022-28353: In the External Redirect Warning Plugin 1.3 for MyBB, the redirect URL (aka external.php?url=) is vulnerable t

Routine

MEDIUM 6.1DOWNGRADE

CVE-2022-28353 is a medium-severity flaw (CVSS 6.1) affecting external redirect warning. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In the External Redirect Warning Plugin 1.3 for MyBB, the redirect URL (aka external.php?url=) is vulnerable to XSS.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 54%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-04-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: external redirect warning project

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

Am I affected?

Timeline

2023-04-16 03:15 UTCPublished CVE record published
2026-06-17 04:38 UTCUpdated Record last modified

external redirect warning project external redirect warning DOWNGRADE

Affected: 1.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3

1. Check installed version

apt-cache policy external-redirect-warning || rpm -q external-redirect-warning || external-redirect-warning --version

2. No fixed release: DOWNGRADE to a release before 1.3 (Debian / Ubuntu)

apt-cache madison external-redirect-warning sudo apt install external-redirect-warning=<VERSION_BEFORE_1.3> sudo apt-mark hold external-redirect-warning

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list external-redirect-warning sudo dnf downgrade external-redirect-warning-<VERSION_BEFORE_1.3> sudo dnf versionlock add external-redirect-warning

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-2022-28353?

external redirect warning: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-28353 being exploited?

CVE-2022-28353 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-2022-28353 affect?

CVE-2022-28353 affects external redirect warning. Severity is medium (CVSS 6.1). In the External Redirect Warning Plugin 1.3 for MyBB, the redirect URL (aka external.php?url=) is vulnerable to XSS.

How urgent is CVE-2022-28353?

Priority 38/100. Public exploit reference

Software pages

PHP vulnerabilities

References

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