CVE-2026-22216: wpDiscuz before 7.6.47 contains a missing rate limiting vulnerability that allows unauthenticated attackers to

Q: How do I fix CVE-2026-22216?

wpdiscuz: upgrade to 7.6.47. Exact commands for each OS are on this page.

Q: Is CVE-2026-22216 being exploited?

CVE-2026-22216 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-2026-22216 affect?

CVE-2026-22216 affects wpdiscuz. Severity is medium (CVSS 6.5). wpDiscuz before 7.6.47 contains a missing rate limiting vulnerability that allows unauthenticated attackers to subscribe arbitrary email addresses to post notifications by sending POST requests to the wpdAddSubscription handler in class.Wpd

Q: How urgent is CVE-2026-22216?

Priority 34/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 6.5REMOTEUPGRADE

CVE-2026-22216 is a medium-severity flaw (CVSS 6.5) affecting wpdiscuz. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

wpDiscuz before 7.6.47 contains a missing rate limiting vulnerability that allows unauthenticated attackers to subscribe arbitrary email addresses to post notifications by sending POST requests to the wpdAddSubscription handler in class.WpdiscuzHelperAjax.php. Attackers can exploit LIKE wildcard characters in the subscription query to match multiple email addresses and generate unwanted notification emails to victim accounts.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-799
Published	2026-03-13
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: gvectors

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

Am I affected?

Timeline

2026-03-13 19:54 UTCPublished CVE record published
2026-06-17 10:19 UTCUpdated Record last modified

gvectors wpdiscuz UPGRADE

Affected: < 7.6.47

Fixed in: 7.6.47

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy wpdiscuz || rpm -q wpdiscuz || wpdiscuz --version

2. UPGRADE to 7.6.47 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade wpdiscuz

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade wpdiscuz

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-2026-22216?

wpdiscuz: upgrade to 7.6.47. Exact commands for each OS are on this page.

Is CVE-2026-22216 being exploited?

CVE-2026-22216 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-2026-22216 affect?

CVE-2026-22216 affects wpdiscuz. Severity is medium (CVSS 6.5). wpDiscuz before 7.6.47 contains a missing rate limiting vulnerability that allows unauthenticated attackers to subscribe arbitrary email addresses to post notifications by sending POST requests to the wpdAddSubscription handler in class.Wpd

How urgent is CVE-2026-22216?

Priority 34/100. Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

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References

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