CVE-2025-6688: The Simple Payment plugin for WordPress is vulnerable to Authentication Bypass in versions 1.3.6 to 2.3.8

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2025-6688 is a critical-severity flaw (CVSS 9.8) affecting simple payment. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Simple Payment plugin for WordPress is vulnerable to Authentication Bypass in versions 1.3.6 to 2.3.8. This is due to the plugin not properly verifying a user's identity prior to logging them in through the create_user() function. This makes it possible for unauthenticated attackers to log in as administrative users.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-288
Published	2025-06-27
Last modified	2026-06-17

Publisher (CNA): Wordfence · Vendor: idokd

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

Am I affected?

Timeline

2025-06-27 08:15 UTCPublished CVE record published
2026-06-17 10:02 UTCUpdated Record last modified

idokd simple payment UPGRADE

Affected: >= 1.3.6 and < 2.3.9

Fixed in: 2.3.9

Safe to downgrade to: a release before 1.3.6

1. Check installed version

apt-cache policy simple-payment || rpm -q simple-payment || simple-payment --version

2. UPGRADE to 2.3.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade simple-payment

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade simple-payment

Note

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

3. If no update is available yet, DOWNGRADE to a release before 1.3.6 (Debian / Ubuntu)

apt-cache madison simple-payment sudo apt install simple-payment=<VERSION_BEFORE_1.3.6> sudo apt-mark hold simple-payment

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list simple-payment sudo dnf downgrade simple-payment-<VERSION_BEFORE_1.3.6> sudo dnf versionlock add simple-payment

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-2025-6688?

simple payment: upgrade to 2.3.9. Exact commands for each OS are on this page.

Is CVE-2025-6688 being exploited?

CVE-2025-6688 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-2025-6688 affect?

CVE-2025-6688 affects simple payment. Severity is critical (CVSS 9.8). The Simple Payment plugin for WordPress is vulnerable to Authentication Bypass in versions 1.3.6 to 2.3.8. This is due to the plugin not properly verifying a user's identity prior to logging them in through the create_user() function. This

How urgent is CVE-2025-6688?

Priority 50/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

WordPress vulnerabilities

References

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