CVE-2017-1001000: The register_routes function in wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php in the REST

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2017-1001000 is a high-severity flaw (CVSS 7.5) affecting wordpress. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The register_routes function in wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php in the REST API in WordPress 4.7.x before 4.7.2 does not require an integer identifier, which allows remote attackers to modify arbitrary pages via a request for wp-json/wp/v2/posts followed by a numeric value and a non-numeric value, as demonstrated by the wp-json/wp/v2/posts/123?id=123helloworld URI.

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	84.9% (top 1%)
CISA exploited list	No
Published	2017-04-03
Last modified	2026-06-17

Publisher (CNA): Josh Bressers · Vendor: wordpress

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

Am I affected?

Timeline

2017-04-03 01:59 UTCPublished CVE record published
2026-06-17 00:59 UTCUpdated Record last modified

wordpress wordpress DOWNGRADE

Affected: 4.7 · 4.7.1 · 4.7.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.7

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.7 (Debian / Ubuntu)

apt-cache madison wordpress sudo apt install wordpress=<VERSION_BEFORE_4.7> sudo apt-mark hold wordpress

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

dnf --showduplicates list wordpress sudo dnf downgrade wordpress-<VERSION_BEFORE_4.7> sudo dnf versionlock add wordpress

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Metasploit: WordPress REST API Content Injection

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-2017-1001000?

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

Is CVE-2017-1001000 being exploited?

CVE-2017-1001000 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-2017-1001000 affect?

CVE-2017-1001000 affects wordpress. Severity is high (CVSS 7.5). The register_routes function in wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php in the REST API in WordPress 4.7.x before 4.7.2 does not require an integer identifier, which allows remote attackers to modify arbitrary page

How urgent is CVE-2017-1001000?

Priority 61/100. High severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

WordPress vulnerabilities · PHP vulnerabilities

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References

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