CVE-2023-39967: WireMock is a tool for mocking HTTP services

Q: How do I fix CVE-2023-39967?

studio: upgrade to newer than 2.32.0-17. Exact commands for each OS are on this page.

Q: Is CVE-2023-39967 being exploited?

CVE-2023-39967 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-2023-39967 affect?

CVE-2023-39967 affects studio. Severity is critical (CVSS 10.0). WireMock is a tool for mocking HTTP services. When certain request URLs like “@127.0.0.1:1234" are used in WireMock Studio configuration fields, the request might be forwarded to an arbitrary service reachable from WireMock’s instance. Ther

Q: How urgent is CVE-2023-39967?

Priority 61/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 10.0REMOTEUPGRADE

CVE-2023-39967 is a critical-severity flaw (CVSS 10.0) affecting studio. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

WireMock is a tool for mocking HTTP services. When certain request URLs like “@127.0.0.1:1234" are used in WireMock Studio configuration fields, the request might be forwarded to an arbitrary service reachable from WireMock’s instance. There are 3 identified potential attack vectors: via “TestRequester” functionality, webhooks and the proxy mode. As we can control HTTP Method, HTTP Headers, HTTP Data, it allows sending requests with the default l

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-918
Published	2023-09-06
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: wiremock

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

Am I affected?

Timeline

2023-09-06 21:15 UTCPublished CVE record published
2026-06-17 06:13 UTCUpdated Record last modified

wiremock studio UPGRADE

Affected: <= 2.32.0-17

Fixed in: newer than 2.32.0-17

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.32.0-17 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade studio

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-2023-39967?

studio: upgrade to newer than 2.32.0-17. Exact commands for each OS are on this page.

Is CVE-2023-39967 being exploited?

CVE-2023-39967 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-2023-39967 affect?

CVE-2023-39967 affects studio. Severity is critical (CVSS 10.0). WireMock is a tool for mocking HTTP services. When certain request URLs like “@127.0.0.1:1234" are used in WireMock Studio configuration fields, the request might be forwarded to an arbitrary service reachable from WireMock’s instance. Ther

How urgent is CVE-2023-39967?

Priority 61/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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