CVE-2023-27507: MicroEngine Mailform version 1.1.0 to 1.1.8 contains a path traversal vulnerability

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2023-27507 is a critical-severity flaw (CVSS 9.8) affecting mailform. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MicroEngine Mailform version 1.1.0 to 1.1.8 contains a path traversal vulnerability. If the product's file upload function and server save option are enabled, a remote attacker may save an arbitrary file on the server and execute it.

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	1.3% (top 30%)
CISA exploited list	No
Weakness	CWE-22
Published	2023-05-23
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: microengine

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

Am I affected?

Timeline

2023-05-23 02:15 UTCPublished CVE record published
2026-06-17 05:45 UTCUpdated Record last modified

microengine mailform UPGRADE

Affected: >= 1.1.0 and < 1.1.9

Fixed in: 1.1.9

Safe to downgrade to: a release before 1.1.0

1. Check installed version

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

2. UPGRADE to 1.1.9 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mailform

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 1.1.0 (Debian / Ubuntu)

apt-cache madison mailform sudo apt install mailform=<VERSION_BEFORE_1.1.0> sudo apt-mark hold mailform

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

dnf --showduplicates list mailform sudo dnf downgrade mailform-<VERSION_BEFORE_1.1.0> sudo dnf versionlock add mailform

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-2023-27507?

mailform: upgrade to 1.1.9. Exact commands for each OS are on this page.

Is CVE-2023-27507 being exploited?

CVE-2023-27507 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-2023-27507 affect?

CVE-2023-27507 affects mailform. Severity is critical (CVSS 9.8). MicroEngine Mailform version 1.1.0 to 1.1.8 contains a path traversal vulnerability. If the product's file upload function and server save option are enabled, a remote attacker may save an arbitrary file on the server and execute it.

How urgent is CVE-2023-27507?

Priority 57/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-27397 CRITICAL 9.8 UPGRADE Unrestricted upload of file with dangerous type exists in MicroEngine Mailform version 1.1.0 to 1.1.8

References

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