CVE-2018-12988: GreenCMS 2.3.0603 has an arbitrary file download vulnerability via an index.php?m=admin&c=media&a=downfile URI

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2018-12988 is a high-severity flaw (CVSS 7.5) affecting greencms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

GreenCMS 2.3.0603 has an arbitrary file download vulnerability via an index.php?m=admin&c=media&a=downfile URI.

Why this priority

High severity
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	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-20
Published	2018-06-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: greencms

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

Am I affected?

Timeline

2018-06-29 05:29 UTCPublished CVE record published
2026-06-17 01:38 UTCUpdated Record last modified

greencms greencms DOWNGRADE

Affected: 2.3.0603

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.3.0603

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.3.0603 (Debian / Ubuntu)

apt-cache madison greencms sudo apt install greencms=<VERSION_BEFORE_2.3.0603> sudo apt-mark hold greencms

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

dnf --showduplicates list greencms sudo dnf downgrade greencms-<VERSION_BEFORE_2.3.0603> sudo dnf versionlock add greencms

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-2018-12988?

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

Is CVE-2018-12988 being exploited?

CVE-2018-12988 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-2018-12988 affect?

CVE-2018-12988 affects greencms. Severity is high (CVSS 7.5). GreenCMS 2.3.0603 has an arbitrary file download vulnerability via an index.php?m=admin&c=media&a=downfile URI.

How urgent is CVE-2018-12988?

Priority 55/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2025-14244 LOW 2.4 DOWNGRADE A flaw has been found in GreenCMS 2.3.0603
CVE-2025-15187 LOW 3.8 UPGRADE A vulnerability was found in GreenCMS up to 2.3
CVE-2025-9415 MEDIUM 6.3 UPGRADE A vulnerability was identified in GreenCMS up to 2.3.0603
CVE-2024-22570 MEDIUM 5.4 DOWNGRADE A stored cross-site scripting (XSS) vulnerability in /install.php?m=install&c=index&a=step3 of GreenCMS v2.3 a
CVE-2022-28918 HIGH 8.1 DOWNGRADE GreenCMS v2.3.0603 was discovered to contain an arbitrary file deletion vulnerability via /index.php?m=admin&c

References

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