CVE-2018-11248: util/FileDownloadUtils.java in FileDownloader 1.7.3 does not check an attachment's name

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2018-11248 is a critical-severity flaw (CVSS 9.8) affecting filedownloader. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

util/FileDownloadUtils.java in FileDownloader 1.7.3 does not check an attachment's name. If an attacker places "../" in the file name, the file can be stored in an unintended directory because of Directory Traversal.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.6% (top 25%)
CISA exploited list	No
Weakness	CWE-22
Published	2018-05-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: liulishuo

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

Am I affected?

Timeline

2018-05-18 18:29 UTCPublished CVE record published
2026-06-17 01:35 UTCUpdated Record last modified

liulishuo filedownloader DOWNGRADE

Affected: 1.7.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.7.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.7.3 (Debian / Ubuntu)

apt-cache madison filedownloader sudo apt install filedownloader=<VERSION_BEFORE_1.7.3> sudo apt-mark hold filedownloader

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

dnf --showduplicates list filedownloader sudo dnf downgrade filedownloader-<VERSION_BEFORE_1.7.3> sudo dnf versionlock add filedownloader

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-2018-11248?

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

Is CVE-2018-11248 being exploited?

CVE-2018-11248 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-2018-11248 affect?

CVE-2018-11248 affects filedownloader. Severity is critical (CVSS 9.8). util/FileDownloadUtils.java in FileDownloader 1.7.3 does not check an attachment's name. If an attacker places "../" in the file name, the file can be stored in an unintended directory because of Directory Traversal.

How urgent is CVE-2018-11248?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action

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References

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