CVE-2019-18952: SibSoft Xfilesharing through 2.5.1 allows cgi-bin/up.cgi arbitrary file upload

Q: How do I fix CVE-2019-18952?

xfilesharing: upgrade to newer than 2.5.1. Exact commands for each OS are on this page.

Q: Is CVE-2019-18952 being exploited?

CVE-2019-18952 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-2019-18952 affect?

CVE-2019-18952 affects xfilesharing. Severity is critical (CVSS 9.8). SibSoft Xfilesharing through 2.5.1 allows cgi-bin/up.cgi arbitrary file upload. This can be combined with CVE-2019-18951 to achieve remote code execution via a .html file, containing short codes, that is served over HTTP.

Q: How urgent is CVE-2019-18952?

Priority 69/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2019-18952 is a critical-severity flaw (CVSS 9.8) affecting xfilesharing. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SibSoft Xfilesharing through 2.5.1 allows cgi-bin/up.cgi arbitrary file upload. This can be combined with CVE-2019-18951 to achieve remote code execution via a .html file, containing short codes, that is served over HTTP.

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference
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	44.4% (top 1%)
CISA exploited list	No
Weakness	CWE-434
Published	2019-11-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sibsoft

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

Am I affected?

Timeline

2019-11-13 23:15 UTCPublished CVE record published
2026-06-17 02:25 UTCUpdated Record last modified

sibsoft xfilesharing UPGRADE

Affected: <= 2.5.1

Fixed in: newer than 2.5.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.5.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade xfilesharing

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

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

Nuclei scan template: Xfilesharing 2.5.1 - Arbitrary File Upload

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-2019-18952?

xfilesharing: upgrade to newer than 2.5.1. Exact commands for each OS are on this page.

Is CVE-2019-18952 being exploited?

CVE-2019-18952 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-2019-18952 affect?

CVE-2019-18952 affects xfilesharing. Severity is critical (CVSS 9.8). SibSoft Xfilesharing through 2.5.1 allows cgi-bin/up.cgi arbitrary file upload. This can be combined with CVE-2019-18951 to achieve remote code execution via a .html file, containing short codes, that is served over HTTP.

How urgent is CVE-2019-18952?

Priority 69/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2019-18951 HIGH 7.5 UPGRADE SibSoft Xfilesharing through 2.5.1 allows op=page&tmpl=../ directory traversal to read arbitrary files.

References

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