CVE-2018-5955: An issue was discovered in GitStack through 2.3.10

Q: How do I fix CVE-2018-5955?

gitstack: upgrade to newer than 2.3.10. Exact commands for each OS are on this page.

Q: Is CVE-2018-5955 being exploited?

CVE-2018-5955 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-2018-5955 affect?

CVE-2018-5955 affects gitstack. Severity is critical (CVSS 9.8). An issue was discovered in GitStack through 2.3.10. User controlled input is not sufficiently filtered, allowing an unauthenticated attacker to add a user to the server via the username and password fields to the rest/user/ URI.

Q: How urgent is CVE-2018-5955?

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-2018-5955 is a critical-severity flaw (CVSS 9.8) affecting gitstack. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in GitStack through 2.3.10. User controlled input is not sufficiently filtered, allowing an unauthenticated attacker to add a user to the server via the username and password fields to the rest/user/ URI.

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	81.4% (top 1%)
CISA exploited list	No
Weakness	CWE-20
Published	2018-01-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: smartmobilesoftware

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

Am I affected?

Timeline

2018-01-21 22:29 UTCPublished CVE record published
2026-06-17 02:01 UTCUpdated Record last modified

smartmobilesoftware gitstack UPGRADE

Affected: <= 2.3.10

Fixed in: newer than 2.3.10

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.3.10 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade gitstack

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.

Exploit-DB: GitStack - Remote Code Execution
Exploit-DB: GitStack - Unsanitized Argument Remote Code Execution (Metasploit)
Metasploit: GitStack Unauthenticated REST API Requests
Metasploit: GitStack Unsanitized Argument RCE

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-2018-5955?

gitstack: upgrade to newer than 2.3.10. Exact commands for each OS are on this page.

Is CVE-2018-5955 being exploited?

CVE-2018-5955 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-2018-5955 affect?

CVE-2018-5955 affects gitstack. Severity is critical (CVSS 9.8). An issue was discovered in GitStack through 2.3.10. User controlled input is not sufficiently filtered, allowing an unauthenticated attacker to add a user to the server via the username and password fields to the rest/user/ URI.

How urgent is CVE-2018-5955?

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

References

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