CVE-2018-3815: The "XML Interface to Messaging, Scheduling, and Signaling" (XIMSS) protocol implementation in CommuniGate Pro

This month

MEDIUM 5.7DOWNGRADE

CVE-2018-3815 is a medium-severity flaw (CVSS 5.7) affecting communigate pro. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The "XML Interface to Messaging, Scheduling, and Signaling" (XIMSS) protocol implementation in CommuniGate Pro (CGP) 6.2 suffers from a Missing XIMSS Protocol Validation attack that leads to an email spoofing attack, allowing a malicious authenticated attacker to send a message from any source email address. The attack uses an HTTP POST request to a /Session URI, and interchanges the XML From and To elements.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.7 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-287
Published	2018-01-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: stalker

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

Am I affected?

Timeline

2018-01-08 05:29 UTCPublished CVE record published
2026-06-17 01:57 UTCUpdated Record last modified

stalker communigate pro DOWNGRADE

Affected: 6.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.2

1. Check installed version

apt-cache policy communigate-pro || rpm -q communigate-pro || communigate-pro --version

2. No fixed release: DOWNGRADE to a release before 6.2 (Debian / Ubuntu)

apt-cache madison communigate-pro sudo apt install communigate-pro=<VERSION_BEFORE_6.2> sudo apt-mark hold communigate-pro

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

dnf --showduplicates list communigate-pro sudo dnf downgrade communigate-pro-<VERSION_BEFORE_6.2> sudo dnf versionlock add communigate-pro

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-2018-3815?

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

Is CVE-2018-3815 being exploited?

CVE-2018-3815 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-2018-3815 affect?

CVE-2018-3815 affects communigate pro. Severity is medium (CVSS 5.7). The "XML Interface to Messaging, Scheduling, and Signaling" (XIMSS) protocol implementation in CommuniGate Pro (CGP) 6.2 suffers from a Missing XIMSS Protocol Validation attack that leads to an email spoofing attack, allowing a malicious au

How urgent is CVE-2018-3815?

Priority 40/100. Public exploit reference

Related CVEs

CVE-2018-18621 MEDIUM 6.1 DOWNGRADE CommuniGate Pro 6.2 allows stored XSS via a message body in Pronto! Mail Composer, which is mishandled in /MIM
CVE-2017-16962 MEDIUM 6.1 UPGRADE The WebMail components (Crystal, pronto, and pronto4) in CommuniGate Pro before 6.2.1 have stored XSS vulnerab

References

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