CVE-2020-7356: CAYIN xPost suffers from an unauthenticated SQL Injection vulnerability

This week

CRITICAL 10.0REMOTEDOWNGRADE

CVE-2020-7356 is a critical-severity flaw (CVSS 10.0) affecting xpost. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CAYIN xPost suffers from an unauthenticated SQL Injection vulnerability. Input passed via the GET parameter 'wayfinder_seqid' in wayfinder_meeting_input.jsp is not properly sanitized before being returned to the user or used in SQL queries. This can be exploited to manipulate SQL queries by injecting arbitrary SQL code and execute SYSTEM commands.

Why this priority

Critical severity
EPSS top 3%: 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	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	14.0% (top 3%)
CISA exploited list	No
Weakness	CWE-89
Published	2020-08-06
Last modified	2026-06-17

Publisher (CNA): Rapid7, Inc. · Vendor: cayintech

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

Am I affected?

Timeline

2020-08-06 16:15 UTCPublished CVE record published
2026-06-17 03:24 UTCUpdated Record last modified

cayintech xpost DOWNGRADE

Affected: 1.0 · 2.0 · 2.5.18103

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison xpost sudo apt install xpost=<VERSION_BEFORE_1.0> sudo apt-mark hold xpost

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

dnf --showduplicates list xpost sudo dnf downgrade xpost-<VERSION_BEFORE_1.0> sudo dnf versionlock add xpost

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · root · FIXED · 6.40.04-7.fc46 · FEDORA-2026-7329868400 · source

sudo dnf upgrade --advisory=FEDORA-2026-7329868400

Public exploits and detection

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

Write-up: www.zeroscience.mk/en/vulnerabilities/ZSL-2020-5571.php
Metasploit: Cayin xPost wayfinder_seqid SQLi to 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-2020-7356?

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

Is CVE-2020-7356 being exploited?

CVE-2020-7356 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-2020-7356 affect?

CVE-2020-7356 affects xpost. Severity is critical (CVSS 10.0). CAYIN xPost suffers from an unauthenticated SQL Injection vulnerability. Input passed via the GET parameter 'wayfinder_seqid' in wayfinder_meeting_input.jsp is not properly sanitized before being returned to the user or used in SQL queries.

How urgent is CVE-2020-7356?

Priority 69/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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