CVE-2021-36431: SQL injection vulnerability in jocms 0.8 allows remote attackers to run arbitrary SQL commands and view sentiv

This week

CRITICAL 9.1REMOTEDOWNGRADE

CVE-2021-36431 is a critical-severity flaw (CVSS 9.1) affecting jocms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SQL injection vulnerability in jocms 0.8 allows remote attackers to run arbitrary SQL commands and view sentivie information via jo_json_check() function in jocms/apps/mask/inc/mask.php.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-89
Published	2023-02-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: jocms project

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

Am I affected?

Timeline

2023-02-03 18:15 UTCPublished CVE record published
2026-06-17 03:58 UTCUpdated Record last modified

jocms project jocms DOWNGRADE

Affected: 0.8

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.8

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.8 (Debian / Ubuntu)

apt-cache madison jocms sudo apt install jocms=<VERSION_BEFORE_0.8> sudo apt-mark hold jocms

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

dnf --showduplicates list jocms sudo dnf downgrade jocms-<VERSION_BEFORE_0.8> sudo dnf versionlock add jocms

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-2021-36431?

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

Is CVE-2021-36431 being exploited?

CVE-2021-36431 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-2021-36431 affect?

CVE-2021-36431 affects jocms. Severity is critical (CVSS 9.1). SQL injection vulnerability in jocms 0.8 allows remote attackers to run arbitrary SQL commands and view sentivie information via jo_json_check() function in jocms/apps/mask/inc/mask.php.

How urgent is CVE-2021-36431?

Priority 56/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

CVE-2021-36434 CRITICAL 9.1 DOWNGRADE SQL injection vulnerability in jocms 0.8 allows remote attackers to run arbitrary SQL commands and view sentiv
CVE-2021-36433 CRITICAL 9.1 DOWNGRADE SQL injection vulnerability in jocms 0.8 allows remote attackers to run arbitrary SQL commands and view sentiv
CVE-2021-36432 HIGH 7.5 DOWNGRADE SQL injection vulnerability in jocms 0.8 allows remote attackers to run arbitrary SQL commands and view sentiv

References

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