CVE-2021-3164: ChurchRota 2.6.4 is vulnerable to authenticated remote code execution

This month

HIGH 8.8DOWNGRADE

CVE-2021-3164 is a high-severity flaw (CVSS 8.8) affecting churchrota. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ChurchRota 2.6.4 is vulnerable to authenticated remote code execution. The user does not need to have file upload permission in order to upload and execute an arbitrary file via a POST request to resources.php.

Why this priority

High severity
EPSS top 9%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	4.2% (top 9%)
CISA exploited list	No
Weakness	CWE-434
Published	2021-01-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: churchdesk

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

Am I affected?

Timeline

2021-01-26 18:16 UTCPublished CVE record published
2026-06-17 04:04 UTCUpdated Record last modified

churchdesk churchrota DOWNGRADE

Affected: 2.6.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.6.4

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.6.4 (Debian / Ubuntu)

apt-cache madison churchrota sudo apt install churchrota=<VERSION_BEFORE_2.6.4> sudo apt-mark hold churchrota

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

dnf --showduplicates list churchrota sudo dnf downgrade churchrota-<VERSION_BEFORE_2.6.4> sudo dnf versionlock add churchrota

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-2021-3164?

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

Is CVE-2021-3164 being exploited?

CVE-2021-3164 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-2021-3164 affect?

CVE-2021-3164 affects churchrota. Severity is high (CVSS 8.8). ChurchRota 2.6.4 is vulnerable to authenticated remote code execution. The user does not need to have file upload permission in order to upload and execute an arbitrary file via a POST request to resources.php.

How urgent is CVE-2021-3164?

Priority 59/100. High severity; EPSS top 9%: very likely to be exploited; Public exploit reference

Software pages

PHP vulnerabilities

References

← Back to latest CVEs