CVE-2026-33656: EspoCRM is an open source customer relationship management application

Q: How do I fix CVE-2026-33656?

espocrm: upgrade to 9.3.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-33656 being exploited?

CVE-2026-33656 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-2026-33656 affect?

CVE-2026-33656 affects espocrm. Severity is critical (CVSS 9.1). EspoCRM is an open source customer relationship management application. Prior to version 9.3.4, EspoCRM's built-in formula scripting engine allowing updating attachment's sourceId thus allowing an authenticated admin to overwrite the `sourc

Q: How urgent is CVE-2026-33656?

Priority 48/100. Critical severity; Public exploit reference

This month

CRITICAL 9.1UPGRADE

CVE-2026-33656 is a critical-severity flaw (CVSS 9.1) affecting espocrm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

EspoCRM is an open source customer relationship management application. Prior to version 9.3.4, EspoCRM's built-in formula scripting engine allowing updating attachment's sourceId thus allowing an authenticated admin to overwrite the `sourceId` field on `Attachment` entities. Because `sourceId` is concatenated directly into a file path with no sanitization in `EspoUploadDir::getFilePath()`, an attacker can redirect any file read or write operatio

Why this priority

Critical severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-04-22
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: espocrm

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

Am I affected?

Timeline

2026-04-22 21:17 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

espocrm espocrm UPGRADE

Affected: < 9.3.4

Fixed in: 9.3.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 9.3.4 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade espocrm

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2026-33656?

espocrm: upgrade to 9.3.4. Exact commands for each OS are on this page.

Is CVE-2026-33656 being exploited?

CVE-2026-33656 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-2026-33656 affect?

CVE-2026-33656 affects espocrm. Severity is critical (CVSS 9.1). EspoCRM is an open source customer relationship management application. Prior to version 9.3.4, EspoCRM's built-in formula scripting engine allowing updating attachment's sourceId thus allowing an authenticated admin to overwrite the `sourc

How urgent is CVE-2026-33656?

Priority 48/100. Critical severity; Public exploit reference

Related CVEs

CVE-2026-33740 MEDIUM 5.4 UPGRADE EspoCRM is an open source customer relationship management application
CVE-2026-33733 HIGH 7.2 UPGRADE EspoCRM is an open source customer relationship management application
CVE-2026-33659 LOW 3.5 UPGRADE EspoCRM is an open source customer relationship management application
CVE-2026-33657 MEDIUM 4.6 UPGRADE EspoCRM is an open source customer relationship management application
CVE-2026-33534 MEDIUM 4.3 UPGRADE EspoCRM is an open source customer relationship management application

References

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