How severe is CVE-2026-33656?

CVE-2026-33656 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-33656 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33656?

CVE-2026-33656 affects Espocrm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33656?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-33656 have an EU (EUVD) identifier?

Yes. CVE-2026-33656 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25081.

When was CVE-2026-33656 published?

CVE-2026-33656 was published on 2026-04-22 and last updated on 2026-06-17.

CVE-2026-33656

CVE-2026-33656 is a critical-severity vulnerability in Espocrm with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 0% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25081
Weakness: CWE-22
Affected product: Espocrm
Published: 2026-04-22
Last modified: 2026-06-17

Description

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 operation to an arbitrary path within the web server's `open_basedir` scope. Version 9.3.4 fixes the issue.

Frequently asked questions

What is CVE-2026-33656?: 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 operation to an arbitrary path within the web server's `open_basedir` scope. Version 9.3.4 fixes the issue.
How severe is CVE-2026-33656?: CVE-2026-33656 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-33656 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33656?: CVE-2026-33656 affects Espocrm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33656?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-33656 have an EU (EUVD) identifier?: Yes. CVE-2026-33656 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25081.
When was CVE-2026-33656 published?: CVE-2026-33656 was published on 2026-04-22 and last updated on 2026-06-17.

References

https://github.com/espocrm/espocrm/security/advisories/GHSA-7922-x7cf-j54x

Affected products (1)

cpe:2.3:a:espocrm:espocrm:*:*:*:*:*:*:*:*

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