How severe is CVE-2026-44729?

CVE-2026-44729 has a CVSS 3.x base score of 8.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-44729 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-44729?

CVE-2026-44729 affects Twenty. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-44729?

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

Does CVE-2026-44729 have an EU (EUVD) identifier?

Yes. CVE-2026-44729 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31895.

When was CVE-2026-44729 published?

CVE-2026-44729 was published on 2026-05-26 and last updated on 2026-06-17.

CVE-2026-44729

CVE-2026-44729 is a high-severity vulnerability in Twenty with a CVSS 3.x base score of 8.7. 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-79.

Key facts

Severity: High (CVSS 3.x base score 8.7)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31895
Weakness: CWE-79
Affected product: Twenty
Published: 2026-05-26
Last modified: 2026-06-17

Description

Twenty is an open source CRM. In 1.18.0 and earlier, the file serving endpoints in Twenty CRM at /files/* and /file/:fileFolder/:id serve uploaded files using fileStream.pipe(res) without setting any Content-Type, Content-Disposition, or X-Content-Type-Options response headers. This allows an authenticated attacker to upload an HTML file containing JavaScript, which will be rendered by the victim's browser in the context of the Twenty CRM domain when accessed — enabling session hijacking, account takeover, and data theft.

Frequently asked questions

What is CVE-2026-44729?: Twenty is an open source CRM. In 1.18.0 and earlier, the file serving endpoints in Twenty CRM at /files/* and /file/:fileFolder/:id serve uploaded files using fileStream.pipe(res) without setting any Content-Type, Content-Disposition, or X-Content-Type-Options response headers. This allows an authenticated attacker to upload an HTML file containing JavaScript, which will be rendered by the victim's browser in the context of the Twenty CRM domain when accessed — enabling session hijacking, account takeover, and data theft.
How severe is CVE-2026-44729?: CVE-2026-44729 has a CVSS 3.x base score of 8.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-44729 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-44729?: CVE-2026-44729 affects Twenty. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-44729?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-44729 have an EU (EUVD) identifier?: Yes. CVE-2026-44729 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31895.
When was CVE-2026-44729 published?: CVE-2026-44729 was published on 2026-05-26 and last updated on 2026-06-17.

References

https://github.com/twentyhq/twenty/security/advisories/GHSA-f5h2-3qw5-3qp7

Affected products (1)

cpe:2.3:a:twenty:twenty:*:*:*:*:*:*:*:*

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