How severe is CVE-2026-5026?

CVE-2026-5026 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-5026 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5026?

CVE-2026-5026 affects Langflow. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-5026?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-5026 have an EU (EUVD) identifier?

Yes. CVE-2026-5026 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16666.

When was CVE-2026-5026 published?

CVE-2026-5026 was published on 2026-03-27 and last updated on 2026-06-17.

CVE-2026-5026

CVE-2026-5026 is a medium-severity vulnerability in Langflow with a CVSS 3.x base score of 5.4. 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: Medium (CVSS 3.x base score 5.4)
CVSS v4: 7.0
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16666
Weakness: CWE-79
Affected product: Langflow
Published: 2026-03-27
Last modified: 2026-06-17

Description

The '/api/v1/files/images/{flow_id}/{file_name}' endpoint serves SVG files with the 'image/svg+xml' content type without sanitizing their content. Since SVG files can contain embedded JavaScript, an attacker can upload a malicious SVG that executes arbitrary JavaScript when viewed by other users, leading to stored cross-site scripting (XSS). This allows stealing authentication tokens stored in cookies, including JWT access and refresh tokens.

Frequently asked questions

What is CVE-2026-5026?: The '/api/v1/files/images/{flow_id}/{file_name}' endpoint serves SVG files with the 'image/svg+xml' content type without sanitizing their content. Since SVG files can contain embedded JavaScript, an attacker can upload a malicious SVG that executes arbitrary JavaScript when viewed by other users, leading to stored cross-site scripting (XSS). This allows stealing authentication tokens stored in cookies, including JWT access and refresh tokens.
How severe is CVE-2026-5026?: CVE-2026-5026 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-5026 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5026?: CVE-2026-5026 affects Langflow. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-5026?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-5026 have an EU (EUVD) identifier?: Yes. CVE-2026-5026 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16666.
When was CVE-2026-5026 published?: CVE-2026-5026 was published on 2026-03-27 and last updated on 2026-06-17.

References

https://www.tenable.com/security/research/tra-2026-25

Affected products (1)

cpe:2.3:a:langflow:langflow:-:*:*:*:*:*:*:*

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