How severe is CVE-2026-42138?

CVE-2026-42138 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-42138 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-42138?

CVE-2026-42138 affects Langgenius Dify. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-42138?

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

Does CVE-2026-42138 have an EU (EUVD) identifier?

Yes. CVE-2026-42138 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27071.

When was CVE-2026-42138 published?

CVE-2026-42138 was published on 2026-05-04 and last updated on 2026-06-17.

CVE-2026-42138

CVE-2026-42138 is a medium-severity vulnerability in Langgenius Dify with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 6.9
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-27071
Weakness: CWE-79
Affected product: Langgenius Dify
Published: 2026-05-04
Last modified: 2026-06-17

Description

Dify is an open-source LLM app development platform. Prior to version 1.13.1, using the method POST /api/files/upload, any unauthenticated user can upload an SVG file with XSS. The method POST /v1/files/upload, which requires authentication through the application API, is also vulnerable. This issue has been patched in version 1.13.1.

Frequently asked questions

What is CVE-2026-42138?: Dify is an open-source LLM app development platform. Prior to version 1.13.1, using the method POST /api/files/upload, any unauthenticated user can upload an SVG file with XSS. The method POST /v1/files/upload, which requires authentication through the application API, is also vulnerable. This issue has been patched in version 1.13.1.
How severe is CVE-2026-42138?: CVE-2026-42138 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-42138 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-42138?: CVE-2026-42138 affects Langgenius Dify. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-42138?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42138 have an EU (EUVD) identifier?: Yes. CVE-2026-42138 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27071.
When was CVE-2026-42138 published?: CVE-2026-42138 was published on 2026-05-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:langgenius:dify:*:*:*:*:*:node.js:*:*

More vulnerabilities in Langgenius Dify

CVE-2025-56157 — Critical (CVSS 9.8): Default credentials in Dify thru 1.5.1. PostgreSQL username and password specified in the docker-compose.yaml file…
CVE-2025-63388 — Critical (CVSS 9.1): A Cross-Origin Resource Sharing (CORS) misconfiguration vulnerability exists in Dify v1.9.1 in the…
CVE-2025-63386 — Critical (CVSS 9.1): A Cross-Origin Resource Sharing (CORS) misconfiguration vulnerability exists in Dify v1.9.1 in the /console/api/setup…
CVE-2025-1796 — High (CVSS 8.8): A vulnerability in langgenius/dify v0.10.1 allows an attacker to take over any account, including administrator…
CVE-2024-12776 — High (CVSS 8.1): In langgenius/dify v0.10.1, the `/forgot-password/resets` endpoint does not verify the password reset code, allowing an…
CVE-2024-12039 — High (CVSS 8.1): langgenius/dify version v0.10.1 contains a vulnerability where there are no limits applied to the number of code guess…

All CVEs affecting Langgenius Dify →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →