How severe is CVE-2025-9800?

CVE-2025-9800 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2025-9800 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-9800?

CVE-2025-9800 affects Sim. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-9800?

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

Does CVE-2025-9800 have an EU (EUVD) identifier?

Yes. CVE-2025-9800 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-26365.

When was CVE-2025-9800 published?

CVE-2025-9800 was published on 2025-09-01 and last updated on 2026-06-17.

CVE-2025-9800

CVE-2025-9800 is a medium-severity vulnerability in Sim with a CVSS 3.x base score of 6.3. 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-434.

Key facts

Severity: Medium (CVSS 3.x base score 6.3)
CVSS v2: 6.5
CVSS v4: 2.1
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-26365
Weakness: CWE-434
Affected product: Sim
Published: 2025-09-01
Last modified: 2026-06-17

Description

A weakness has been identified in SimStudioAI sim up to ed9b9ad83f1a7c61f4392787fb51837d34eeb0af. Affected by this issue is the function Import of the file apps/sim/app/api/files/upload/route.ts of the component HTML File Parser. Executing manipulation of the argument File can lead to unrestricted upload. The attack may be launched remotely. The exploit has been made available to the public and could be exploited. This product operates on a rolling release basis, ensuring continuous delivery. Consequently, there are no version details for either affected or updated releases. This patch is called 45372aece5e05e04b417442417416a52e90ba174. A patch should be applied to remediate this issue.

Frequently asked questions

What is CVE-2025-9800?: A weakness has been identified in SimStudioAI sim up to ed9b9ad83f1a7c61f4392787fb51837d34eeb0af. Affected by this issue is the function Import of the file apps/sim/app/api/files/upload/route.ts of the component HTML File Parser. Executing manipulation of the argument File can lead to unrestricted upload. The attack may be launched remotely. The exploit has been made available to the public and could be exploited. This product operates on a rolling release basis, ensuring continuous delivery. Consequently, there are no version details for either affected or updated releases. This patch is called 45372aece5e05e04b417442417416a52e90ba174. A patch should be applied to remediate this issue.
How severe is CVE-2025-9800?: CVE-2025-9800 has a CVSS 3.x base score of 6.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2025-9800 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-9800?: CVE-2025-9800 affects Sim. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-9800?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-9800 have an EU (EUVD) identifier?: Yes. CVE-2025-9800 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-26365.
When was CVE-2025-9800 published?: CVE-2025-9800 was published on 2025-09-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sim:sim:*:*:*:*:*:*:*:*

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