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Vulnerability record · CVE-2025-15099 · published 26 December 2025

CVE-2025-15099: Sim improper authentication vulnerability

Sim · Sim

A vulnerability was identified in simstudioai sim up to 0.5.27. This vulnerability affects unknown code of the file apps/sim/lib/auth/internal.ts of the component CRON Secret Handler. The manipulation of the argument INTERNAL_API_SECRET leads to improper authentication. It is possible to initiate the attack remotely. The exploit is publicly available and might be used. The identifier of the patch is e359dc2946b12ed5e45a0ec9c95ecf91bd18502a. Applying a patch is the recommended action to fix this issue.

5.5 CVSS 4.0 Medium EPSS 0.79% · top 45.6% CWE-287 · Improper authentication
5.5CVSS 4.0 base score, v2 7.5
0.79%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

A vulnerability was identified in simstudioai sim up to 0.5.27. This vulnerability affects unknown code of the file apps/sim/lib/auth/internal.ts of the component CRON Secret Handler. The manipulation of the argument INTERNAL_API_SECRET leads to improper authentication. It is possible to initiate the attack remotely. The exploit is publicly available and might be used. The identifier of the patch is e359dc2946b12ed5e45a0ec9c95ecf91bd18502a. Applying a patch is the recommended action to fix this issue.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://gist.github.com/H2u8s/c533741e1b36f6245d41cace89a7f4d2 ExploitThird Party Advisory
https://gist.github.com/H2u8s/c533741e1b36f6245d41cace89a7f4d2#-steps-to-reproduce ExploitThird Party Advisory
https://github.com/simstudioai/sim/commit/e359dc2946b12ed5e45a0ec9c95ecf91bd18502a Patch
https://github.com/simstudioai/sim/pull/2343 ExploitIssue Tracking
https://vuldb.com/?ctiid.338430 Permissions RequiredVDB Entry
https://vuldb.com/?id.338430 Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.710255 Third Party AdvisoryVDB Entry
https://gist.github.com/H2u8s/c533741e1b36f6245d41cace89a7f4d2#-steps-to-reproduce ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-3431Sim missing authorization vulnerabilityOn SimStudio version below to 0.5.74, the MongoDB tool endpoints accept arbitrary connection parameters from the caller without authentication or hos…EPSS 0.61%9.3CVE-2026-3432Sim missing authorization vulnerabilityOn SimStudio version below to 0.5.74, the `/api/auth/oauth/token` endpoint contains a code path that bypasses all authorization checks when provided …EPSS 0.45%5.5CVE-2025-7114Sim improper authentication vulnerabilityA vulnerability was found in SimStudioAI sim up to 37786d371e17d35e0764e1b5cd519d873d90d97b. It has been declared as critical. Affected by this vulne…EPSS 0.52%5.5CVE-2025-7107Sim path traversal vulnerabilityA vulnerability classified as critical has been found in SimStudioAI sim up to 0.1.17. Affected is the function handleLocalFile of the file apps/sim/…EPSS 0.79%5.3CVE-2025-10097Sim injection vulnerabilityA vulnerability was identified in SimStudioAI sim up to 1.0.0. This impacts an unknown function of the file apps/sim/app/api/function/execute/route.t…EPSS 0.76%2.1CVE-2025-10096Sim server-side request forgery (ssrf) vulnerabilityA vulnerability was determined in SimStudioAI sim up to 1.0.0. This affects an unknown function of the file apps/sim/app/api/files/parse/route.ts. Ex…EPSS 0.28%2.1CVE-2025-9805Sim server-side request forgery (ssrf) vulnerabilityA vulnerability was found in SimStudioAI sim up to 51b1e97fa22c48d144aef75f8ca31a74ad2cfed2. This issue affects some unknown processing of the file a…EPSS 0.29%2.1CVE-2025-9800Sim improper access control vulnerabilityA weakness has been identified in SimStudioAI sim up to ed9b9ad83f1a7c61f4392787fb51837d34eeb0af. Affected by this issue is the function Import of th…EPSS 0.32%

Source: NIST National Vulnerability Database (record CVE-2025-15099), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.