HighCVE-2026-116099

    Fusion Creators Studio SCP Containment Breach Multiplayer: Out-of-bounds Write (CVE-2026-116099)

    Published Last modified Sources: CVE.org

    What is affected, what to do

    A flaw has been found in Fusion Creators Studio SCP Containment Breach Multiplayer up to 1.295. This issue affects the function BlitzBanks of the component Skynet++ Virtual Machine.

    An exploit is publicly available. The available sources name no fixed version. Check the vendor guidance in the references below.

    Affected
    • Fusion Creators Studio SCP Containment Breach Multiplayer eq 1.295..1.295

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    8.8

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    8.8

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: CVE.org

    0.4 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 31.8

    Show all metrics
    Severity
    High
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    82.39 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    PoC (publicly reported)
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    8.8 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    8.8
    CVSS v4

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    2.1
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    0.4 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    31.8
    Elevated — this CVE ranks above at least 10% of all CVEs scored today.
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CISA assessment (SSVC)
    Exploitation: proof of concept · automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 26 October 2026
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-119, CWE-787

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    A flaw has been found in Fusion Creators Studio SCP Containment Breach Multiplayer up to 1.295. This issue affects the function BlitzBanks of the component Skynet++ Virtual Machine. Executing a manipulation can lead to out-of-bounds write. The attack can be executed remotely. The exploit has been published and may be used. Upgrading to version 1.3R is capable of addressing this issue. It is recommended to upgrade the affected component.

    Source: NVD (NIST), cvelistv5

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    Fusion Creators StudioSCP Containment Breach Multiplayer
    • 1.295
    • —
    fcs-exscp\
    • ≤ 1.295
    • —

    Weakness classes (CWE)

    • CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer

      Class

      The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

      Entry at MITRE CWE-119

    • CWE-787Out-of-bounds Write

      Base

      The product writes data past the end, or before the beginning, of the intended buffer.

      Entry at MITRE CWE-787

    Public exploit references

    Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.

    Public exploit references
    Reference tagged as exploitgithub.com (opens in a new tab)PoC (publicly reported)reported, not verified—

    References & sources

    • drbloop.devblog/one-click-remote-code-execution-in-scp-containment-breach-…related, Exploit, Issue tracking, Third-party advisory
    • github.comdrbloop2000/SCP-CBM-RCE/tree/mainExploit, Exploit, Issue tracking
    • steamdb.infopatchnotes/25701366Broken link, Patch, Patch
    • store.steampowered.comnews/app/1782380/view/670629296167978253related, Issue tracking
    • vuldb.comCVE-2026-116099 | CVE Analysis and ReportThird-party advisory, Third-party advisory, Vulnerability database
    • vuldb.comSubmit #1001276 | Fusion Creators Studio SCP: Containment Breach Multiplayer 24934269 Out-of-bounds WriteThird-party advisory, Third-party advisory, Vulnerability database
    • vuldb.comVDB-426167 | Fusion Creators Studio SCP Containment Breach Multiplayer Skynet++ Virtual Machine BlitzBanks out-of-bounds writeVulnerability database, Technical description, Third-party advisory, Vulnerability database
    • vuldb.comVDB-426167 | CTI Indicators (IOB, IOC, IOA)signature, Permissions required, Third-party advisory, Vulnerability database

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Reanalysis by NVDNVD

      CVSS V3.1: AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

      CVSS V3.1: before AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, after —

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      CVSSadded
      —
      AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
      CVSSremoved
      AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
      —

      Source identifier: nvd@nist.gov

    2. Initial analysis by NVDNVD

      Newly listed as affected:
      • Fcs-ex scp (through 1.295)

      CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

      Show 10 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      CVSSadded
      —
      AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
      Product configurationadded
      —
      OR *cpe:2.3:a:fcs-ex:scp:containment_breach_multiplayer:*:*:*:*:*:steam:*:* versions up to (including) 1.295
      Reference typeadded
      —
      VulDB: https://drbloop.dev/blog/one-click-remote-code-execution-in-scp-containment-breach-mutiplayer Types: Exploit, Issue Tracking, Third Party Advisory
      Reference typeadded
      —
      VulDB: https://github.com/drbloop2000/SCP-CBM-RCE/tree/main Types: Exploit, Issue Tracking
      Reference typeadded
      —
      VulDB: https://steamdb.info/patchnotes/25701366/ Types: Patch
      Reference typeadded
      —
      VulDB: https://store.steampowered.com/news/app/1782380/view/670629296167978253 Types: Issue Tracking
      Reference typeadded
      —
      VulDB: https://vuldb.com/cve/CVE-2026-116099 Types: Third Party Advisory, VDB Entry
      Reference typeadded
      —
      VulDB: https://vuldb.com/submit/1001276 Types: Third Party Advisory, VDB Entry
      Reference typeadded
      —
      VulDB: https://vuldb.com/vuln/426167 Types: Third Party Advisory, VDB Entry
      Reference typeadded
      —
      VulDB: https://vuldb.com/vuln/426167/cti Types: Third Party Advisory, VDB Entry

      Source identifier: nvd@nist.gov

    3. Record modifiedCISA ADP

      CISA assessment (SSVC): exploitation: proof of concept, automatable: yes

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      SSVC assessmentadded
      —
      {"id":"CVE-2026-116099","role":"CISA Coordinator","options":[{"exploitation":"poc"},{"automatable":"yes"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-10-26T16:08:28.144079Z"}

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    4. ReceivedVulDB

      CVSS V4.0: AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

      CVSS V3.1: AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

      CVSS V2: (AV:N/AC:L/Au:N/C:P/I:P/A:P)

      Weakness type: CWE-119, CWE-787

      Description added or changed

      Show 15 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Descriptionadded
      —
      A flaw has been found in Fusion Creators Studio SCP Containment Breach Multiplayer up to 1.295. This issue affects the function BlitzBanks of the component Skynet++ Virtual Machine. Executing a manipulation can lead to out-of-bounds write. The attack can be executed remotely. The exploit has been published and may be used. Upgrading to version 1.3R is capable of addressing this issue. It is recommended to upgrade the affected component.
      CVSSadded
      —
      AV:N/AC:L/AT:N/PR:N/UI:P/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:X/V:X/RE:X/U:X
      CVSSadded
      —
      AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
      CVSSadded
      —
      (AV:N/AC:L/Au:N/C:P/I:P/A:P)
      Weakness type (CWE)added
      —
      CWE-119
      Weakness type (CWE)added
      —
      CWE-787
      Affected versions (publisher)added
      —
      New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/116xxx/CVE-2026-116099.json">CVE-2026-116099</a>
      Referenceadded
      —
      https://drbloop.dev/blog/one-click-remote-code-execution-in-scp-containment-breach-mutiplayer
      Referenceadded
      —
      https://github.com/drbloop2000/SCP-CBM-RCE/tree/main
      Referenceadded
      —
      https://steamdb.info/patchnotes/25701366/
      Referenceadded
      —
      https://store.steampowered.com/news/app/1782380/view/670629296167978253
      Referenceadded
      —
      https://vuldb.com/cve/CVE-2026-116099
      Referenceadded
      —
      https://vuldb.com/submit/1001276
      Referenceadded
      —
      https://vuldb.com/vuln/426167
      Referenceadded
      —
      https://vuldb.com/vuln/426167/cti

      Source identifier: cna@vuldb.com

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