MediumCVE-2026-112956

    ApostropheCMS: Archive duplicate continuation lets contributors overwrite published content (CVE-2026-112956)

    Published Last modified Sources: Hersteller, CVE.org

    What is affected, what to do

    Update Apostrophe to version 4.34.0, @apostrophecms Mport-export to version 3.7.1.

    Affected
    • Apostrophe lt *..4.34.0
    • @apostrophecms Mport-export lt *..3.7.1
    Fixed in
    • Apostrophe 4.34.0
    • @apostrophecms Mport-export 3.7.1

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

    Metrics

    6.5

    Priority

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

    Source: Vendor (CNA), CVSS v3

    6.5

    CVSS v3

    Severity Medium on the scale from 0 to 10.

    Source: Hersteller, CVE.org

    —

    EPSS score

    No value is available for this vulnerability.

    Show all metrics
    Severity
    Medium
    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
    62.50 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.

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    no public PoC known
    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.

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    6.5 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
    6.5
    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
    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.

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    CWE-863

    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.

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    Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
    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.

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    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

    Review scope and evidence limits

    Package: @apostrophecms/import-export, version 3.7.0.

    Release tag reviewed: @apostrophecms/import-export@3.7.0, commit 9500b8b0e1d630d5e07fbb5fd2c25ed0943845ce (September 30, 2026).

    Current main reviewed: 5ce3732be0ebdebb4db0f8ef160c81e8671157e6.

    The importer, gzip extractor, import permission gate, and core permission implementation have no differences between that release tag and the reviewed main. This follow-up is a static remediation review. We have not repeated the original end-to-end reproductions against the latest release or tested a deployed site. Current exploitability and impact therefore still require maintainer validation; the observations below establish that the reported security checks remain absent in public source. The original emailed PDF contains the original reproduction material. Please refer to that existing private attachment.

    Archive duplicate continuation permits unauthorized published-content replacement

    The overrideDuplicates() continuation still accepts client-supplied replacement choices, rather than binding them to a server-maintained, user-owned duplicate analysis. The replacement and write helpers do not establish a single canonical resource identity and authorization context before the update. This leaves the reported gap between draft editing authority and the published target selected for replacement unresolved at source level.

    The original report describes a contributor crossing the publication boundary through duplicate replacement on an import-enabled localized type. We have not repeated that end-to-end sequence on 3.7.0.

    Suggested remediation: bind continuation state to the initiating user, archive, job, permitted source/target mapping, locale and mode; reject inconsistent identity metadata; derive permissions from the actual loaded target and require publication authority for published targets.

    Source: overrideDuplicates(), replaceDocId(), and insertOrUpdateDoc() in the importer.

    Coordination

    Vivek R / Winfunc Original reporting team: Mufeed VH / Winfunc

    Source: GitHub Security Advisories, 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
    VendorProductAffected versionsFixed in
    @apostrophecmsmport-export
    • < 3.7.1
    • 3.7.1
    apostrophecmsapostrophe
    • < 4.34.0
    • 4.34.0
    npm@apostrophecms/import-export
    • < 3.7.1
    • 3.7.1

    Weakness classes (CWE)

    • CWE-863Incorrect Authorization

      Class

      The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

      Entry at MITRE CWE-863

    References & sources

    • github.comapostrophecms/apostrophe/commit/06e4b377f3c360f9e89c32dccd7e505…x_refsource_MISC
    • github.comapostrophecms/apostrophe/commit/40b989b1a9dd23d30029b8ce7668634…x_refsource_MISC
    • github.comapostrophecms/apostrophe/releases/tag/@apostrophecms/import-exp…x_refsource_MISC
    • github.comapostrophecms/apostrophe/security/advisories/GHSA-jf5h-36mg-rp6xx_refsource_CONFIRM

    Reanalysis & status changes

    Chronological NVD audit events for this CVE — reanalyses, CVSS updates, CPE diffs.

    1. CVE Modified134c704f-9b21-4f2e-91b3-4a467353bcc0

      • SSVC: after {"id":"CVE-2026-112956","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technical…

    2. New CVE Receivedsecurity-advisories@github.com

      • Description: after ApostropheCMS is an open-source Node.js content management system. Prior to 3.7.1 of the import-export module, duplicate-import continuation accepts client-controlled replacement choices without binding them to a user-owned server-side analysis or authorizing the canonical target. On an import-enabled localized type, a contributor with draft editing authority can cross the publication boundary by selecting a published document for replacement, although the current assessment is based on remediation review rather than a repeated end-to-end reproduction. This issue is fixed in version 3.7.1.
      • CVSS V3.1: after AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
      • CWE: after CWE-863
      • Affected: after New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/112xxx/CVE-2026-112956.json">CVE-2026-112956</a>
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