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CVE-2026-104890

HIGH 7.2

Published 2026-10-05 · Last modified 2026-10-07

Kunstmaan CMS is an open source content management system based on the Symfony framework. Prior to 7.3.2, src/Kunstmaan/MediaBundle/Helper/File/FileHandler.php performs the blacklisted_extensions check case-sensitively in FileHandler::getFilePath and lowercases the stored extension afterward. An authenticated backend user with media access can upload a mixed-case executable extension such as PHP that bypasses the check and is stored in the web-accessible media directory with an executable lowercase extension. The default blacklist also omits several server-executable extension types, allowing the same code-execution impact where the web server executes uploaded files. This issue is fixed in version 7.3.2.

ELEVATED IMPACT

Severe if exploited (CVSS 7.2), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.4%chance of exploitation in 30 days · 36th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

7.2CVSS 3.1 · HIGH

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ⚠Privileges: Requires an admin / high-privilege account
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Kunstmaan

Products Kunstmaanbundlescms Bundles Cms Media Bundle

Weakness (CWE)

  • CWE-434: : Unrestricted Upload of File with Dangerous Type

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

References and research data (JSON)

Packages and version ranges

Each advisory describes its own package and affected ranges. A boundary applies to that range; it is not a universal upgrade recommendation.

  • kunstmaan/media-bundle Packagist

    pkg:composer/kunstmaan/media-bundle

    ECOSYSTEM range
    • All earlier versions (introduced 0)
    • Fixed boundary (excluded): 7.3.2
    215 explicitly listed affected versions

    3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.2.0, 3.2.1, 3.2.1.1, 3.2.2, 3.2.3, 3.2.4, 3.2.4.1, 3.2.5, 3.2.6, 3.3.0, 3.3.1, 3.3.2, 3.3.3, 3.3.4, 3.4.0, 3.4.1, 3.4.2, 3.5.0, 3.5.1, 3.5.2, 3.6.0, 3.6.1, 3.6.2, 3.6.3, 4.0.0, 4.0.0-RC1, 4.0.1, 4.0.2, 4.0.3, 4.1.0, 4.1.1, 4.1.2, 4.1.3, 4.1.4, 4.2.0, 4.2.1, 4.2.2, 4.2.3, 5.0.0, 5.0.0-RC1, 5.0.0-RC2, 5.0.1, 5.0.10, 5.0.11, 5.0.12, 5.0.13, 5.0.14, 5.0.2, 5.0.3, 5.0.4, 5.0.5, 5.0.6, 5.0.7, 5.0.9, 5.1.0, 5.1.1, 5.1.2, 5.10.0, 5.10.1, 5.10.2, 5.10.3, 5.10.4, 5.10.5, 5.10.6, 5.10.7, 5.2.0, 5.2.1, 5.2.2, 5.2.3, 5.2.4, 5.2.5, 5.3.0, 5.3.1, 5.3.10, 5.3.11, 5.3.12, 5.3.13, 5.3.14, 5.3.2, 5.3.3, 5.3.4, 5.3.5, 5.3.7, 5.3.8, 5.3.9, 5.4.0, 5.4.1, 5.4.2, 5.4.3, 5.4.4, 5.4.5, 5.4.6, 5.4.7, 5.5.0, 5.5.1, 5.5.2, 5.5.3, 5.5.4, 5.5.5, 5.5.6, 5.6.0, 5.6.1, 5.6.2, 5.6.3, 5.6.4, 5.6.5, 5.6.6, 5.7.0, 5.7.1, 5.7.2, 5.7.3, 5.8.0, 5.8.1, 5.9.0, 5.9.1, 5.9.2, 5.9.3, 6.0.0, 6.0.1, 6.0.2, 6.0.3, 6.0.4, 6.0.5, 6.0.6, 6.1.0, 6.1.1, 6.1.2, 6.1.3, 6.1.4, 6.1.5, 6.1.6, 6.1.7, 6.1.8, 6.1.9, 6.2.0, 6.2.1, 6.2.2, 6.2.3, 6.2.4, 6.2.5, 6.3.0, 6.3.1, 6.4.0, 6.4.0-alpha1, 6.4.0-alpha2, 6.4.1, 6.4.2, 6.4.3, 6.4.4, 7.0.0, 7.0.0-alpha1, 7.0.1, 7.0.2, 7.0.3, 7.0.4, 7.0.5, 7.1.0, 7.1.0-alpha1, 7.1.0-alpha2, 7.1.1, 7.1.2, 7.1.3, 7.1.4, 7.2.0, 7.2.1, 7.3.0, 7.3.1, v1.3, v1.3.1, v1.3.2, v1.3.3, v2.1, v2.1.1, v2.1.2, v2.1.3, v2.2, v2.2.1, v2.2.10, v2.2.2, v2.2.3, v2.2.8, v2.2.9, v2.3, v2.3.1, v2.3.10, v2.3.11, v2.3.12, v2.3.13, v2.3.14, v2.3.15, v2.3.16, v2.3.17, v2.3.18, v2.3.19, v2.3.2, v2.3.20, v2.3.21, v2.3.22, v2.3.23, v2.3.3, v2.3.4, v2.3.5, v2.3.6, v2.3.7, v2.3.8, v2.3.9

    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-p279-5wcv-45vq/GHSA-p279-5wcv-45vq.json"
  }
}
    GitHub Advisory Database · GHSA-p279-5wcv-45vq · Updated 2026-10-07T18:15:11.799807414Z
  • kunstmaan/bundles-cms Packagist

    pkg:composer/kunstmaan/bundles-cms

    ECOSYSTEM range
    • All earlier versions (introduced 0)
    • Fixed boundary (excluded): 7.3.2
    178 explicitly listed affected versions

    3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.2.0, 3.2.1, 3.2.1.1, 3.2.2, 3.2.3, 3.2.4, 3.2.4.1, 3.2.5, 3.2.6, 3.3.0, 3.3.1, 3.3.2, 3.3.3, 3.3.4, 3.4.0, 3.4.1, 3.4.2, 3.5.0, 3.5.1, 3.5.2, 3.6.0, 3.6.1, 3.6.2, 3.6.3, 4.0.0, 4.0.0-RC1, 4.0.1, 4.0.2, 4.0.3, 4.1.0, 4.1.1, 4.1.2, 4.1.3, 4.1.4, 4.2.0, 4.2.1, 4.2.2, 4.2.3, 5.0.0, 5.0.0-RC1, 5.0.0-RC2, 5.0.1, 5.0.10, 5.0.11, 5.0.12, 5.0.13, 5.0.14, 5.0.2, 5.0.3, 5.0.4, 5.0.5, 5.0.6, 5.0.7, 5.0.8, 5.0.9, 5.1.0, 5.1.1, 5.1.2, 5.10.0, 5.10.1, 5.10.2, 5.10.3, 5.10.4, 5.10.5, 5.10.6, 5.10.7, 5.2.0, 5.2.1, 5.2.2, 5.2.3, 5.2.4, 5.2.5, 5.3.0, 5.3.1, 5.3.10, 5.3.11, 5.3.12, 5.3.13, 5.3.14, 5.3.2, 5.3.3, 5.3.4, 5.3.5, 5.3.6, 5.3.7, 5.3.8, 5.3.9, 5.4.0, 5.4.1, 5.4.2, 5.4.3, 5.4.4, 5.4.5, 5.4.6, 5.4.7, 5.5.0, 5.5.1, 5.5.2, 5.5.3, 5.5.4, 5.5.5, 5.5.6, 5.6.0, 5.6.1, 5.6.2, 5.6.3, 5.6.4, 5.6.5, 5.6.6, 5.7.0, 5.7.1, 5.7.2, 5.7.3, 5.8.0, 5.8.1, 5.9.0, 5.9.1, 5.9.2, 5.9.3, 6.0.0, 6.0.1, 6.0.2, 6.0.3, 6.0.4, 6.0.5, 6.0.6, 6.1.0, 6.1.1, 6.1.2, 6.1.3, 6.1.4, 6.1.5, 6.1.6, 6.1.7, 6.1.8, 6.1.9, 6.2.0, 6.2.1, 6.2.2, 6.2.3, 6.2.4, 6.2.5, 6.3.0, 6.3.1, 6.4.0, 6.4.0-alpha1, 6.4.0-alpha2, 6.4.1, 6.4.2, 6.4.3, 6.4.4, 7.0.0, 7.0.0-alpha1, 7.0.1, 7.0.2, 7.0.3, 7.0.4, 7.0.5, 7.1.0, 7.1.0-alpha1, 7.1.0-alpha2, 7.1.1, 7.1.2, 7.1.3, 7.1.4, 7.2.0, 7.2.1, 7.3.0, 7.3.1

    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-p279-5wcv-45vq/GHSA-p279-5wcv-45vq.json"
  }
}
    GitHub Advisory Database · GHSA-p279-5wcv-45vq · Updated 2026-10-07T18:15:11.799807414Z

All CVSS metrics

  • HIGH 7.2 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
  • HIGH 7.2 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS