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CVE-2026-75105 – Unauthenticated Information Disclosure – phpIPAM before 1.8.2

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Summary

CVE-2026-75105 is an authorization bypass / information disclosure vulnerability in phpIPAM, an open-source IP address management application. Versions prior to 1.8.2 fail to verify that a requested IP address record actually belongs to the subnet for which a temporary share token was issued, allowing an unauthenticated holder of any valid share link to read address data across unrelated subnets. The issue has a CVSS score of 8.7 (High).

Technical details

  • Root cause: app/temp_share/index.php and app/temp_share/address.php use the subnetId request parameter directly as a database key to fetch address records, without confirming the address belongs to the subnet the temporary share was actually scoped to.
  • Trigger conditions: phpIPAM’s "temporary share" feature must be in use with a share type of subnets. An attacker only needs possession of one valid, non-expired temporary share URL.
  • Attack vector: Network-based, no authentication or user interaction required (AV:N/AC:L/PR:N/UI:N). The attacker enumerates the subnetId parameter to pivot from the authorized subnet into arbitrary other subnets.
  • Impact: Disclosure of IP address records across all sections and subnets, including hostnames, DNS names, MAC addresses, owner/contact fields, and free-text notes fields that may contain credentials or configuration details.

Affected software

  • phpIPAM — all versions prior to 1.8.2
  • Fixed in phpIPAM 1.8.2 and later

Severity

  • CVSS v4.0 Base Score: 8.7 (HIGH)
  • Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade phpIPAM to version 1.8.2 or later, which validates that requested addresses belong to the subnet a temporary share was scoped to.
  • If immediate patching is not possible: Disable or restrict use of the temporary subnet share feature, revoke any active temporary share links, and restrict network access to the phpIPAM web interface to trusted networks/VPN until the upgrade can be applied.

References

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