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CVE-2026-59504 – Client-Side Security Enforcement Bypass – Priority ERP Portal Generator (all versio

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Summary

CVE-2026-59504 is a critical vulnerability in the Portal Generator addon for Priority ERP (originally developed by Soft Solutions, now part of Priority Software). The flaw is classified as CWE-602: Client-Side Enforcement of Server-Side Security, meaning security decisions that should be enforced by the backend are instead relied upon at the client, allowing an unauthenticated network attacker to bypass those controls. The issue carries a CVSS v3.1 base score of 9.1 (Critical).

Technical details

  • Root cause: The Portal Generator addon enforces security-relevant checks (CWE-602) on the client side rather than validating them on the server, allowing the client-side logic to be manipulated or bypassed.
  • Trigger conditions: Exploitation requires no authentication and no user interaction — an attacker only needs network access to a Priority ERP instance running the affected Portal Generator addon.
  • Attack vector: Network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: High confidentiality impact and high integrity impact, with no availability impact — consistent with an attacker being able to read and/or modify server-side data or enforced permissions that should have been validated server-side, without being able to disrupt service availability.
  • Scope: Unchanged (S:U) — the impact is confined to the vulnerable component’s security scope.

Affected software

  • Portal Generator addon to Priority ERP (developed by Soft Solutions) — all versions that do not include Priwall v3.

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation and recommended actions

  • Immediate: Upgrade the Portal Generator addon to a version that includes Priwall v3, per the official advisory (ILVN-2026-0270) issued by Israel’s National Cyber Directorate (INCD).
  • Alternative/longer-term: Migrate to Modern Priority Portals offered by Priority Software, which is cited as an alternative mitigation path in the official advisory.
  • If patching/migration cannot be performed immediately: Do not expose Priority ERP Portal Generator infrastructure directly to the internet. Restrict access to trusted internal networks or via a VPN/authenticated gateway until Priwall v3 or Modern Priority Portals is deployed.
  • Security teams should treat internet-facing Priority ERP Portal Generator deployments as high priority for review given the unauthenticated, network-exploitable nature of this vulnerability.

References

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