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CVE-2026-34741 – Authentication Bypass Leading to PHP File Execution – Combodo iTop < 3.2.3

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Summary

CVE-2026-34741 is an authentication bypass vulnerability (CWE-306: Missing Authentication for Critical Function) in Combodo iTop, an open-source IT service management platform. It allows unauthenticated remote attackers to execute arbitrary PHP files from the env-production directory on fresh iTop production instances via the exec.php endpoint. The flaw carries a CVSS v3.1 base score of 8.6 (High).

Technical details

  • Root cause: pages/exec.php did not enforce authentication or restrict which module pages could be invoked, allowing any PHP page located under the env-production directory to be executed without a valid session.
  • Trigger conditions: Exploitation applies to "fresh" (newly installed) iTop instances running in the production environment where no additional access controls have been layered on top of the default configuration.
  • Attack vector: Network — an unauthenticated attacker sends a crafted request to exec.php specifying a target module/page to execute; no privileges or user interaction are required.
  • Impact: Execution of arbitrary PHP files reachable through the exec mechanism, resulting in low confidentiality impact, high integrity impact, and low availability impact, per the CVSS vector.

Affected software

  • Combodo iTop versions prior to 3.2.3 (includes all 3.2.x releases before 3.2.3 and all 3.1.x and earlier versions)

Severity

  • CVSS v3.1 Base Score: 8.6 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

Mitigation and recommended actions

  • Immediate: Upgrade to Combodo iTop 3.2.3 or 3.3.0, both of which contain the fix.
  • Fix mechanism: The patched versions introduce a delegated authentication endpoints whitelist for exec.php. Pages belonging to the core and dictionaries modules are blocked outright, and modules must explicitly declare which endpoints may be reached without authentication.
  • If immediate patching is not possible: Review the new security.force_login_when_no_delegated_authentication_endpoints_list configuration parameter and consult Combodo’s security documentation to enforce login requirements for exec.php-driven pages; restrict network exposure of the iTop instance until patched.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Raw response body: type="application/opensearchdescription+xml" title="iTop"

References

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How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
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