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CVE-2026-69091 – Authentication Bypass – Admidio before 5.0.11

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Summary

CVE-2026-69091 is an authentication bypass vulnerability in Admidio, the open-source membership and organization management application. The flaw resides in the forum module when the site is configured in login-only mode, allowing unauthenticated attackers to read forum topics and posts. It affects all versions before 5.0.11 and is rated HIGH severity.

Technical details

  • Root cause: The access control logic in modules/forum.php fails to validate the login-only configuration state (CWE-306, Missing Authentication for Critical Function).
  • Trigger conditions: The Admidio instance is configured in login-only mode; an attacker directly accesses the forum module with read-only parameters.
  • Attack vector: Network — remotely exploitable by an unauthenticated attacker with no user interaction.
  • Impact: Unauthorized disclosure of forum topics and posts (confidentiality only; no integrity or availability impact).

Affected software

  • Admidio: all versions before 5.0.11

Severity

  • CVSS v3.1 base score: 7.5 (HIGH) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  • CVSS v4.0 base score: 8.7 (HIGH) — 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 to Admidio 5.0.11 or later, which fixes the access control validation in the forum module.
  • If no patch: Restrict network access to the forum module and the Admidio instance until the upgrade can be applied.

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: /adm_program/, /adm_my_files/
  • Page title: Admidio
  • set-cookie response header: admidio

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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