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ConnectApplication · Adobe

CVE-2026-27303

CRITICAL · 9.6 CVSS v3.1 Published 2026-04-14
Fix available
A fix is available. Upgrade to 12.11 / 2025.9.15 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Adobe Connect versions 2025.3, 12.10 and earlier are affected by a Deserialization of Untrusted Data vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must visit a maliciously crafted URL or interact with a compromised web page. Scope is changed.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Adobe Connect versions 2025.3, 12.10 and earlier contain a Deserialization of Untrusted Data vulnerability that allows arbitrary code execution in the context of the current user. Exploitation requires user interaction such as visiting a malicious URL or compromised webpage. The changed scope means the vulnerability can impact components beyond the vulnerable component itself.

MitigationUpdate Adobe Connect to the latest patched version once released by Adobe. As a temporary defense-in-depth measure, implement network segmentation and restrict user access to untrusted URLs.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
ConnectApplication
Affected:< 12.11
Connect Desktop ApplicationApplication
Affected:<= 2025.3< 2025.9.15

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Check Adobe Connect server version
    Access Adobe Connect Central web interface and navigate to the About section, or check the installation directory for version.xml or version.ini files, or query the Windows registry under HKLM\SOFTWARE\Adobe\Connect
    Affected if Installed version is 12.10 or earlier (version number less than 12.11)
  2. Check Adobe Connect Desktop Application version
    Open Windows Control Panel > Programs and Features and locate Adobe Connect Desktop Application, or check the Windows registry under HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall for the application entry, or right-click the ConnectDesktopApp.exe file and view Properties > Details for the File Version
    Affected if Installed version is 2025.3 or earlier, or any version below 2025.9.15

User is affected if either Adobe Connect server version is below 12.11 or Adobe Connect Desktop Application version is 2025.3 or earlier (or below 2025.9.15)

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 12.11 / 2025.9.15 or later
Fixed in 12.112025.9.15
Interim mitigation

Update Adobe Connect to the latest patched version once released by Adobe. As a temporary defense-in-depth measure, implement network segmentation and restrict user access to untrusted URLs.

Recommended fix High confidence

Adobe Connect version 12.11 or later; Adobe Connect Desktop Application version 2025.9.15 or later

  1. 1. Identify the Adobe Connect deployment type (server-based Connect or Connect Desktop Application)
  2. 2. For Adobe Connect server: Check current version by accessing the Admin dashboard or checking the installation
  3. 3. For Adobe Connect Desktop Application: Open the application, go to Help > About to check the current version
  4. 4. For Adobe Connect server: Backup the current installation and database before upgrading
  5. 5. Download the latest Adobe Connect version 12.11 or later from the Adobe website or your licensed download portal
  6. 6. For server upgrade: Follow Adobe's standard upgrade procedure - stop services, run the installer, and verify configuration
  7. 7. For Desktop Application: Uninstall the current version or use the auto-update feature to install version 2025.9.15 or later
  8. 8. After upgrade, verify the new version number matches the fixed release
Caveat Review Adobe's migration documentation for version 12.x upgrades as configuration changes may be required; test thoroughly in non-production environment first

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Connect Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing8.0 h
  • Review / QA2.0 h
22.0 hours of engineering $3,800
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,080.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-27303 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data