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ConnectApplication · Adobe

CVE-2026-27243

CRITICAL · 9.3 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 reflected Cross-Site Scripting (XSS) vulnerability. An attacker could exploit this vulnerability to inject malicious scripts into a web page, potentially gaining elevated access or control over the victim's account or session. 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 · moderate confidence

A reflected Cross-Site Scripting (XSS) vulnerability exists in Adobe Connect versions 2025.3, 12.10 and earlier. The vulnerability allows attackers to inject malicious JavaScript scripts through crafted URLs that are reflected back to the user without proper sanitization, potentially enabling session hijacking or credential theft.

MitigationApply the vendor patch when available. In the interim, implement input validation and output encoding on all user-supplied parameters, and deploy Content Security Policy (CSP) headers to mitigate script injection risks.

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
None

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

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
    Log into the Adobe Connect Central Administration console. The version is typically displayed on the login page footer or in the System Information section under the Admin menu. Alternatively, check the installation directory for a version file, or run 'msiexec /x' on the Windows installer to view product details.
    Affected if The installed version is 12.10 or earlier, or any version below 12.11
  2. Check Adobe Connect Desktop Application version
    Open the Adobe Connect Desktop Application. Go to Help > About Adobe Connect Desktop. The version number is displayed in the dialog. On Windows, you can also view it in Programs and Features. On macOS, check the application in the Applications folder using Get Info.
    Affected if The desktop application version is 2025.3 or earlier, or below 2025.9.15
  3. Determine if the web interface is exposed
    Identify whether the Adobe Connect server web interface is accessible externally or on internal networks. Check your network firewall rules, reverse proxy configuration, or load balancer settings to determine the exposure scope of the /connect/ endpoint.
    Affected if The Adobe Connect web interface is accessible to untrusted users or network segments who could submit crafted URLs
  4. Review URL parameters in use
    Document which query parameters the Adobe Connect server accepts. Common parameters include meeting IDs, user IDs, and action parameters. Identify any endpoints that echo back user-supplied values in responses without apparent sanitization.
    Affected if The server reflects URL parameter values directly in HTML responses without encoding

A defender is affected if Adobe Connect server is version 12.10 or earlier, or Adobe Connect Desktop Application is 2025.3 or earlier, and the web interface accepts URL parameters that could reflect user input.

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

Apply the vendor patch when available. In the interim, implement input validation and output encoding on all user-supplied parameters, and deploy Content Security Policy (CSP) headers to mitigate script injection risks.

Recommended fix High confidence

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

  1. 1. Identify the Adobe Connect deployment type: Check if using Connect server/portal or Connect Desktop Application
  2. 2. For Adobe Connect (server/portal): Navigate to the admin dashboard and check the current version under System Administration > System Info
  3. 3. For Adobe Connect Desktop Application: Open the application and go to Help > About to view the version number
  4. 4. If running Adobe Connect (server/portal) version < 12.11: Upgrade to version 12.11 or later by downloading from the Adobe Connect downloads page
  5. 5. If running Adobe Connect Desktop Application version <= 2025.3 or < 2025.9.15: Upgrade to version 2025.9.15 or later from the Adobe website or within the application
  6. 6. After upgrading, clear browser cache and cookies to remove any cached malicious content
  7. 7. Verify the upgrade was successful by confirming the new version numbers in the respective admin or about sections

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

Fix this in Connect Scoped from the published advisory
  • Consultation3.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
17.0 hours of engineering $3,000
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,800.

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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-2026-27243 in production — separate from our analysis above.

No notes yet

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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