CVE-2026-34659
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 · uneditedAdobe Connect versions 2025.9.15, 2025.8.157 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. An attacker could exploit this vulnerability to execute arbitrary code. 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 confidenceAdobe Connect versions 2025.9.15 and earlier contain a deserialization vulnerability where untrusted data is deserialized without proper validation. This allows an attacker to inject malicious serialized objects that execute arbitrary code in the context of the current user session when the victim visits a crafted URL or interacts with a compromised page.
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<= 2025.8.157= 2025.9.15CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Locate Adobe Connect Desktop Application installationOn Windows, check Registry key HKEY_LOCAL_MACHINE\SOFTWARE\Adobe\Connect or look in Program Files for Adobe Connect folder. On macOS, check /Applications for Adobe Connect.appAffected if Adobe Connect Desktop Application is installed on the system
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Determine installed version numberCheck the application's version property. On Windows, right-click the executable or check Add/Remove Programs. On macOS, right-click Adobe Connect.app and select Get Info to view the versionAffected if The displayed version matches <= 2025.8.157 or equals 2025.9.15 exactly
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Verify exact version against affected rangesCompare your installed version to the affected list: any build number less than or equal to 2025.8.157, or exactly version 2025.9.15, falls within the vulnerable rangeAffected if The installed version number is 2025.9.15 or any version through 2025.8.157 (for example, 2025.8.156, 2025.8.100, 2025.7.200)
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Confirm application is used to process external contentAdobe Connect Desktop Application processes meeting content and URLs shared via the platform. Note if users in your environment open meeting invites or join rooms using this desktop clientAffected if Users employ the desktop client to join Adobe Connect meetings or open meeting-related content from untrusted sources
The user is affected if Adobe Connect Desktop Application version 2025.9.15 or any version through 2025.8.157 is installed and users process meeting content through the client.
Generated from the published advisory. Verify against your own configuration.
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.
From vendor dataApply the vendor patch from Adobe immediately. Until patched, restrict user access to untrusted URLs and educate users about phishing threats. Consider network segmentation to limit exposure.
- Consultation4.0 h
- Implementation6.0 h
- Testing8.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-34659 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-34659 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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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.
- 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