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Critical

Arbitrary Code Execution in Adobe Connect Deserialization

IdentifiersCVE-2026-27303CWE-502· Deserialization of Untrusted Data

CVE-2026-27303 affects Adobe Connect versions 2025.3, 12.10, and earlier. It is a deserialization of untrusted data vulnerability (CWE-502) that can lead to arbitrary code execution in the context of the current user. The provided content identifies the flaw class and affected product versions but does not specify the exact vulnerable component, endpoint, or function within Adobe Connect. The record also indicates a scope change.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can result in arbitrary code execution in the context of the current user. Given the provided CVSS characteristics and Adobe's description, this may allow compromise of confidentiality, integrity, and availability of the affected system or application context. The record indicates changed scope, meaning the impact may extend beyond the initially vulnerable component's security boundary.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, reduce exposure to untrusted content and restrict access paths that could deliver malicious input to Adobe Connect users. Because the provided content contains conflicting statements regarding user interaction, prudent interim mitigation includes preventing users from visiting untrusted or malicious URLs/web pages and limiting network exposure to the application where feasible. Specific vendor-recommended mitigations are not available in the provided content.

Remediation

Patch, then assume compromise.

Upgrade Adobe Connect to a version newer than 2025.3 and 12.10, as those versions and earlier are identified as affected. Apply the vendor-provided security update referenced by Adobe advisory APSB26-37. No more specific remediation details are available in the provided content.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
AdobeConnectapplication
AdobeConnect Desktop Applicationapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

4 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity3

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-27303
NVD
nvd.nist.gov/vuln/detail/CVE-2026-27303
MITRE CWE · CWE-502
Deserialization of Untrusted Data
Vendor Advisory
helpx.adobe.com/security/products/connect/apsb26-37.html