CVE-2026-27303Network attack vector

User-assisted arbitrary code execution

Published Apr 14, 2026 · Updated Apr 14, 2026

Deserialization of untrusted data in Adobe Connect 12.10 and earlier allows remote attackers to execute arbitrary code after user interaction. Adobe has not disclosed the affected component, serialized data format, or deserialization operation that accepts attacker-controlled input. A victim must visit a maliciously crafted URL or interact with a compromised web page, and successful exploitation runs code in the current user’s context.

CVSS severity9.6
Critical
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization of untrusted data in Adobe Connect 12.10 and earlier allows remote attackers to execute arbitrary code after user interaction. Adobe has not disclosed the affected component, serialized data format, or deserialization operation that accepts attacker-controlled input. A victim must visit a maliciously crafted URL or interact with a compromised web page, and successful exploitation runs code in the current user’s context.

The record

CVE
CVE-2026-27303
Published
Apr 14, 2026
Updated
Apr 14, 2026
Vendor
Adobe
Product
Adobe Connect
Classifications
CWE-502, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=12.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Adobe · Adobe Connectversion=0 <=12.10

Published CVSS scores

9.6AdobeCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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