SB2026041705 - Multiple vulnerabilities in Adobe Connect

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Main Vulnerability Database SB2026041705

SB2026041705 - Multiple vulnerabilities in Adobe Connect

Published: April 17, 2026

Security Bulletin ID SB2026041705
CSH Severity
High
Patch available
YES
Number of vulnerabilities 9
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 33% Medium 56% Low 11%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 9 vulnerabilities.


1) Deserialization of Untrusted Data (CVE-ID: CVE-2026-27302)

CWE-ID: CWE-502 - Deserialization of Untrusted Data

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to deserialization of untrusted data in Adobe Connect when processing untrusted serialized data. A remote attacker can deliver specially crafted data to execute arbitrary code.

User interaction is required.


2) Deserialization of Untrusted Data (CVE-ID: CVE-2026-27303)

CWE-ID: CWE-502 - Deserialization of Untrusted Data

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to deserialization of untrusted data in Adobe Connect when processing untrusted serialized data. A remote attacker can deliver specially crafted data to execute arbitrary code.

User interaction is required.


3) Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (CVE-ID: CVE-2026-27243)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to reflected cross-site scripting in Adobe Connect when handling crafted web input. A remote attacker can send a specially crafted request to execute arbitrary code.

User interaction is required.


4) Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (CVE-ID: CVE-2026-27245)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to reflected cross-site scripting in Adobe Connect when handling crafted web input. A remote attacker can send a specially crafted request to execute arbitrary code.

User interaction is required.


5) Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (CVE-ID: CVE-2026-27246)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to cross-site scripting in Adobe Connect when processing DOM-based content. A remote attacker can send a specially crafted request to execute arbitrary code.

User interaction is required.


6) Deserialization of Untrusted Data (CVE-ID: CVE-2026-34615)

CWE-ID: CWE-502 - Deserialization of Untrusted Data

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to deserialization of untrusted data in Adobe Connect when processing untrusted serialized data. A remote attacker can deliver specially crafted data to execute arbitrary code.

User interaction is required.


7) Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (CVE-ID: CVE-2026-34617)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear


The vulnerability allows a remote user to escalate privileges.

The vulnerability exists due to cross-site scripting in Adobe Connect when handling crafted web input. A remote user can send a specially crafted request to escalate privileges.


8) Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (CVE-ID: CVE-2026-21331)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to reflected cross-site scripting in Adobe Connect when handling crafted web input. A remote attacker can send a specially crafted request to execute arbitrary code.

User interaction is required.


9) Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (CVE-ID: CVE-2026-34614)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to reflected cross-site scripting in Adobe Connect when handling crafted web input. A remote attacker can send a specially crafted request to execute arbitrary code.

User interaction is required.


Remediation

Install update from vendor's website.

References