CVE-2026-34659: Adobe Connect versions 2025.9.15, 2025.8.157 and earlier are affected by a Deserialization of Untrusted Data v

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CRITICAL 9.6UPGRADEDOWNGRADE

CVE-2026-34659 is a critical-severity flaw (CVSS 9.6) affecting connect desktop application, connect desktop application. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Adobe 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.

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-502
Published	2026-05-12
Last modified	2026-10-26

Publisher (CNA): Adobe Systems Incorporated · Vendor: adobe

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-12 19:16 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

adobe connect desktop application UPGRADE

Affected: <= 2025.8.157

Fixed in: newer than 2025.8.157

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy connect-desktop-application || rpm -q connect-desktop-application || connect-desktop-application --version

2. UPGRADE to newer than 2025.8.157 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade connect-desktop-application

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade connect-desktop-application

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

adobe connect desktop application DOWNGRADE

Affected: 2025.9.15

Fixed in: no fixed release known

Safe to downgrade to: a release before 2025.9.15

1. Check installed version

apt-cache policy connect-desktop-application || rpm -q connect-desktop-application || connect-desktop-application --version

2. No fixed release: DOWNGRADE to a release before 2025.9.15 (Debian / Ubuntu)

apt-cache madison connect-desktop-application sudo apt install connect-desktop-application=<VERSION_BEFORE_2025.9.15> sudo apt-mark hold connect-desktop-application

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list connect-desktop-application sudo dnf downgrade connect-desktop-application-<VERSION_BEFORE_2025.9.15> sudo dnf versionlock add connect-desktop-application

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34659?

connect desktop application: upgrade to newer than 2025.8.157; connect desktop application: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-34659 being exploited?

CVE-2026-34659 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34659 affect?

CVE-2026-34659 affects connect desktop application, connect desktop application. Severity is critical (CVSS 9.6). Adobe 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 vuln

How urgent is CVE-2026-34659?

Priority 46/100. Critical severity

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References

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