CVE-2026-21331: Adobe Connect versions 2025.3, 12.10 and earlier are affected by a reflected Cross-Site Scripting (XSS) vulner

Q: How do I fix CVE-2026-21331?

connect: upgrade to 12.11; connect desktop application: upgrade to newer than 2025.3; connect desktop application: upgrade to 2025.9.15. Exact commands for each OS are on this page.

Q: Is CVE-2026-21331 being exploited?

CVE-2026-21331 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-21331 affect?

CVE-2026-21331 affects connect, connect desktop application, connect desktop application. Severity is medium (CVSS 6.1). Adobe Connect versions 2025.3, 12.10 and earlier are affected by a reflected Cross-Site Scripting (XSS) vulnerability. If an attacker is able to convince a victim to visit a URL referencing a vulnerable page, malicious JavaScript content ma

Q: How urgent is CVE-2026-21331?

Priority 26/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADEUPGRADEUPGRADE

CVE-2026-21331 is a medium-severity flaw (CVSS 6.1) affecting connect, 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 2025.3, 12.10 and earlier are affected by a reflected Cross-Site Scripting (XSS) vulnerability. If an attacker is able to convince a victim to visit a URL referencing a vulnerable page, malicious JavaScript content may be executed within the context of the victim's browser. Scope is changed.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-04-14
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

2026-04-14 18:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

adobe connect UPGRADE

Affected: < 12.11

Fixed in: 12.11

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 12.11 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade connect

Note

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

adobe connect desktop application UPGRADE

Affected: <= 2025.3

Fixed in: newer than 2025.3

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 2025.3 (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 UPGRADE

Affected: < 2025.9.15

Fixed in: 2025.9.15

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 2025.9.15 (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.

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-2026-21331?

connect: upgrade to 12.11; connect desktop application: upgrade to newer than 2025.3; connect desktop application: upgrade to 2025.9.15. Exact commands for each OS are on this page.

Is CVE-2026-21331 being exploited?

CVE-2026-21331 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-2026-21331 affect?

CVE-2026-21331 affects connect, connect desktop application, connect desktop application. Severity is medium (CVSS 6.1). Adobe Connect versions 2025.3, 12.10 and earlier are affected by a reflected Cross-Site Scripting (XSS) vulnerability. If an attacker is able to convince a victim to visit a URL referencing a vulnerable page, malicious JavaScript content ma

How urgent is CVE-2026-21331?

Priority 26/100. No elevated risk signals yet.

Related CVEs

CVE-2026-27246 CRITICAL 9.3 UPGRADE UPGRADE Adobe Connect versions 2025.3, 12.10 and earlier are affected by a DOM-based Cross-Site Scripting (XSS) vulner
CVE-2026-27303 CRITICAL 9.6 UPGRADE UPGRADE Adobe Connect versions 2025.3, 12.10 and earlier are affected by a Deserialization of Untrusted Data vulnerabi
CVE-2026-27243 CRITICAL 9.3 UPGRADE UPGRADE Adobe Connect versions 2025.3, 12.10 and earlier are affected by a reflected Cross-Site Scripting (XSS) vulner
CVE-2026-27245 CRITICAL 9.3 UPGRADE UPGRADE Adobe Connect versions 2025.3, 12.10 and earlier are affected by a reflected Cross-Site Scripting (XSS) vulner
CVE-2026-9208 HIGH 8.8 UPGRADE Tanium addressed an unauthorized code execution vulnerability in Connect.

References

← Back to latest CVEs