CVE-2006-2303: Cross-Application Scripting (XAS) vulnerability in ICQ Client 5.04 build 2321 and earlier allows remote attack

This month

MEDIUM 6.4DOWNGRADE

CVE-2006-2303 is a medium-severity flaw (CVSS 6.4) affecting icq. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-Application Scripting (XAS) vulnerability in ICQ Client 5.04 build 2321 and earlier allows remote attackers to inject arbitrary web script from one application into another via a banner, which is processed in the My Computer zone using the Internet Explorer COM object.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.4 (Medium)
EPSS exploit chance	1.6% (top 25%)
CISA exploited list	No
Published	2006-05-11
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: mirabilis

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2006-05-11 10:02 UTCPublished CVE record published
2026-06-16 22:24 UTCUpdated Record last modified

mirabilis icq DOWNGRADE

Affected: 5.04_build2321

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.04_build2321

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.04_build2321 (Debian / Ubuntu)

apt-cache madison icq sudo apt install icq=<VERSION_BEFORE_5.04_build2321> sudo apt-mark hold icq

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

dnf --showduplicates list icq sudo dnf downgrade icq-<VERSION_BEFORE_5.04_build2321> sudo dnf versionlock add icq

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-2006-2303?

icq: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2006-2303 being exploited?

CVE-2006-2303 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-2006-2303 affect?

CVE-2006-2303 affects icq. Severity is medium (CVSS 6.4). Cross-Application Scripting (XAS) vulnerability in ICQ Client 5.04 build 2321 and earlier allows remote attackers to inject arbitrary web script from one application into another via a banner, which is processed in the My Computer zone usin

How urgent is CVE-2006-2303?

Priority 41/100. No elevated risk signals yet.

Software pages

Internet Explorer vulnerabilities

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References

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