CVE-2008-5769: Multiple cross-site scripting (XSS) vulnerabilities in Kerio MailServer before 6.6.2 allow remote attackers to

Q: How do I fix CVE-2008-5769?

kerio mailserver: upgrade to newer than 6.6.1. Exact commands for each OS are on this page.

Q: Is CVE-2008-5769 being exploited?

CVE-2008-5769 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-2008-5769 affect?

CVE-2008-5769 affects kerio mailserver. Severity is medium (CVSS 4.3). Multiple cross-site scripting (XSS) vulnerabilities in Kerio MailServer before 6.6.2 allow remote attackers to inject arbitrary web script or HTML via the (1) folder parameter to mailCompose.php or the (2) daytime parameter to calendarEdit.

Q: How urgent is CVE-2008-5769?

Priority 32/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2008-5769 is a medium-severity flaw (CVSS 4.3) affecting kerio mailserver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple cross-site scripting (XSS) vulnerabilities in Kerio MailServer before 6.6.2 allow remote attackers to inject arbitrary web script or HTML via the (1) folder parameter to mailCompose.php or the (2) daytime parameter to calendarEdit.php. NOTE: some of these details are obtained from third party information.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-79
Published	2008-12-30
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: kerio

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

Am I affected?

Timeline

2008-12-30 20:30 UTCPublished CVE record published
2026-06-16 23:00 UTCUpdated Record last modified

kerio kerio mailserver UPGRADE

Affected: <= 6.6.1 · 5.0 · 5.1 · 5.1.1 · 5.6.3 · 5.6.4 · 5.6.5 · 5.7.0

Fixed in: newer than 6.6.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy kerio-mailserver || rpm -q kerio-mailserver || kerio-mailserver --version

2. UPGRADE to newer than 6.6.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade kerio-mailserver

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kerio-mailserver

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-2008-5769?

kerio mailserver: upgrade to newer than 6.6.1. Exact commands for each OS are on this page.

Is CVE-2008-5769 being exploited?

CVE-2008-5769 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-2008-5769 affect?

CVE-2008-5769 affects kerio mailserver. Severity is medium (CVSS 4.3). Multiple cross-site scripting (XSS) vulnerabilities in Kerio MailServer before 6.6.2 allow remote attackers to inject arbitrary web script or HTML via the (1) folder parameter to mailCompose.php or the (2) daytime parameter to calendarEdit.

How urgent is CVE-2008-5769?

Priority 32/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

Related CVEs

CVE-2011-1506 MEDIUM 6.8 DOWNGRADE DOWNGRADE The STARTTLS implementation in Kerio Connect 7.1.4 build 2985 and MailServer 6.x does not properly restrict I/
CVE-2009-2636 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in the Integration page in the WebMail component in Kerio MailServer
CVE-2008-5760 MEDIUM 4.3 UPGRADE Cross-site scripting (XSS) vulnerability in error413.php in Kerio MailServer before 6.6.2 allows remote attack
CVE-2008-0860 HIGH 10.0 MITIGATE UPGRADE Unspecified vulnerability in the AVG plugin in Kerio MailServer before 6.5.0 has unspecified impact via unknow
CVE-2008-0859 MEDIUM 5.0 DOWNGRADE Unspecified vulnerability in Kerio MailServer before 6.5.0 allows remote attackers to cause a denial of servic

References

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