CVE-2020-8493: A stored XSS vulnerability in Kronos Web Time and Attendance (webTA) affects 3.8.x and later 3.x versions befo

This month

MEDIUM 4.8UPGRADE

CVE-2020-8493 is a medium-severity flaw (CVSS 4.8) affecting web time and attendance. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A stored XSS vulnerability in Kronos Web Time and Attendance (webTA) affects 3.8.x and later 3.x versions before 4.0 via multiple input fields (Login Message, Banner Message, and Password Instructions) of the com.threeis.webta.H261configMenu servlet via an authenticated administrator.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-01-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: kronos

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-01-30 22:15 UTCPublished CVE record published
2026-06-17 03:26 UTCUpdated Record last modified

kronos web time and attendance UPGRADE

Affected: >= 3.8 and < 4.0

Fixed in: 4.0

Safe to downgrade to: a release before 3.8

1. Check installed version

apt-cache policy web-time-and-attendance || rpm -q web-time-and-attendance || web-time-and-attendance --version

2. UPGRADE to 4.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade web-time-and-attendance

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade web-time-and-attendance

Note

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

3. If no update is available yet, DOWNGRADE to a release before 3.8 (Debian / Ubuntu)

apt-cache madison web-time-and-attendance sudo apt install web-time-and-attendance=<VERSION_BEFORE_3.8> sudo apt-mark hold web-time-and-attendance

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list web-time-and-attendance sudo dnf downgrade web-time-and-attendance-<VERSION_BEFORE_3.8> sudo dnf versionlock add web-time-and-attendance

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: Kronos WebTA 4.0 - Authenticated Remote Privilege Escalation

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-2020-8493?

web time and attendance: upgrade to 4.0. Exact commands for each OS are on this page.

Is CVE-2020-8493 being exploited?

CVE-2020-8493 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-2020-8493 affect?

CVE-2020-8493 affects web time and attendance. Severity is medium (CVSS 4.8). A stored XSS vulnerability in Kronos Web Time and Attendance (webTA) affects 3.8.x and later 3.x versions before 4.0 via multiple input fields (Login Message, Banner Message, and Password Instructions) of the com.threeis.webta.H261configMen

How urgent is CVE-2020-8493?

Priority 40/100. Public exploit reference

Related CVEs

CVE-2020-8496 MEDIUM 4.8 UPGRADE In Kronos Web Time and Attendance (webTA) 4.1.x and later 4.x versions before 5.0, there is a Stored XSS vulne
CVE-2020-8495 HIGH 7.5 UPGRADE In Kronos Web Time and Attendance (webTA) 3.8.x and later 3.x versions before 4.0, the com.threeis.webta.H491d
CVE-2020-8494 HIGH 8.8 UPGRADE In Kronos Web Time and Attendance (webTA) 3.8.x and later 3.x versions before 4.0, the com.threeis.webta.H402e
CVE-2020-35604 CRITICAL 9.8 DOWNGRADE An XXE attack can occur in Kronos WebTA 5.0.4 when SAML is used.
CVE-2020-14982 MEDIUM 6.5 UPGRADE A Blind SQL Injection vulnerability in Kronos WebTA 3.8.x and later before 4.0 (affecting the com.threeis.webt

References

← Back to latest CVEs