CVE-2020-28919

CVE-2020-28919 is a medium-severity vulnerability in Checkmk with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

• Severity: Medium (CVSS 3.x base score 5.4)
• CVSS v2: 3.5
• EPSS exploit prediction: 1% (61st percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-79
• Affected product: Checkmk
• Published: 2022-01-15
• Last modified: 2026-06-17

Description

A stored cross site scripting (XSS) vulnerability in Checkmk 1.6.0x prior to 1.6.0p19 allows an authenticated remote attacker to inject arbitrary JavaScript via a javascript: URL in a view title.

Frequently asked questions

What is CVE-2020-28919?

A stored cross site scripting (XSS) vulnerability in Checkmk 1.6.0x prior to 1.6.0p19 allows an authenticated remote attacker to inject arbitrary JavaScript via a javascript: URL in a view title.

How severe is CVE-2020-28919?

CVE-2020-28919 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-28919 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-28919?

CVE-2020-28919 primarily affects Checkmk. In total, 26 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-28919?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-28919 published?

CVE-2020-28919 was published on 2022-01-15 and last updated on 2026-06-17.

References

• https://checkmk.com/check_mk-werks.php?werk_id=11501
• https://emacsninja.com/posts/cve-2020-28919-stored-xss-in-checkmk-160p18.html
• https://github.com/tribe29/checkmk/commit/c00f450f884d8a229b7d8ab3f0452ed802a1ae04
• https://github.com/tribe29/checkmk/commit/e7fd8e4c90be490e4293ec91804d00ec01af5ca6

Affected products (26)

• cpe:2.3:a:checkmk:checkmk:1.6.0:-:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:b1:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:b10:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:b12:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:b3:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:b4:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:b5:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:b9:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:p1:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:p10:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:p11:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:p12:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:p13:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:p14:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:p15:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:p16:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:p17:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:p18:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:p2:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:p3:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:p4:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:p5:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:p6:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:p7:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:p8:*:*:*:*:*:*
• cpe:2.3:a:checkmk:checkmk:1.6.0:p9:*:*:*:*:*:*

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