How severe is CVE-2026-40479?

CVE-2026-40479 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-2026-40479 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40479?

CVE-2026-40479 affects Kimai. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40479?

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

Does CVE-2026-40479 have an EU (EUVD) identifier?

Yes. CVE-2026-40479 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23575.

When was CVE-2026-40479 published?

CVE-2026-40479 was published on 2026-04-17 and last updated on 2026-06-17.

CVE-2026-40479

CVE-2026-40479 is a medium-severity vulnerability in Kimai 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)
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-23575
Weakness: CWE-79
Affected product: Kimai
Published: 2026-04-17
Last modified: 2026-06-17

Description

Kimai is an open-source time tracking application. In versions 1.16.3 through 2.52.0, the escapeForHtml() function in KimaiEscape.js does not escape double quote or single quote characters. When a user's profile alias is inserted into an HTML attribute context via the team member form prototype and rendered through innerHTML, this incomplete escaping allows HTML attribute injection. An authenticated user with ROLE_USER privileges can store a malicious alias that executes JavaScript in the browser of any administrator viewing the team form, resulting in stored XSS with privilege escalation. This issue has been fixed in version 2.53.0.

Frequently asked questions

What is CVE-2026-40479?: Kimai is an open-source time tracking application. In versions 1.16.3 through 2.52.0, the escapeForHtml() function in KimaiEscape.js does not escape double quote or single quote characters. When a user's profile alias is inserted into an HTML attribute context via the team member form prototype and rendered through innerHTML, this incomplete escaping allows HTML attribute injection. An authenticated user with ROLE_USER privileges can store a malicious alias that executes JavaScript in the browser of any administrator viewing the team form, resulting in stored XSS with privilege escalation. This issue has been fixed in version 2.53.0.
How severe is CVE-2026-40479?: CVE-2026-40479 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-2026-40479 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40479?: CVE-2026-40479 affects Kimai. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40479?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-40479 have an EU (EUVD) identifier?: Yes. CVE-2026-40479 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23575.
When was CVE-2026-40479 published?: CVE-2026-40479 was published on 2026-04-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:kimai:kimai:*:*:*:*:*:*:*:*

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