How severe is CVE-2026-26378?

CVE-2026-26378 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-2026-26378 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-26378?

CVE-2026-26378 affects Koha. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-26378?

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

Does CVE-2026-26378 have an EU (EUVD) identifier?

Yes. CVE-2026-26378 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34169.

When was CVE-2026-26378 published?

CVE-2026-26378 was published on 2026-06-03 and last updated on 2026-06-17.

CVE-2026-26378

CVE-2026-26378 is a medium-severity vulnerability in Koha 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% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34169
Weakness: CWE-79
Affected product: Koha
Published: 2026-06-03
Last modified: 2026-06-17

Description

Cross Site Scripting vulnerability in Koha 25.11 and before allows a remote attacker to execute arbitrary code via file upload function in Invoice features

Frequently asked questions

What is CVE-2026-26378?: Cross Site Scripting vulnerability in Koha 25.11 and before allows a remote attacker to execute arbitrary code via file upload function in Invoice features
How severe is CVE-2026-26378?: CVE-2026-26378 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-2026-26378 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-26378?: CVE-2026-26378 affects Koha. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-26378?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-26378 have an EU (EUVD) identifier?: Yes. CVE-2026-26378 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34169.
When was CVE-2026-26378 published?: CVE-2026-26378 was published on 2026-06-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:koha:koha:*:*:*:*:*:*:*:*

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