CVE-2026-26378
Koha Cross-Site Scripting via Invoice File Upload
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
INFO
Published Date :
June 3, 2026, 7:16 p.m.
Last Modified :
June 4, 2026, 6:49 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update Koha to version 25.11 or later.
- Apply vendor patches for the file upload function.
- Restrict file upload functionality if possible.
- Sanitize all user-supplied input carefully.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-26378.
| URL | Resource |
|---|---|
| https://g03m0n.github.io | Third Party Advisory |
| https://g03m0n.github.io/posts/cve-2026-26378/ | Exploit Third Party Advisory |
| https://github.com/Koha-Community/Koha | Product |
| https://g03m0n.github.io/posts/cve-2026-26378/ | Exploit Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-26378 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-26378
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-26378 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-26378 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jun. 04, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:koha:koha:*:*:*:*:*:*:*:* versions up to (including) 25.11.00 Added Reference Type MITRE: https://g03m0n.github.io Types: Third Party Advisory Added Reference Type CISA-ADP: https://g03m0n.github.io/posts/cve-2026-26378/ Types: Exploit, Third Party Advisory Added Reference Type MITRE: https://g03m0n.github.io/posts/cve-2026-26378/ Types: Exploit, Third Party Advisory Added Reference Type MITRE: https://github.com/Koha-Community/Koha Types: Product -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 04, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Added CWE CWE-79 Added Reference https://g03m0n.github.io/posts/cve-2026-26378/ -
New CVE Received by [email protected]
Jun. 03, 2026
Action Type Old Value New Value Added 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 Added Reference https://g03m0n.github.io Added Reference https://g03m0n.github.io/posts/cve-2026-26378/ Added Reference https://github.com/Koha-Community/Koha