How severe is CVE-2025-40633?

CVE-2025-40633 has a CVSS 4.0 base score of 5.1, rated medium severity.

Is CVE-2025-40633 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.

How do I fix CVE-2025-40633?

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

Does CVE-2025-40633 have an EU (EUVD) identifier?

Yes. CVE-2025-40633 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-15815.

When was CVE-2025-40633 published?

CVE-2025-40633 was published on 2025-05-20 and last updated on 2026-06-17.

CVE-2025-40633

CVE-2025-40633 is a medium-severity vulnerability with a CVSS 4.0 base score of 5.1. 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 4.0 base score 5.1)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-15815
Weakness: CWE-79
Published: 2025-05-20
Last modified: 2026-06-17

Description

A Stored Cross-Site Scripting (XSS) vulnerability has been found in Koibox for versions prior to e8cbce2. This vulnerability allows an authenticated attacker to upload an image containing malicious JavaScript code as profile picture in the '/es/dashboard/clientes/ficha/' endpoint

Frequently asked questions

What is CVE-2025-40633?: A Stored Cross-Site Scripting (XSS) vulnerability has been found in Koibox for versions prior to e8cbce2. This vulnerability allows an authenticated attacker to upload an image containing malicious JavaScript code as profile picture in the '/es/dashboard/clientes/ficha/' endpoint
How severe is CVE-2025-40633?: CVE-2025-40633 has a CVSS 4.0 base score of 5.1, rated medium severity.
Is CVE-2025-40633 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.
How do I fix CVE-2025-40633?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-40633 have an EU (EUVD) identifier?: Yes. CVE-2025-40633 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-15815.
When was CVE-2025-40633 published?: CVE-2025-40633 was published on 2025-05-20 and last updated on 2026-06-17.

References

https://www.incibe.es/en/incibe-cert/notices/aviso/stored-cross-site-scripting-xss-koibox

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →