What is CVE-2023-0300?

CVE-2023-0300 is a medium-severity vulnerability in Alfio-Event Alfio-Event/alf.io, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-01-14.

How severe is CVE-2023-0300?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Alfio-Event Alfio-Event/alf.io

CVE-2023-0300

Cross-site Scripting (XSS) - Reflected in GitHub repository alfio-event/alf.io prior to 2.0-M4-2301.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-01-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (39.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Alfio-Event Alfio-Event/alf.io — versions unspecified
Opencollective Alf.io

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

huntr.dev/bounties/0a91fec7-a76e-4ca3-80ba-81de1f10d59d (Exploit, Third Party Advisory)
github.com/alfio-event/alf.io/commit/c1ae54ac84f1c7a5ec2831876f6445cb79be96fc (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2023-0300?: CVE-2023-0300 is a medium-severity vulnerability in Alfio-Event Alfio-Event/alf.io, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-01-14.
How severe is CVE-2023-0300?: Medium severity. CVSS v3 base score is 5.4 out of 10.