What is CVE-2021-46251?

CVE-2021-46251 is a medium-severity vulnerability in Scratchoauth2 Project, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-02-15.

How severe is CVE-2021-46251?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Scratchoauth2 Project

CVE-2021-46251

A reflected cross-site scripting (XSS) in ScratchOAuth2 before commit 1603f04e44ef67dde6ccffe866d2dca16defb293 allows attackers to execute arbitrary web scripts or HTML via a crafted POST request.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-02-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (44.7th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Scratchoauth2 Project

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/ScratchVerifier/ScratchOAuth2/commit/1603f04e44ef67dde6ccffe866d2dca… (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-46251?: CVE-2021-46251 is a medium-severity vulnerability in Scratchoauth2 Project, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2022-02-15.
How severe is CVE-2021-46251?: Medium severity. CVSS v3 base score is 6.1 out of 10.