What is CVE-2022-4866?

CVE-2022-4866 is a critical-severity vulnerability in Usememos Memos, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2022-12-31.

How severe is CVE-2022-4866?

Critical severity. CVSS v3 base score is 9.0 out of 10.

XSS in Usememos Memos

CVE-2022-4866

Cross-site Scripting (XSS) - Stored in GitHub repository usememos/memos prior to 0.9.1.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-12-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.010 (62.8th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: +0.000

Affected products

Usememos Memos
Usememos Usememos/memos — versions unspecified

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

huntr.dev/bounties/39c04778-6228-4f07-bdd4-ab17f246dbff (Exploit, Third Party Advisory)
github.com/usememos/memos/commit/7670c9536000bb32c6345d4906a91268dcddd5fc (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2022-4866?: CVE-2022-4866 is a critical-severity vulnerability in Usememos Memos, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2022-12-31.
How severe is CVE-2022-4866?: Critical severity. CVSS v3 base score is 9.0 out of 10.