How severe is CVE-2022-4866?

CVE-2022-4866 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2022-4866 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-4866?

CVE-2022-4866 affects Usememos Memos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2022-4866?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2022-4866 published?

CVE-2022-4866 was published on 2022-12-31 and last updated on 2026-06-17.

CVE-2022-4866

CVE-2022-4866 is a critical-severity vulnerability in Usememos Memos with a CVSS 3.x base score of 9.0. 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: Critical (CVSS 3.x base score 9.0)
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Usememos Memos
Published: 2022-12-31
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2022-4866?: Cross-site Scripting (XSS) - Stored in GitHub repository usememos/memos prior to 0.9.1.
How severe is CVE-2022-4866?: CVE-2022-4866 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2022-4866 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-4866?: CVE-2022-4866 affects Usememos Memos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2022-4866?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2022-4866 published?: CVE-2022-4866 was published on 2022-12-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:usememos:memos:*:*:*:*:*:*:*:*

More vulnerabilities in Usememos Memos

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CVE-2022-4686 — Critical (CVSS 9.8): Authorization Bypass Through User-Controlled Key in GitHub repository usememos/memos prior to 0.9.0.
CVE-2022-4865 — Critical (CVSS 9.0): Cross-site Scripting (XSS) - Stored in GitHub repository usememos/memos prior to 0.9.1.
CVE-2023-5036 — High (CVSS 8.8): Cross-Site Request Forgery (CSRF) in GitHub repository usememos/memos prior to 0.15.1.

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