What is CVE-2022-31263?

CVE-2022-31263 is a medium-severity vulnerability in Joinmastodon Mastodon. CVSS score: 5.3/10. Published 2022-05-24.

How severe is CVE-2022-31263?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Joinmastodon Mastodon

CVE-2022-31263

app/models/user.rb in Mastodon before 3.5.0 allows a bypass of e-mail restrictions.

Published 2022-05-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (57.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.009 · change: +0.000

Affected products

Joinmastodon Mastodon

References

github.com/mastodon/mastodon/pull/17909 (Patch, Third Party Advisory)
github.com/mastodon/mastodon/releases/tag/v3.5.0 (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2022-31263?: CVE-2022-31263 is a medium-severity vulnerability in Joinmastodon Mastodon. CVSS score: 5.3/10. Published 2022-05-24.
How severe is CVE-2022-31263?: Medium severity. CVSS v3 base score is 5.3 out of 10.