What is CVE-2025-67500?

CVE-2025-67500 is a low-severity vulnerability in Joinmastodon Mastodon, classified under Observable Response Discrepancy. CVSS score: 3.7/10. Published 2025-12-10.

How severe is CVE-2025-67500?

Low severity. CVSS v3 base score is 3.7 out of 10.

Vulnerability in Joinmastodon Mastodon

CVE-2025-67500

Mastodon is a free, open-source social network server based on ActivityPub. Versions 4.2.27 and prior, 4.3.0-beta.1 through 4.3.14, 4.4.0-beta.1 through 4.4.9, 4.5.0-beta.1 through 4.5.2 have discrepancies in error handling which allow che…

EPSS: 0.002 (8.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Joinmastodon Mastodon
Mastodon — versions < 4.2.28, >= 4.3.0-beta.1, < 4.3.15, >= 4.4.0-beta.1, < 4.4.10

Weakness classification (CWE)

CWE-204 — Observable Response Discrepancy

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2025-67500?: CVE-2025-67500 is a low-severity vulnerability in Joinmastodon Mastodon, classified under Observable Response Discrepancy. CVSS score: 3.7/10. Published 2025-12-10.
How severe is CVE-2025-67500?: Low severity. CVSS v3 base score is 3.7 out of 10.