Is CVE-2025-62605 in the CISA KEV catalog?

No. CVE-2025-62605 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-62605?

CVE-2025-62605 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2025-62605?

CVE-2025-62605 has an EPSS score of 0.26% (17th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-62605?

Upgrade mastodon to 4.4.8 or later.

CVE & CISA-KEV Catalog

CVE-2025-62605

MEDIUM

4.3

CVSS v3

NVD

Description

Mastodon is a free, open-source social network server based on ActivityPub. In Mastodon version 4.4, support for verifiable quote posts with quote controls was added, but it is possible for an attacker to bypass these controls in Mastodon versions prior to 4.4.8 and 4.5.0-beta.2. Mastodon internally treats reblogs as statuses. Since they were not special-treated, an attacker could reblog any post, then quote their reblog, technically quoting themselves, but having the quote feature a preview of the post they did not get authorization for with all of the affordances that would be otherwise denied by the quote controls. This issue has been patched in versions 4.4.8 and 4.5.0-beta.2.

CWE-754

How to fix

Remediation Available

mastodonNVD

Affected:>= 4.4.0, < 4.4.8Fixed in:4.4.8CVE-2025-62605derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Exploit Intelligence

0.26%probability of exploitation in 30 days

17thpercentile

Low risk: more likely to be exploited than 17% of all known CVEs.

References

Patch2

Vendor Advisory1

github.com

Release Notes2

Related Vulnerabilities

Other CWE-754 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-4367	High	8.8	73%	-	Fix
CVE-2022-39288	High	7.5	59%	-	Fix
CVE-2023-30591	High	7.5	54%	-	-
CVE-2023-41993	High	8.8	29%	KEV	Fix
CVE-2024-43044	High	8.8	29%	-	Fix
CVE-2024-3393	High	7.5	27%	KEV	Fix

Embed a live status badge for CVE-2025-62605

Markdown

[![CVE-2025-62605](https://tridentstack.com/cve/badge/CVE-2025-62605.svg)](https://tridentstack.com/cve/CVE-2025-62605)

HTML

<a href="https://tridentstack.com/cve/CVE-2025-62605"><img src="https://tridentstack.com/cve/badge/CVE-2025-62605.svg" alt="CVE-2025-62605"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-12-12.