CVE-2025-62605 json
Mastodon quotes control can be bypassed
published 2025-10-21 12 mo ago modified 2026-10-19 21 d ago also BIT-mastodon-2025-62605 , EUVD-2025-35213 , GHSA-8h43-rcqj-wpc6
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 21%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bitnami mastodon 4.4.8
- joinmastodon mastodon 4.4.8, 4.5.0-beta.2
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 12 mo ago
Exploit prediction
0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
| OSV | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | mastodon | >=4.4.0, <4.4.8 |
4.4.8 |
Affected products
- mastodon mastodon
Classification
- Weakness
-
- CWE-754 Improper Check for Unusual or Exceptional Conditions
References
-
github.com
/mastodon/mastodon/commit/2dc4552229b55e2e4adaef675e68ed7ae123d78e
patch
-
github.com
/mastodon/mastodon/commit/405a49df44033e7d179f3d44d59fb68a67d54789
patch
-
github.com
/mastodon/mastodon/security/advisories/GHSA-8h43-rcqj-wpc6
vendor-advisory, advisory
-
github.com
/mastodon/mastodon/releases/tag/v4.4.8
release-notes, article
-
github.com
/mastodon/mastodon/releases/tag/v4.5.0-beta.2
release-notes, article
-
nvd.nist.gov
/vuln/detail/CVE-2025-62605
web
Sources
- CVE List CVE-2025-62605
- NVD CVE-2025-62605
- OSV BIT-mastodon-2025-62605
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.