CVE-2026-23961
Essential information
- Published
- 22/01/2026 02:15
- Modified
- 22/01/2026 02:15
- Author
- —
- Creator
- —
- CVSS
- 5.3 MEDIUM (v3.1)
- CISA KEV
- No
- CWE
- —
- CVSS vector
-
—
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N—
CVSS metrics
- Access vector
- —
- Access complexity
- —
- Authentication
- —
- Confidentiality impact
- —
- Integrity impact
- —
- Availability impact
- —
- Exploitability
- —
- Remediation level
- —
- Report confidence
- —
- Temporal score
- —
- Attack vector
- NETWORK
- Attack complexity
- LOW
- Privileges required
- NONE
- User interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality impact
- NONE
- Integrity impact
- LOW
- Availability impact
- NONE
- Exploit code maturity
- —
- Remediation level
- —
- Report confidence
- —
- Temporal score
- —
- Attack vector
- —
- Attack complexity
- —
- Attack requirements
- —
- Privileges required
- —
- User interaction
- —
- Confidentiality (V)
- —
- Confidentiality (S)
- —
- Integrity (V)
- —
- Integrity (S)
- —
- Availability (V)
- —
- Availability (S)
- —
- Exploit maturity
- —
Description
Mastodon is a free, open-source social network server based on ActivityPub. Mastodon allows server administrators to suspend remote users to prevent interactions. However, some logic errors allow already-known posts from such suspended users to appear in timelines if boosted. Furthermore, under certain circumstances, previously-unknown posts from suspended users can be processed. This issue allows old posts from suspended users to occasionally end up on timelines on all Mastodon versions. Additionally, on Mastodon versions from v4.5.0 to v4.5.4, v4.4.5 to v4.4.11, v4.3.13 to v4.3.17, and v4.2.26 to v4.2.29, remote suspended users can partially bypass the suspension to get new posts in. Mastodon versions v4.5.5, v4.4.12, v4.3.18 are patched.
NVD status
- Status
- Received — CVE has been recently published to the CVE List and has been received by the NVD.
- Source
- [email protected]
- NVD
- View on NVD
Affected products (CPE)
| Product | CPE |
|---|---|
| mastodon / mastodon | cpe:2.3:a:mastodon:mastodon:4.5.0-4.5.4:*:*:*:*:*:*:* |
| mastodon / mastodon | cpe:2.3:a:mastodon:mastodon:4.4.5-4.4.11:*:*:*:*:*:*:* |
| mastodon / mastodon | cpe:2.3:a:mastodon:mastodon:4.3.13-4.3.17:*:*:*:*:*:*:* |
| mastodon / mastodon | cpe:2.3:a:mastodon:mastodon:4.2.26-4.2.29:*:*:*:*:*:*:* |
| mastodon / mastodon | cpe:2.3:a:mastodon:mastodon:4.5.5:*:*:*:*:*:*:* |
| mastodon / mastodon | cpe:2.3:a:mastodon:mastodon:4.4.12:*:*:*:*:*:*:* |
| mastodon / mastodon | cpe:2.3:a:mastodon:mastodon:4.3.18:*:*:*:*:*:*:* |