Security readout for executives and security teams
Mastodon could display malicious HTML inside link preview cards because crafted oEmbed data bypassed its sanitization. A user would need to interact with a malicious preview, but impact is serious because browser-side script execution can compromise user sessions and data integrity. Exposure is most likely on internet-facing Mastodon servers running versions >=1.3 and <3.5.9, >=4.0.0 and <4.0.5, or >=4.1.0 and <4.1.3. Instances rendering preview cards for untrusted external links are the relevant risk surface. Treat this as urgent for any public Mastodon deployment because it enables high-impact browser compromise through normal social-link workflows. Patch promptly, especially on instances with many users or administrator activity. Mitigation focus: Upgrade Mastodon to 3.5.9, 4.0.5, 4.1.3, or a later fixed release.; Check the Mastodon advisory for branch-specific upgrade guidance.; Prioritize public instances and high-privilege administrative users first..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2023-36459 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N2.85.8Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.3CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/mastodon/mastodon/security/advisories/GHSA-ccm4-vgcc-73hpCVE reference · x_refsource_CONFIRM
- https://github.com/mastodon/mastodon/commit/6d8e0fae3e96f3cf4febe03fa7fcf5b95ff761b2CVE reference · x_refsource_MISC
- https://github.com/mastodon/mastodon/releases/tag/v3.5.9CVE reference · x_refsource_MISC
- https://github.com/mastodon/mastodon/releases/tag/v4.0.5CVE reference · x_refsource_MISC
- https://github.com/mastodon/mastodon/releases/tag/v4.1.3CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.