by Kastro
Paper/Archive/CVE-2023-36459

CVE-2023-36459

mastodon mastodon — Mastodon vulnerable to Cross-site Scripting through oEmbed preview cards

EPSS 1%CVSS 9.3
critical.is priorityof 100
42
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 68.6.686 × 2013.7No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 1.3 and prior to versions 3.5.9, 4.0.5, and 4.1.3, an attacker using carefully crafted oEmbed data can bypass the HTML sanitization performed by Mastodon and include arbitrary HTML in oEmbed preview cards. This introduces a vector for cross-site scripting (XSS) payloads that can be rendered in the user's browser when a preview card for a malicious link is clicked through. Versions 3.5.9, 4.0.5, and 4.1.3 contain a patch for this issue.

Affected

ProductAffectedFixed inSource
mastodon>= 1.3, < 3.5.9–CNA
mastodon>= 4.0.0, < 4.0.5–CNA
mastodon>= 4.1.0, < 4.1.3–CNA

Scores by source

GitHub_M (CNA)9.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/mastodon/mastodon/security/advisories/GHSA-ccm4-vgcc-73hprefgithub.com/mastodon/mastodon/commit/6d8e0fae3e96f3cf4febe03fa7fcf5b95ff761b2refgithub.com/mastodon/mastodon/releases/tag/v3.5.9refgithub.com/mastodon/mastodon/releases/tag/v4.0.5refgithub.com/mastodon/mastodon/releases/tag/v4.1.3refopenwall.com/lists/oss-security/2023/07/06/5