CVE-2023-36459

MediumCVSS 6.1/10Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.1 6.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
mastodon	mastodon	>= 1.3, < 3.5.9; >= 4.0.0, < 4.0.5; >= 4.1.0, < 4.1.3

References

http://www.openwall.com/lists/oss-security/2023/07/06/5Mailing List
https://github.com/mastodon/mastodon/commit/6d8e0fae3e96f3cf4febe03fa7fcf5b95ff761b2Patch, Third Party Advisory
https://github.com/mastodon/mastodon/releases/tag/v3.5.9Third Party Advisory
https://github.com/mastodon/mastodon/releases/tag/v4.0.5Third Party Advisory
https://github.com/mastodon/mastodon/releases/tag/v4.1.3Third Party Advisory
https://github.com/mastodon/mastodon/security/advisories/GHSA-ccm4-vgcc-73hpThird Party Advisory
http://www.openwall.com/lists/oss-security/2023/07/06/5Mailing List
https://github.com/mastodon/mastodon/commit/6d8e0fae3e96f3cf4febe03fa7fcf5b95ff761b2Patch, Third Party Advisory
https://github.com/mastodon/mastodon/releases/tag/v3.5.9Third Party Advisory
https://github.com/mastodon/mastodon/releases/tag/v4.0.5Third Party Advisory
https://github.com/mastodon/mastodon/releases/tag/v4.1.3Third Party Advisory
https://github.com/mastodon/mastodon/security/advisories/GHSA-ccm4-vgcc-73hpThird Party Advisory

Timeline

Published: Jul 6, 2023
Last modified: Jun 17, 2026
NVD status: Modified

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