XSS in Joinmastodon Mastodon
CVE-2023-36459
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 b…
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.012 (65.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N.
Affected products
- Joinmastodon Mastodon
- Mastodon — versions >= 1.3, < 3.5.9, >= 4.0.0, < 4.0.5, >= 4.1.0, < 4.1.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (Mailing List)
Frequently asked questions
- What is CVE-2023-36459?
- CVE-2023-36459 is a critical-severity vulnerability in Joinmastodon Mastodon, classified under Cross-site Scripting. CVSS score: 9.3/10. Published 2023-07-06.
- How severe is CVE-2023-36459?
- Critical severity. CVSS v3 base score is 9.3 out of 10.
- Is CVE-2023-36459 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.