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CVE-2026-27477: Server-Side Request Forgery (SSRF)

🗓️ 24 Feb 2026 00:00:00Reported by Rapid7Type 
rapid7
 rapid7
🔗 www.rapid7.com👁 7 Views

Unauthenticated SSRF in Mastodon 4.4.0-4.4.13, 4.5.0-4.5.6 via FASP registration base_url.

Related
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-27477
24 Feb 202619:00
–attackerkb
circl
Circl
CVE-2026-27477
20 Feb 202620:55
–circl
cnnvd
CNNVD
Mastodon code issues and vulnerabilities
24 Feb 202600:00
–cnnvd
cve
CVE
CVE-2026-27477
24 Feb 202619:00
–cve
cvelist
Cvelist
CVE-2026-27477 Mastodon has SSRF via unvalidated FASP Provider base_url
24 Feb 202619:00
–cvelist
mend
Mend
CVE-2026-27477
24 Feb 202619:00
–mend
nvd
NVD
CVE-2026-27477
24 Feb 202620:27
–nvd
osv_bit
osv_bit
BIT-MASTODON-2026-27477 Mastodon has SSRF via unvalidated FASP Provider base_url
2 Mar 202608:42
–osv_bit
ptsecurity
Positive Technologies
PT-2026-21343
20 Feb 202600:00
–ptsecurity
redhatcve
RedhatCVE
CVE-2026-27477
25 Feb 202622:18
–redhatcve

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26 Feb 2026 00:00Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.15.9
CVSS 48.2
EPSS0.0031
7