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01 Record

CVE-2026-72916

Mastodon: SSRF Protection Bypass via IPv4-compatible IPv6 Addresses

MediumPUBLISHEDCNA: GitHub_M
CNA base score6.3 CVSS v4.0CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L
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02 Description

Mastodon: SSRF Protection Bypass via IPv4-compatible IPv6 Addresses

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.58% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 47.8% of scored records. A rank, not a probability.
NVD base score
6.3 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD analysis status
Deferred. NVD last modified this record on 2026-09-09.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-08-10 21:19Z2 MO AGO
Last updated
2026-08-13 15:13Z2 MO AGO
Reserved
2026-08-10
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
Medium (CVSS 6.3)
CNA CVSS vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L
Weaknesses
  • CWE-918Server-Side Request Forgery (SSRF)Base
  • CWE-1286Improper Validation of Syntactic Correctness of InputBase
Data version
5.2
Document digest
a75e901cda0c70d8adeb494fb0913e097d0a2eb03d0b4e2eee84c61ed8994c3d

05 Affected products

VendorProductVersionsPlatforms
mastodonmastodon< 4.4.21, >= 4.5.0-beta.1, < 4.5.14, >= 4.6.0-beta.1, < 4.6.4—

06 References