CVE-2023-42450

low-risk
Published 2023-09-19

Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 4.2.0-beta1 and prior to version 4.2.0-rc2, by crafting specific input, attackers can inject arbitrary data into HTTP requests issued by Mastodon. This can be used to perform confused deputy attacks if the server configuration includes `ALLOWED_PRIVATE_ADDRESSES` to allow access to local exploitable services. Version 4.2.0-rc2 has a patch for the issue.

Do I need to act?

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0.46% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.4/10 Medium
NETWORK / HIGH complexity

Affected Products (4)

Affected Vendors

Joinmastodon

References (4)

Patch https://github.com/mastodon/mastodon/commit/94893cf24fc95b32cc7a756262acbe008c20...
Vendor Advisory https://github.com/mastodon/mastodon/security/advisories/GHSA-hcqf-fw2r-52g4
Patch https://github.com/mastodon/mastodon/commit/94893cf24fc95b32cc7a756262acbe008c20...
Vendor Advisory https://github.com/mastodon/mastodon/security/advisories/GHSA-hcqf-fw2r-52g4
29
/ 100
low-risk
Severity 17/34 · Moderate
Exploitability 2/34 · Minimal
Exposure 10/34 · Low