CVE-2023-42450

highpriority · track · 30EPSS 0.005 · 40 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.46% (40th) EPSS

CVSS 7.5 · high

Is it mine?

10 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.4–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU

v3.15.4mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:Nsecondary · ENISA EU

v3.15.4mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:Nsecondary · security-advisories@github.comexploitability 2.2 · impact 2.7

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-113USCWE-113USCWE-918USCWE-918US

affected products (10)

Products and version ranges known to be affected.

mastodon mastodon4.2.0-beta1, → 4.2.0-rc2enisa_euvdEU
Mastodon gGmbH Mastodon≤ 4.2.0-rc1fstec_bduRU
Mastodon gGmbH Mastodon≤ 4.2.0-beta3fstec_bduRU
Mastodon gGmbH Mastodon≤ 4.2.0-beta2fstec_bduRU
Mastodon gGmbH Mastodon≤ 4.2.0-beta1fstec_bduRU
joinmastodon mastodon= 4.2.0nvdUScpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*
Bitnami mastodon4.2.0-beta1 → 4.2.0osvUSpkg:bitnami/mastodon
Bitnami mastodon4.2.0-beta2 → 4.2.0osvUSpkg:bitnami/mastodon
Bitnami mastodon4.2.0-beta3 → 4.2.0osvUSpkg:bitnami/mastodon
Bitnami mastodon4.2.0-rc1 → 4.2.0osvUSpkg:bitnami/mastodon

advisories (1)

Vendor and ecosystem advisories describing this.

BIT-mastodon-2023-42450Mastodon Server-Side Request Forgery vulnerability2024-03-06vendor · osvUS
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.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu osv nvd NVD CVE.org MITRE

published 2023-09-19modified 2026-06-17

references (7)

External citations — patches, advisories, analysis.

scry

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