CVE Explorer

CVE-2026-21859

Mailpit is an email testing tool and API for developers. Versions 1.28.0 and below have a Server-Side Request Forgery (SSRF) vulnerability in the /proxy endpoint, allowing attackers to make requests to internal network resources. The /proxy endpoint validates http:// and https:// schemes, but it does not block internal IP addresses, enabling attackers to access internal services and APIs. This vulnerability is limited to HTTP GET requests with minimal headers. The issue is fixed in version 1.28.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:eadeee9d96f9087c500447f8770447834793aaeedfab7e74e925ce2c5e427da2

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"mailpit","vendor":"axllent","versions":[{"status":"affected","version":"< 1.28.1"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:a9addbc44fed02687018c11ba3f2a133adb9f2b08b5e1222f1af513da3f277a1 · sha256:cb85330cd98f8cad… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.8,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:a9addbc44fed02687018c11ba3f2a133adb9f2b08b5e1222f1af513da3f277a1 · sha256:cb85330cd98f8cad… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-918","description":"CWE-918: Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:a9addbc44fed02687018c11ba3f2a133adb9f2b08b5e1222f1af513da3f277a1 · sha256:cb85330cd98f8cad… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions

{"name":"https://github.com/axllent/mailpit/commit/3b9b470c093b3d20b7d751722c1c24f3eed2e19d","tags":["x_refsource_MISC"],"url":"https://github.com/axllent/mailpit/commit/3b9b470c093b3d20b7d751722c1c24f3eed2e19d"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a9addbc44fed02687018c11ba3f2a133adb9f2b08b5e1222f1af513da3f277a1 · sha256:cb85330cd98f8cad… · /containers/cna/references/1

{"name":"https://github.com/axllent/mailpit/security/advisories/GHSA-8v65-47jx-7mfr","tags":["x_refsource_CONFIRM"],"url":"https://github.com/axllent/mailpit/security/advisories/GHSA-8v65-47jx-7mfr"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a9addbc44fed02687018c11ba3f2a133adb9f2b08b5e1222f1af513da3f277a1 · sha256:cb85330cd98f8cad… · /containers/cna/references/0

{"tags":["exploit"],"url":"https://github.com/axllent/mailpit/security/advisories/GHSA-8v65-47jx-7mfr"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a9addbc44fed02687018c11ba3f2a133adb9f2b08b5e1222f1af513da3f277a1 · sha256:cb85330cd98f8cad… · /containers/adp/0/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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