CVE Explorer

CVE-2026-23845

Mailpit is an email testing tool and API for developers. Versions prior to 1.28.3 are vulnerable to Server-Side Request Forgery (SSRF) via HTML Check CSS Download. The HTML Check feature (`/api/v1/message/{ID}/html-check`) is designed to analyze HTML emails for compatibility. During this process, the `inlineRemoteCSS()` function automatically downloads CSS files from external `<link rel="stylesheet" href="...">` tags to inline them for testing. Version 1.28.3 fixes the issue.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:14f6eb64124c2268e68bd448fe2eb3e280c7ba47c9d48127d122699ba4958d46

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"mailpit","vendor":"axllent","versions":[{"status":"affected","version":"< 1.28.3"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:0e9c8e65b5b12fa383b9c0b286e4cd9dd2b2db69622d6f45746f6142c99586c0 · sha256:413faff6f2f490d5… · /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:v2:0e9c8e65b5b12fa383b9c0b286e4cd9dd2b2db69622d6f45746f6142c99586c0 · sha256:413faff6f2f490d5… · /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:v2:0e9c8e65b5b12fa383b9c0b286e4cd9dd2b2db69622d6f45746f6142c99586c0 · sha256:413faff6f2f490d5… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions

{"name":"https://github.com/axllent/mailpit/commit/1679a0aba592ebc8487a996d37fea8318c984dfe","tags":["x_refsource_MISC"],"url":"https://github.com/axllent/mailpit/commit/1679a0aba592ebc8487a996d37fea8318c984dfe"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:0e9c8e65b5b12fa383b9c0b286e4cd9dd2b2db69622d6f45746f6142c99586c0 · sha256:413faff6f2f490d5… · /containers/cna/references/1

{"name":"https://github.com/axllent/mailpit/releases/tag/v1.28.3","tags":["x_refsource_MISC"],"url":"https://github.com/axllent/mailpit/releases/tag/v1.28.3"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:0e9c8e65b5b12fa383b9c0b286e4cd9dd2b2db69622d6f45746f6142c99586c0 · sha256:413faff6f2f490d5… · /containers/cna/references/2

{"name":"https://github.com/axllent/mailpit/security/advisories/GHSA-6jxm-fv7w-rw5j","tags":["x_refsource_CONFIRM"],"url":"https://github.com/axllent/mailpit/security/advisories/GHSA-6jxm-fv7w-rw5j"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:0e9c8e65b5b12fa383b9c0b286e4cd9dd2b2db69622d6f45746f6142c99586c0 · sha256:413faff6f2f490d5… · /containers/cna/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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