CVE Explorer

CVE-2026-13163

Open redirect vulnerability (CWE-601) in the _safe_redirect function of the click-tracking endpoint (/c/<token>/) in Mailerup <1.0.0 on all platforms allows remote unauthenticated attackers to redirect victims to arbitrary external sites and conduct phishing attacks via a crafted u query parameter, because the URL scheme is validated (blocking javascript: and data:) but the destination host is not restricted to an allowlist, and a signing.BadSignature exception is silently caught so a valid sign

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f179a16719229e9f98677a63f7b89e20bddbcf5dbdd26f632011a5d92a5ac024

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"defaultStatus":"unaffected","product":"Mailerup","repo":"https://github.com/Maalfer/mailerup","vendor":"Mailerup","versions":[{"lessThan":"1.0.1","status":"affected","version":"0","versionType":"custom"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:2787fe5b79ead764eb31054d4dde593d77920b4e3e944ada4b77f659e71b695c · sha256:041d3ba976168c2c… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.3,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpac…

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:2787fe5b79ead764eb31054d4dde593d77920b4e3e944ada4b77f659e71b695c · sha256:041d3ba976168c2c… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion

{"cweId":"CWE-601","description":"CWE-601 URL redirection to untrusted site ('open redirect')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:2787fe5b79ead764eb31054d4dde593d77920b4e3e944ada4b77f659e71b695c · sha256:041d3ba976168c2c… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion

{"tags":["patch"],"url":"https://github.com/Maalfer/mailerup/commit/99eb6d4586134bf3f4422093fbf47d6794ef0ee5"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:2787fe5b79ead764eb31054d4dde593d77920b4e3e944ada4b77f659e71b695c · sha256:041d3ba976168c2c… · /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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