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CVE-2026-26747

A Host Header Poisoning vulnerability exists in Monica 4.1.2 due to improper handling of the HTTP Host header in app/Providers/AppServiceProvider.php, combined with the default misconfiguration where the "app.force_url" is not set and default is "false". The application generates absolute URLs (such as those used in password reset emails) using the user-supplied Host header. This allows remote attackers to poison the password reset link sent to a victim,
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:c6c515cb3dcf134a7575ac1fa42676195e67bbdbcb1b098a5aedaeacf6dbdd2a
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"description":"n/a","lang":"en","type":"text"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8a30dc54b09444428d7325dec5ac8f51a5cc0b63561b806fe6642826995ce812 · sha256:db1b37cd59533658… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-644","description":"CWE-644 Improper Neutralization of HTTP Headers for Scripting Syntax","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8a30dc54b09444428d7325dec5ac8f51a5cc0b63561b806fe6642826995ce812 · sha256:db1b37cd59533658… · /containers/adp/0/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"n/a","vendor":"n/a","versions":[{"status":"affected","version":"n/a"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8a30dc54b09444428d7325dec5ac8f51a5cc0b63561b806fe6642826995ce812 · sha256:db1b37cd59533658… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8a30dc54b09444428d7325dec5ac8f51a5cc0b63561b806fe6642826995ce812 · sha256:db1b37cd59533658… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"description":"n/a","lang":"en","type":"text"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8a30dc54b09444428d7325dec5ac8f51a5cc0b63561b806fe6642826995ce812 · sha256:db1b37cd59533658… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-644","description":"CWE-644 Improper Neutralization of HTTP Headers for Scripting Syntax","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8a30dc54b09444428d7325dec5ac8f51a5cc0b63561b806fe6642826995ce812 · sha256:db1b37cd59533658… · /containers/adp/0/problemTypes/0/descriptions/0

Source references

2 source assertions
{"url":"https://github.com/hungnqdz/cve-research/blob/main/CVE-2026-26747.md"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8a30dc54b09444428d7325dec5ac8f51a5cc0b63561b806fe6642826995ce812 · sha256:db1b37cd59533658… · /containers/cna/references/1
{"url":"https://github.com/monicahq/monica"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8a30dc54b09444428d7325dec5ac8f51a5cc0b63561b806fe6642826995ce812 · sha256:db1b37cd59533658… · /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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