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CVE-2026-45491

Improper link resolution before file access ('link following') in .NET allows an unauthorized attacker to perform tampering locally.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:bbd1040a3d7911db92d22e784118238b18b14f5562165444a6025da6b2d40369
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 4 assertions

{"product":".NET 8.0","vendor":"Microsoft","versions":[{"lessThan":"8.0.28","status":"affected","version":"8.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c45c5de956cb23abf0c2ec7cee96d46fb56dbb522a5074c8e82168d1718d7060 · sha256:3d15dbe593f8b5e6… · /containers/cna/affected/2

{"product":".NET 8.0","vendor":"Microsoft","versions":[{"lessThan":"8.0.28","status":"affected","version":"8.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c45c5de956cb23abf0c2ec7cee96d46fb56dbb522a5074c8e82168d1718d7060 · sha256:3d15dbe593f8b5e6… · /containers/cna/affected/1

{"product":".NET 9.0","vendor":"Microsoft","versions":[{"lessThan":"9.0.17","status":"affected","version":"9.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c45c5de956cb23abf0c2ec7cee96d46fb56dbb522a5074c8e82168d1718d7060 · sha256:3d15dbe593f8b5e6… · /containers/cna/affected/3

{"product":".NET 10.0","vendor":"Microsoft","versions":[{"lessThan":"10.0.9","status":"affected","version":"10.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c45c5de956cb23abf0c2ec7cee96d46fb56dbb522a5074c8e82168d1718d7060 · sha256:3d15dbe593f8b5e6… · /containers/cna/affected/0

Affected products and versions

4 source assertions
{"product":".NET 8.0","vendor":"Microsoft","versions":[{"lessThan":"8.0.28","status":"affected","version":"8.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c45c5de956cb23abf0c2ec7cee96d46fb56dbb522a5074c8e82168d1718d7060 · sha256:3d15dbe593f8b5e6… · /containers/cna/affected/2
{"product":".NET 8.0","vendor":"Microsoft","versions":[{"lessThan":"8.0.28","status":"affected","version":"8.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c45c5de956cb23abf0c2ec7cee96d46fb56dbb522a5074c8e82168d1718d7060 · sha256:3d15dbe593f8b5e6… · /containers/cna/affected/1
{"product":".NET 9.0","vendor":"Microsoft","versions":[{"lessThan":"9.0.17","status":"affected","version":"9.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c45c5de956cb23abf0c2ec7cee96d46fb56dbb522a5074c8e82168d1718d7060 · sha256:3d15dbe593f8b5e6… · /containers/cna/affected/3
{"product":".NET 10.0","vendor":"Microsoft","versions":[{"lessThan":"10.0.9","status":"affected","version":"10.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c45c5de956cb23abf0c2ec7cee96d46fb56dbb522a5074c8e82168d1718d7060 · sha256:3d15dbe593f8b5e6… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":6.2,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c45c5de956cb23abf0c2ec7cee96d46fb56dbb522a5074c8e82168d1718d7060 · sha256:3d15dbe593f8b5e6… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-59","description":"CWE-59: Improper Link Resolution Before File Access ('Link Following')","lang":"en-US","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c45c5de956cb23abf0c2ec7cee96d46fb56dbb522a5074c8e82168d1718d7060 · sha256:3d15dbe593f8b5e6… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":".NET Tampering Vulnerability","tags":["vendor-advisory","patch"],"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45491"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c45c5de956cb23abf0c2ec7cee96d46fb56dbb522a5074c8e82168d1718d7060 · sha256:3d15dbe593f8b5e6… · /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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