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CVE-2026-27120

Leafkit is a templating language with Swift-inspired syntax. Prior to 1.4.1, htmlEscaped in leaf-kit will only escape html special characters if the extended grapheme clusters match, which allows bypassing escaping by using an extended grapheme cluster containing both the special html character and some additional characters. In the case of html attributes, this can lead to XSS if there is a leaf variable in the attribute that is user controlled. This vulnerability is fixed in 1.4.1.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:5559cef1f25be0fef8084f0673341f329c622b2bdf601492870f3c330caf2933
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 3 assertions

{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cef8064cd308348d4a66b96e52183cef3065e1d4e08cb1b0e50ea78a4738081f · sha256:fc052833f68bc904… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-87","description":"CWE-87: Improper Neutralization of Alternate XSS Syntax","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cef8064cd308348d4a66b96e52183cef3065e1d4e08cb1b0e50ea78a4738081f · sha256:fc052833f68bc904… · /containers/cna/problemTypes/2/descriptions/0

{"cweId":"CWE-75","description":"CWE-75: Failure to Sanitize Special Elements into a Different Plane (Special Element Injection)","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cef8064cd308348d4a66b96e52183cef3065e1d4e08cb1b0e50ea78a4738081f · sha256:fc052833f68bc904… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"leaf-kit","vendor":"vapor","versions":[{"status":"affected","version":"< 1.4.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:cef8064cd308348d4a66b96e52183cef3065e1d4e08cb1b0e50ea78a4738081f · sha256:fc052833f68bc904… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:cef8064cd308348d4a66b96e52183cef3065e1d4e08cb1b0e50ea78a4738081f · sha256:fc052833f68bc904… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

3 source assertions
{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cef8064cd308348d4a66b96e52183cef3065e1d4e08cb1b0e50ea78a4738081f · sha256:fc052833f68bc904… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-87","description":"CWE-87: Improper Neutralization of Alternate XSS Syntax","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cef8064cd308348d4a66b96e52183cef3065e1d4e08cb1b0e50ea78a4738081f · sha256:fc052833f68bc904… · /containers/cna/problemTypes/2/descriptions/0
{"cweId":"CWE-75","description":"CWE-75: Failure to Sanitize Special Elements into a Different Plane (Special Element Injection)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cef8064cd308348d4a66b96e52183cef3065e1d4e08cb1b0e50ea78a4738081f · sha256:fc052833f68bc904… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/vapor/leaf-kit/commit/8919e39476c3a4ba05c28b71546bb9195f87ef34","tags":["x_refsource_MISC"],"url":"https://github.com/vapor/leaf-kit/commit/8919e39476c3a4ba05c28b71546bb9195f87ef34"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:cef8064cd308348d4a66b96e52183cef3065e1d4e08cb1b0e50ea78a4738081f · sha256:fc052833f68bc904… · /containers/cna/references/1
{"name":"https://github.com/vapor/leaf-kit/security/advisories/GHSA-4hfh-fch3-5q7p","tags":["x_refsource_CONFIRM"],"url":"https://github.com/vapor/leaf-kit/security/advisories/GHSA-4hfh-fch3-5q7p"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:cef8064cd308348d4a66b96e52183cef3065e1d4e08cb1b0e50ea78a4738081f · sha256:fc052833f68bc904… · /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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