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CVE-2026-33916

Handlebars provides the power necessary to let users build semantic templates. In versions 4.0.0 through 4.7.8, `resolvePartial()` in the Handlebars runtime resolves partial names via a plain property lookup on `options.partials` without guarding against prototype-chain traversal. When `Object.prototype` has been polluted with a string value whose key matches a partial reference in a template, the polluted string is used as the partial body and rendered without HTML escaping, resulting in reflec
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:97947d39a56d6b29efa412a8835be40398c67074a335be94cdc13000e0e0ed5b
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

{"cweId":"CWE-1321","description":"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:48ab942f05140388fab3540b14f6b566e441b47e7ad20a611e6ea3a6140f7021 · sha256:8b185cb1349cdb19… · /containers/cna/problemTypes/1/descriptions/0

{"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:v2:48ab942f05140388fab3540b14f6b566e441b47e7ad20a611e6ea3a6140f7021 · sha256:8b185cb1349cdb19… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"handlebars.js","vendor":"handlebars-lang","versions":[{"status":"affected","version":">= 4.0.0, < 4.7.9"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:48ab942f05140388fab3540b14f6b566e441b47e7ad20a611e6ea3a6140f7021 · sha256:8b185cb1349cdb19… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.7,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/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:v2:48ab942f05140388fab3540b14f6b566e441b47e7ad20a611e6ea3a6140f7021 · sha256:8b185cb1349cdb19… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-1321","description":"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:48ab942f05140388fab3540b14f6b566e441b47e7ad20a611e6ea3a6140f7021 · sha256:8b185cb1349cdb19… · /containers/cna/problemTypes/1/descriptions/0
{"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:v2:48ab942f05140388fab3540b14f6b566e441b47e7ad20a611e6ea3a6140f7021 · sha256:8b185cb1349cdb19… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2","tags":["x_refsource_MISC"],"url":"https://github.com/handlebars-lang/handlebars.js/commit/68d8df5a88e0a26fe9e6084c5c6aaebe67b07da2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:48ab942f05140388fab3540b14f6b566e441b47e7ad20a611e6ea3a6140f7021 · sha256:8b185cb1349cdb19… · /containers/cna/references/1
{"name":"https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9","tags":["x_refsource_MISC"],"url":"https://github.com/handlebars-lang/handlebars.js/releases/tag/v4.7.9"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:48ab942f05140388fab3540b14f6b566e441b47e7ad20a611e6ea3a6140f7021 · sha256:8b185cb1349cdb19… · /containers/cna/references/2
{"name":"https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-2qvq-rjwj-gvw9","tags":["x_refsource_CONFIRM"],"url":"https://github.com/handlebars-lang/handlebars.js/security/advisories/GHSA-2qvq-rjwj-gvw9"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:48ab942f05140388fab3540b14f6b566e441b47e7ad20a611e6ea3a6140f7021 · sha256:8b185cb1349cdb19… · /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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