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CVE-2026-59710

showdown contains a stored cross-site scripting vulnerability in the parseHeaders function of src/subParsers/makehtml/tables.js that fails to properly escape table header ID attributes. Attackers can inject arbitrary HTML and script-executing SVG elements through double-quote characters in markdown table headers, achieving stored XSS when untrusted markdown is rendered with the default github flavor configuration.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:2add8fdc138a9f5ec309ca123834c82ae9de4b2090776e087d693c8bd958f19e
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"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:v2:2c1fff9f5ac9c563db2c87007a08215db89d43f49bfba70c572fb9a57ab5b954 · sha256:4c2195f300397881… · /containers/cna/metrics/1/cvssV3_1

{"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":"LOW","subIntegrityImpact":"LOW","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:2c1fff9f5ac9c563db2c87007a08215db89d43f49bfba70c572fb9a57ab5b954 · sha256:4c2195f300397881… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","packageURL":"pkg:npm/showdown","product":"showdown","vendor":"showdown","versions":[{"lessThanOrEqual":"2.1.0","status":"affected","version":"0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2c1fff9f5ac9c563db2c87007a08215db89d43f49bfba70c572fb9a57ab5b954 · sha256:4c2195f300397881… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"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:v2:2c1fff9f5ac9c563db2c87007a08215db89d43f49bfba70c572fb9a57ab5b954 · sha256:4c2195f300397881… · /containers/cna/metrics/1/cvssV3_1
{"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":"LOW","subIntegrityImpact":"LOW","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:2c1fff9f5ac9c563db2c87007a08215db89d43f49bfba70c572fb9a57ab5b954 · sha256:4c2195f300397881… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-79","description":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2c1fff9f5ac9c563db2c87007a08215db89d43f49bfba70c572fb9a57ab5b954 · sha256:4c2195f300397881… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"name":"Product","tags":["product"],"url":"https://github.com/showdownjs/showdown"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2c1fff9f5ac9c563db2c87007a08215db89d43f49bfba70c572fb9a57ab5b954 · sha256:4c2195f300397881… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/showdownjs/showdown/commit/e5cab1e9a5dcea2bb3cbf888863fa7e65ab37edf"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2c1fff9f5ac9c563db2c87007a08215db89d43f49bfba70c572fb9a57ab5b954 · sha256:4c2195f300397881… · /containers/cna/references/2
{"tags":["exploit"],"url":"https://github.com/showdownjs/showdown/issues/1046"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2c1fff9f5ac9c563db2c87007a08215db89d43f49bfba70c572fb9a57ab5b954 · sha256:4c2195f300397881… · /containers/adp/0/references/0
{"name":"GitHub Issue","tags":["issue-tracking"],"url":"https://github.com/showdownjs/showdown/issues/1046"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2c1fff9f5ac9c563db2c87007a08215db89d43f49bfba70c572fb9a57ab5b954 · sha256:4c2195f300397881… · /containers/cna/references/0
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/showdown-stored-xss-via-unescaped-table-header-id-attribute-injection"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2c1fff9f5ac9c563db2c87007a08215db89d43f49bfba70c572fb9a57ab5b954 · sha256:4c2195f300397881… · /containers/cna/references/3

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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