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CVE-2026-27122

svelte performance oriented web framework. Prior to 5.51.5, when using <svelte:element this={tag}> in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can result in HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8e0a9c06f98c0e83ee89003c8791c813e8dc05a533d209f14475a6094b3dde6f
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"svelte","vendor":"sveltejs","versions":[{"status":"affected","version":"< 5.51.5"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e5580270250705a8a9b4554f46dedc438bd12cca3c835438dd25f46ebfaaaf52 · sha256:083d1915325ee306… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":5.1,"baseSeverity":"MEDIUM","privilegesRequired":"HIGH","subAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:e5580270250705a8a9b4554f46dedc438bd12cca3c835438dd25f46ebfaaaf52 · sha256:083d1915325ee306… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"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:e5580270250705a8a9b4554f46dedc438bd12cca3c835438dd25f46ebfaaaf52 · sha256:083d1915325ee306… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/sveltejs/svelte/security/advisories/GHSA-m56q-vw4c-c2cp","tags":["x_refsource_CONFIRM"],"url":"https://github.com/sveltejs/svelte/security/advisories/GHSA-m56q-vw4c-c2cp"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e5580270250705a8a9b4554f46dedc438bd12cca3c835438dd25f46ebfaaaf52 · sha256:083d1915325ee306… · /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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