cve.bz

CVE-2026-27902

5.3 mediumEPSS 0.3%

Medium (5.3) in svelte svelte. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in svelte 5.53.5.

Svelte performance oriented web framework. Prior to version 5.53.5, errors from `transformError` were not correctly escaped prior to being embedded in the HTML output, causing potential HTML injection and XSS if attacker-controlled content is returned from `transformError`. Version 5.53.5 fixes the issue.

Severity

CVSS 4.0

5.3 medium
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N

CVSS 3.1

5.4 medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
EPSS
0.3% chance of exploitation in the next 30 days; higher than 19% of CVEs (scores of 2026-10-31)
CWE
CWE-79
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-qgvg-pr8v-6rr3npmsvelte>=5.53.0 <5.53.55.53.5

References

Check your stackJSON