Is CVE-2026-27902 actively exploited?

No active exploitation of CVE-2026-27902 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-27902 be exploited remotely?

Yes. CVE-2026-27902 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-27902?

CVE-2026-27902 has a CVSS score of 5.3 (MEDIUM) and an EPSS exploitation probability of 0.04%.

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MEDIUM

CVE-2026-27902

CWE-79Published: February 26, 2026· Updated: Feb 27, 2026

5.3

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:13.5th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-27902 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (P) is needed, which slightly reduces the risk of mass automated attacks.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges Req.None

User InteractionP

ScopeX

Impact

Confidentiality

Integrity

Availability

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X