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  4. CVE 2026 118652 echo reflected cross site scripting xss via
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Back to active CVEs
Medium · CVSS 6.1CVE-2026-118652GHSA-H9G5-28MM-HX3G

Echo: Reflected Cross-Site Scripting (XSS) via unsanitized JSONP callback in Context.JSONP / Context.JSONPBlobCVE-2026-118652

Answer in brief

CVE-2026-118652 records a Medium severity (CVSS 6.1) vulnerability in Echo: Reflected Cross-Site Scripting (XSS) via unsanitized JSONP callback in Context.JSONP / Context.JSONPBlob. The current sources do not mark it as known exploited. The current feed maps labstack/echo (generic), github.com/labstack/echo/v4 (go), github.com/labstack/echo/v5 (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 28, 2026Updated Oct 28, 2026Source checked Oct 28, 2026First seen by HOL Oct 28, 2026Material review Oct 28, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.1
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps labstack/echo (generic), github.com/labstack/echo/v4 (go), github.com/labstack/echo/v5 (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
labstack/echogeneric<4.16.0 || >=5.0.0 <5.4.04.16.0, 5.4.0
github.com/labstack/echo/v4go<4.16.04.16.0
github.com/labstack/echo/v5go<5.4.05.4.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for labstack/echo, github.com/labstack/echo/v4, github.com/labstack/echo/v5.
  2. 2Review the reported fix. Update labstack/echo to 4.16.0; github.com/labstack/echo/v4 to 4.16.0; github.com/labstack/echo/v5 to 5.4.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 28, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 28, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 28, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, Context.JSONP and Context.JSONPBlob concatenate an unvalidated callback value into a JavaScript response. A route that passes attacker-controlled input as the callback can return executable script syntax, allowing reflected cross-site scripting when a user loads the crafted response. The vulnerable jsonPBlob path performs no callback validation or escaping, and exploitation requires an application route that exposes attacker control over the callback argument. This issue is fixed in 4.16.0 and 5.4.0.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Echo: WebSocket proxy can retain connections and handlers after client disconnectSame labstack/echo package
  • Echo: BodyDump can discard BodyLimit overflow errors for unknown-length requestsSame labstack/echo package
  • Echo: Rejected WebSocket upgrades can bypass Echo route-level access controlsSame labstack/echo package
  • Echo: X-Real-IP extractor trusts the header value instead of the sending peerSame labstack/echo package
  • Echo: CSRF Protection Bypass via MethodOverride Rewriting POST to Safe MethodSame labstack/echo package
  • Echo: middleware.Static: `%2F`-encoded path bypasses route/group middleware guarding a statically-served pathSame labstack/echo package

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Oct 28, 2026
References
6 linked sources
Open source record