5.3

CVE-2026-56761: hono Cross-site Scripting

CVSS: 5.3v4.0MediumAnalyzed
AliasesCGA-hfvf-7gpw-pq8pCGA-ppfh-mf8w-pxfcGHSA-458j-xx4x-4375
Published 24-06-2026Last modified 24-06-2026
Open JSON

Vulnerability summary

CVE-2026-56761 is a medium (CVSS 5.3) Cross-site Scripting vulnerability in hono. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 20.7% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.29%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-6CRF-CGJ2-8HQ7

Timeline

  1. 24-06-2026
    PublishedVulnerability first disclosed.
  2. 24-06-2026
    Last modifiedVulnerability information updated.

Description

hono before 4.12.14 contains an html injection vulnerability in jsx server-side rendering that allows attackers to inject unintended html by using malformed attribute names. Attackers can craft specially crafted attribute keys containing characters like quotes or angle brackets to break html tag boundaries and inject arbitrary attributes or elements.

CVSS metrics

7 scores · 5 sources · 2 versions

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

21%

Versus all other CVEs

30-day change

0.00 pp

From 0.29% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.29%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard23 products
  • commercial-gitlab-rails-ee-19.1< 19.1.7-r3
  • commercial-gitlab-rails-ee-19.2< 19.2.7-r1
  • commercial-gitlab-rails-ee-19.3< 19.3.3-r1
  • commercial-gitlab-rails-ee-19.4< 19.4.1-r1
  • commercial-gitlab-rails-ee-fips-19.1All versions (No fix recorded) | < 19.1.9-r0
Hono1 product
Npm1 product
  • hono< 4.12.14
Wolfi1 product
  • langfuse-3-worker< 3.164.0-r5

4 vendors · 26 products

References

5 links