CVE-2026-33559Network attack vector

Browser script execution via crafted page content

Published Mar 27, 2026 · Updated Mar 27, 2026

Stored cross-site scripting in MiKa OSM – OpenStreetMap before 6.1.15 allows remote authenticated users to run script in browsers via crafted requests. Neither JPCERT/CC nor MiKa has published the affected parameter, handler, or missing output-encoding operation behind the stored payload. Page-creation or editing privileges are required to store the payload, and a victim must open the affected page for browser execution.

CVSS severity5.4
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in MiKa OSM – OpenStreetMap before 6.1.15 allows remote authenticated users to run script in browsers via crafted requests. Neither JPCERT/CC nor MiKa has published the affected parameter, handler, or missing output-encoding operation behind the stored payload. Page-creation or editing privileges are required to store the payload, and a victim must open the affected page for browser execution.

The record

CVE
CVE-2026-33559
Published
Mar 27, 2026
Updated
Mar 27, 2026
Vendor
OpenStreetMap
Product
OSM – OpenStreetMap
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=prior to 6.1.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenStreetMap · OSM – OpenStreetMapversion=prior to 6.1.15

Published CVSS scores

5.4JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.1JPCERT/CCCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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