CVE-2015-9545

Local-storage read and write via unchecked origins

Published Apr 7, 2020 · Updated Aug 6, 2024

Improper origin validation in xdLocalStorage 2.0.5 and earlier allows remote attackers to read or write site local-storage data. The receiveMessage() handler in xdLocalStorage.js accepts cross-window messages without checking event.origin against an allowed origin before processing storage operations. Exploitation requires a user to load an attacker-controlled site that sends crafted messages, exposing only the vulnerable site’s local-storage confidentiality and integrity.

CVSS severity7.1
High
EPSS probability1.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper origin validation in xdLocalStorage 2.0.5 and earlier allows remote attackers to read or write site local-storage data. The receiveMessage() handler in xdLocalStorage.js accepts cross-window messages without checking event.origin against an allowed origin before processing storage operations. Exploitation requires a user to load an attacker-controlled site that sends crafted messages, exposing only the vulnerable site’s local-storage confidentiality and integrity.

The record

CVE
CVE-2015-9545
Published
Apr 7, 2020
Updated
Aug 6, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-20, T1204
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.1GitHub Advisory DatabaseCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1204User 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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