CVE-2013-4335Network attack vector

Unauthenticated data disclosure via XML external entities

Published Feb 7, 2020 · Updated Aug 6, 2024

XML external entity injection in OpenPNE Project opOpenSocialPlugin 0.8.2.1, 0.9.9.2, 0.9.13, and 1.2.6 allows remote attackers to read data. Multiple plugin XML parsing paths accept attacker-controlled DTD entity declarations without preventing external entity resolution. No authentication is required; resolved entities can disclose or modify data or interrupt the OpenPNE service.

CVSS severity9.8
Critical
EPSS probability2.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XML external entity injection in OpenPNE Project opOpenSocialPlugin 0.8.2.1, 0.9.9.2, 0.9.13, and 1.2.6 allows remote attackers to read data. Multiple plugin XML parsing paths accept attacker-controlled DTD entity declarations without preventing external entity resolution. No authentication is required; resolved entities can disclose or modify data or interrupt the OpenPNE service.

The record

CVE
CVE-2013-4335
Published
Feb 7, 2020
Updated
Aug 6, 2024
Vendor
OpenPNE Project
Product
opOpenSocialPlugin
Classifications
CWE-776, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 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?

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

  1. Affected versionversion=0.8.2.1
  2. Affected versionversion=0.9.13
  3. Affected versionversion=0.9.13.1
  4. Affected versionversion=> 0.9.9.2
  5. Affected versionversion=0.9.9.3
  6. Affected versionversion=1.2.6.1)
  7. Affected versionversion=1.2.6 (Fixed: 0.8.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenPNE Project · opOpenSocialPluginversion=0.8.2.1; version=0.9.13; version=0.9.13.1; version=> 0.9.9.2; version=0.9.9.3; version=1.2.6.1); version=1.2.6 (Fixed: 0.8.2.2

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-776Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
T1190Exploit Public-Facing Application

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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