CVE-2023-28828Network attack vector

Server file disclosure via external entity expansion

Published Apr 11, 2023 · Updated Feb 7, 2025

XML external entity injection in Siemens Polarion ALM before V22R2 allows remote attackers to read files from the application server filesystem. The OpenSAML 4.x parser configuration expands entity references and permits external entities and document type declarations in attacker-supplied XML. Unauthenticated network access and crafted XML are required; exploitation discloses readable server files without reported modification or service interruption.

CVSS severity5.9
Medium
EPSS probability0.59%
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 Siemens Polarion ALM before V22R2 allows remote attackers to read files from the application server filesystem. The OpenSAML 4.x parser configuration expands entity references and permits external entities and document type declarations in attacker-supplied XML. Unauthenticated network access and crafted XML are required; exploitation discloses readable server files without reported modification or service interruption.

The record

CVE
CVE-2023-28828
Published
Apr 11, 2023
Updated
Feb 7, 2025
Vendor
Siemens
Product
Polarion ALM
Classifications
CWE-611, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 7, 2025Record 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=All versions < V22R2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · Polarion ALMversion=All versions < V22R2

Published CVSS scores

7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.9Siemens AGCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-611Improper Restriction of XML External Entity Reference
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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