CVE-2018-8527: Microsoft SQL Server Management Studio 17.9: Improper Restriction of XML External Entity Reference

Recommended actionWithin 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available

What, why and how

An information disclosure vulnerability exists in Microsoft SQL Server Management Studio (SSMS) when parsing a malicious XEL file containing a reference to an external entity, aka "SQL Server Management Studio Information Disclosure Vulnerability." This affects SQL Server Management Studio 17.9, SQL Server Management Studio 18.0. This CVE ID is unique from CVE-2018-8532, CVE-2018-8533.

What

Why

The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

How

An attacker operating through local access may attempt exploitation without authentication after a user interaction. If successful, the issue may obtain information outside the intended access boundary.

What

Why

How

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation

Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.

No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material

Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.

Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path: local access → Improper Restriction of XML External Entity Reference → obtain information outside the intended access boundary
Attack surface: Local
Privileges required: None: unauthenticated exploitation is possible
User interaction: Required interaction required
Attack complexity: Low: no specialised conditions are recorded
Security boundary: Unchanged: impact remains within the vulnerable component's security authority
Weakness ? CWE means Common Weakness Enumeration: a standard category for the underlying weakness.: CWE-611 ↗
CWE-611: Improper Restriction of XML External Entity Reference. The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.
CVSS vector ? CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Common Vulnerability Scoring System 3.0: the compact vector below is decoded into plain language.
AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.INoneIntegrity impact: No direct loss is represented by this metric.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land: The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.

UnauthenticatedCWE-611Public exploit reference

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2018-20151Official EUVD mapping

0 linked advisory records.

Official EUVD record ↗

CERT-FR · French · CERTFR-2018-AVI-486Multiples vulnérabilités dans les produits Microsoft

De multiples vulnérabilités ont été corrigées dans les produits Microsoft . Elles permettent à un attaquant de provoquer une élévation de privilèges, une atteinte à la confidentialité des données et une exécution de code à distance.

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2018-009784Microsoft SQL Server Management Studio における情報を公開される脆弱性

MicrosoftSQL Server Management Studio (SSMS) には、外部エンティティへの参照を含む悪質な XML コンテンツを解析する場合、情報を公開される脆弱性が存在します。ベンダは、本脆弱性を「SQL Server Management Studio の情報漏えいの脆弱性」として公開しています。本脆弱性は、CVE-2018-8527 および CVE-2018-8532 とは異なる脆弱性です。

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2018-009783Microsoft SQL Server Management Studio における情報を公開される脆弱性

MicrosoftSQL Server Management Studio (SSMS) には、外部エンティティへの参照を含む悪質な XMLA ファイルを解析する場合、情報を公開される脆弱性が存在します。ベンダは、本脆弱性を「SQL Server Management Studio の情報漏えいの脆弱性」として公開しています。本脆弱性は、CVE-2018-8527 および CVE-2018-8533 とは異なる脆弱性です。

Official advisory ↗

JVN iPedia · Japanese · JVNDB-2018-009782Microsoft SQL Server Management Studio における情報を公開される脆弱性

MicrosoftSQL Server Management Studio (SSMS) には、外部エンティティへの参照を含む悪質な XEL ファイルを解析する場合、情報を公開される脆弱性が存在します。ベンダは、本脆弱性を「SQL Server Management Studio の情報漏えいの脆弱性」として公開しています。本脆弱性は、CVE-2018-8532 および CVE-2018-8533 とは異なる脆弱性です。

Official advisory ↗

KISA KrCERT/CC · Korean · KNVD-4924MS 10월 보안 위협에 따른 정기 보안 업데이트 권고

439, 4092444, 4092464, 4092482, 4092453, 4461445, 4461437, 4092483, 4461434, 4022138, 4461466, 4461448, 4461460, 4227167, 4092483, 4092437 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 10. SharePoint Server, SharePoint Enterprise Server 보안 업데이트 ##### □ 설명 o 이용자가 특수하게 제작된 악성 문서를 열람할 경우, 원격코드실행을 허용하는 취약점 o 관련취약점 : - 원격코드실행 취약점(CVE-2018-8504) - 권한상승 취약점(CVE-2018-8480,CVE-2018-8488,CVE-2018-8498,CVE-2018-8518) o 영향 : 원격코드실행 o 중요도 : 중요 o 관련 KB번호 - 4461447, 4461450, 4092481 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 11. SQL Server 보안 업데이트 ##### □ 설명 o 공격자가 프로그램의 미흡한 설계(적절한 검증 부재)를 악용하여 제한된 자원에 접근가능한 정보노출 취약점 o 관련취약점 : - 정보노출 취약점(CVE-2018-8527,CVE-2018-8532,CVE-2018-8533) o 영향 : 정보노출 o 중요도 : 중요 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 12. Exchange Server 보안 업데이트 ##### □ 설명 o 공격자가 특수하게 제작된 악성 응용 프로그램을 실행할 경우, 원격코드실행을 허용하는 취약점 o 관련취약점 : - 원격코드실행 취약점(CVE-2010-3190,CVE-2018-8265) - 권한상승 취약점(CVE-2018-8448) o 영향 : 원격코드실행 o 중요도 : 중요 o 관련 KB번호 - 2565063, 4459266 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 13. .NET Core 보안 업데이트 ##### □ 설명 o 공격자가 프로그램의 미흡한 설계(적절한 검증 부재)를 악용하여 제한된 자원에 접근가능한 정보노출 취약점 o 관련취약점 : - 정보노출 취약점(CVE-2018-8292) o 영향 : 정보노출 o 중요도 : 중요 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용

Official advisory ↗

Patch and workaround

Operational remediation based on structured source evidence.

Status ? Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.: Patch available
Affected: SQL Server Management Studio 17.9: SQL Server Management Studio 17.9
SQL Server Management Studio 18.0: (Preview 4)
Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action: Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround: No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.

Evidence and provenance

Published 10 Oct 2018 · Last source change 5 Aug 2024, 07:02 UTC · CWE-611 · Improper Restriction of XML External Entity Reference

CVE recordCVE.org · 5.1

CVSS sourceNIST NVD

EPSS source

The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.

FIRST · tracked since 2026-09-01

European sourceENISA EUVD · EUVD-2018-20151

Product sourceCNA

Remediation sourceCVE/CNA references

CWE sourceNIST NVD

NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗

1 Sep 2026, 02:42 UTC
ENISA EUVD mappingEUVD-2018-20151 was added to the official ENISA EUVD mapping for this CVE.
Before
not recorded
After
{"euvdId":"EUVD-2018-20151"}
ENISA EUVD ↗
5 Aug 2024, 07:02 UTC
Vendor guidanceAuthoritative vendor guidance changed: added patch: portal.msrc.microsoft.com/CVE-2018-8527; added remediation: portal.msrc.microsoft.com/CVE-2018-8527.
Before
no authoritative guidance recorded
After
patch: portal.msrc.microsoft.com/CVE-2018-8527 · remediation: portal.msrc.microsoft.com/CVE-2018-8527
portal.msrc.microsoft.com ↗
5 Aug 2024, 07:02 UTC
Affected versionsThe structured affected or fixed version information changed.
Before
SQL Server Management Studio 17.9; (Preview 4) · Fixed: No fixed version is explicitly recorded in the structured CVE data.
After
SQL Server Management Studio 17.9; (Preview 4) · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
CNA ↗
5 Aug 2024, 07:02 UTC
Remediation statusRemediation status changed from Awaiting fix to Patch available.
Before
Awaiting fix
After
Patch available
portal.msrc.microsoft.com ↗
5 Aug 2024, 07:02 UTC
SeveritySeverity changed from Unknown to Medium.
Before
Unknown
After
Medium
NIST NVD ↗
5 Aug 2024, 07:02 UTC
CVSS scoreCVSS score changed from not recorded to 5.5 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N).
Before
not recorded
After
5.5 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N)
NIST NVD ↗
5 Aug 2024, 07:02 UTC
Catalogue recordCVE added to the BlackTree catalogue.
CNA ↗

2018-10-10CVE published

2024-08-05Fixed release or patch reference recorded

ENISA EUVD · EUVD-2018-20151↗CVE authority or vendor reference↗Public exploit reference↗Official CVE record (CNA and ADP data)↗NVD record↗

Technical terms and abbreviations used in this report

CVE: Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS: Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS: Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE: Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA: CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP: Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD: National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT: A computer security incident response team that publishes warnings or coordinates incident response.
PoC: Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF: Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL: Living off the land: abuse of legitimate tools or system functions during an attack.

Microsoft SQL Server Management Studio 17.9: Improper Restriction of XML External Entity Reference

Published severity in operational context

Evidence used

Compensating controls

Verification

National CERT insights
?
CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

ENISA European Vulnerability Database

EUVD-2018-20151

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

What changed after publication