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Full vulnerability report · 2018
CVE-2018-8252High confidence

Microsoft Microsoft SharePoint: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Microsoft · Microsoft SharePoint

5.4MediumCVSS 3.0
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
Optional official sources

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

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2018-19918

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

An elevation of privilege vulnerability exists when Microsoft SharePoint Server does not properly sanitize a specially crafted web request to an affected SharePoint server, aka "Microsoft SharePoint Elevation of Privilege Vulnerability." This affects Microsoft SharePoint. This CVE ID is unique from CVE-2018-8254.

What

An elevation of privilege vulnerability exists when Microsoft SharePoint Server does not properly sanitize a specially crafted web request to an affected SharePoint server, aka "Microsoft SharePoint Elevation of Privilege Vulnerability." This affects Microsoft SharePoint. This CVE ID is unique from CVE-2018-8254.

Why

Attacker-controlled content can reach a browser as executable script without sufficient output encoding or sanitisation.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may gain additional privileges.

What

An elevation of privilege vulnerability exists when Microsoft SharePoint Server does not properly sanitize a specially crafted web request to an affected SharePoint server, aka "Microsoft SharePoint Elevation of Privilege Vulnerability." This affects Microsoft SharePoint. This CVE ID is unique from CVE-2018-8254.

Why

Attacker-controlled content can reach a browser as executable script without sufficient output encoding or sanitisation.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may gain additional privileges.

02

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.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') → gain additional privileges
Attack surface
Network
Privileges required
Low: a basic authenticated account is required
User interaction
Required interaction required
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Changed: exploitation can affect a different security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-79 ↗

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Common Vulnerability Scoring System 3.0: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SChangedScope: The attack can affect a component governed by a different security authority.CLowConfidentiality impact: A successful attack can cause a limited loss.ILowIntegrity impact: A successful attack can cause a limited loss.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkPrivilege escalationCWE-79
A

Official authority intelligence

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

Canadian Centre for Cyber Security · English · AV18-095Microsoft security updates

036, CVE-2018-1040, CVE-2018-8110, CVE-2018-8111, CVE-2018-8113, CVE-2018-8121, CVE-2018-8140, CVE-2018-8169, CVE-2018-8175, CVE-2018-8201, CVE-2018-8205, CVE-2018-8207, CVE-2018-8208, CVE-2018-8209, CVE-2018-8210, CVE-2018-8211, CVE-2018-8212, CVE-2018-8213, CVE-2018-8214, CVE-2018-8215, CVE-2018-8216, CVE-2018-8217, CVE-2018-8218, CVE-2018-8219, CVE-2018-8221, CVE-2018-8224, CVE-2018-8225, CVE-2018-8226, CVE-2018-8227, CVE-2018-8229, CVE-2018-8231, CVE-2018-8233, CVE-2018-8234, CVE-2018-8235, CVE-2018-8236, CVE-2018-8239, CVE-2018-8243, CVE-2018-8244, CVE-2018-8245, CVE-2018-8246, CVE-2018-8247, CVE-2018-8248, CVE-2018-8249, CVE-2018-8251, CVE-2018-8252, CVE-2018-8254, CVE-2018-8267 Suggested Action CCIRC recommends that system administrators test and deploy the vendor-released updates to affected applications accordingly. References: https://portal.msrc.microsoft.com/en-us/security-guidance https://docs.microsoft.com/en-us/security-updates/securityadvisories/2018/4338110

Official advisory ↗
CERT-FR · French · CERTFR-2018-AVI-285Multiples vulnérabilités dans Microsoft Office

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

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2018-006184Microsoft Project Server および SharePoint における権限を昇格される脆弱性

Microsoft Project Server および SharePoint には、巧妙に細工された Web リクエストを適切にサニタイズしない場合、権限を昇格される脆弱性が存在します。 ベンダは、本脆弱性を「Microsoft SharePoint の特権の昇格の脆弱性」として公開しています。 本脆弱性は、CVE-2018-8252 とは異なる脆弱性です。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2018-006183Microsoft SharePoint における権限を昇格される脆弱性

Microsoft SharePoint には、巧妙に細工された Web リクエストを適切にサニタイズしない場合、権限を昇格される脆弱性が存在します。 ベンダは、本脆弱性を「Microsoft SharePoint の特権の昇格の脆弱性」として公開しています。 本脆弱性は、CVE-2018-8254 とは異なる脆弱性です。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-4891MS 6월 보안 위협에 따른 정기 보안 업데이트 권고

o 이용자가 특수하게 제작된 악성 문서를 열람할 경우, 원격코드실행을 허용하는 취약점 o 관련취약점 : - 원격코드실행 취약점(CVE-2018-8176,CVE-2018-8248) - 권한상승 취약점(CVE-2018-8244,CVE-2018-8245,CVE-2018-8247) - 정보노출 취약점(CVE-2018-8246) o 영향 : 원격코드실행 o 중요도 : 중요 o 관련 KB번호 - 3115197, 3115248, 4011026, 4011186, 4018387, 4022151, 4022160, 4022169, 4022173, 4022174, 4022177, 4022179, 4022182, 4022183, 4022190, 4022191, 4022196, 4022197, 4022199, 4022203, 4022205, 4022209, 4022210 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 10. SharePoint Server, SharePoint Enterprise Server, Project Server 보안 업데이트 ##### □ 설명 o 공격자가 프로그램 버그(실행 처리 구문의 허점 등)을 악용하여 보호되는 자원들에 임의로 접근하는 권한상승 취약점 o 관련취약점 : - 권한상승 취약점(CVE-2018-8252,CVE-2018-8254) o 영향 : 권한상승 o 중요도 : 중요 o 관련 KB번호 - 4022190, 4022173, 4022210 ##### □ 해결책 o 영향 받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용

Official advisory ↗
03

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
Microsoft SharePoint: Enterprise Server 2016, Foundation 2013 Service Pack 1
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. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 14 Jun 2018 · Last source change 5 Aug 2024, 06:46 UTC · CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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-2018-19918
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. Vendor guidanceAuthoritative vendor guidance changed from no authoritative guidance recorded to authoritative remediation link · patch.
    Before
    no authoritative guidance recorded
    After
    authoritative remediation link · patch
    af854a3a-2127-422b-91ae-364da2661108 ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    Enterprise Server 2016; Foundation 2013 Service Pack 1 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    Enterprise Server 2016; Foundation 2013 Service Pack 1 · 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 ↗
  3. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    af854a3a-2127-422b-91ae-364da2661108 ↗
  4. SeveritySeverity changed from Unknown to Medium.
    Before
    Unknown
    After
    Medium
    NIST NVD ↗
  5. CVSS scoreCVSS score changed from not recorded to 5.4 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N).
    Before
    not recorded
    After
    5.4 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N)
    NIST NVD ↗
  6. ENISA EUVD mappingEUVD-2018-19918 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2018-19918"}
    ENISA EUVD ↗
  7. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2018-19918↗Patch or update reference↗CVE authority or vendor 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.
Free version - for non-commercial use only.CVE-2018-8252 · cve.blacktree.nl