What is the CVSS score of CVE-2026-27169?

CVE-2026-27169 has a CVSS 3.1 base score of 8.9 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-27169?

Within 24 hours: Inventory all OpenShift deployments and document version numbers; restrict chat feature access to trusted internal networks only. Within 7 days: Isolate or air-gap OpenShift instances handling sensitive data; escalate to vendor for patch timeline and interim security guidance. Within 30 days: Upgrade to patched version when available; conduct security audit of any chat interactions during vulnerable period for signs of exploitation.

Opensift CVE-2026-27169

HIGH

Cross-site Scripting (XSS) (CWE-79)

2026-02-21 security-advisories@github.com

XSS AI / ML Opensift

8.9

CVSS 3.1 · GitHub Advisory

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Create malicious study/quiz content with embedded script tags
Delivery

Store content in OpenSift database
Exploit

Victim views content in chat UI
Execution

JavaScript executes in authenticated session
Impact

Attacker performs unauthorized actions

Vulnerability Assessment

Weakness	CWE CWE-79 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization Output encoding, context-aware escaping MITRE ATT&CK 2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Attacker must have OpenSift account with create/edit permissions for study materials, quiz content, or flashcards. Victim must be authenticated and view the poisoned content in the chat tool interface. Affects OpenSift versions 1.1.2-alpha and below with unsafe HTML rendering in UI.
Impact	CVSS 8.9 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: Required. Exploitation requires authentication. Exploitable via local access.
Exploit ScenarioDerived	An attacker (requires authentication) could exploit this vulnerability to compromise the affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Stored cross-site scripting in OpenSift versions 1.1.2-alpha and below allows authenticated attackers to execute arbitrary JavaScript in victims' browsers by injecting malicious content into study materials, quizzes, or flashcards that render without proper HTML sanitization. An attacker with the ability to create or modify stored content could perform unauthorized actions within authenticated user sessions. No patch is currently available for this vulnerability.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:04 CVSS 8.9

RemediationAI

Fixed in version 1.1.3. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Opensift. OpenSift is an AI study tool that sifts through large datasets using semantic search and generative AI. Versions 1.1.2-alpha and below render untrusted user/model content in chat tool UI surfaces using unsafe HTML interpolation patterns, leading to XSS. Stored content can execute JavaScript when later viewed in authenticated sessions. An attacker who can influence stored study/quiz/flashcard content could trigger script execution in a victim’s browser, potentially performing actions as that user

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

GitHub Advisory PRIMARY 8.9 HIGH

AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

Low

DescriptionGitHub Advisory

OpenSift is an AI study tool that sifts through large datasets using semantic search and generative AI. Versions 1.1.2-alpha and below render untrusted user/model content in chat tool UI surfaces using unsafe HTML interpolation patterns, leading to XSS. Stored content can execute JavaScript when later viewed in authenticated sessions. An attacker who can influence stored study/quiz/flashcard content could trigger script execution in a victim’s browser, potentially performing actions as that user in the local app session. This issue has been fixed in version 1.1.3-alpha.

Executive ViewAI

Why It Matters

OpenShift versions 1.1.2-alpha and below contain a critical cross-site scripting (XSS) vulnerability that allows attackers to inject malicious code through the chat interface, potentially compromising user sessions and data. Organizations using this AI study tool for sensitive research or institutional data face immediate risk of unauthorized access, data theft, and reputational damage.

Business Impact: High

Compensating Controls

Deploy Web Application Firewall (WAF) rules to block HTML/script injection payloads in chat input fields; implement strict Content Security Policy (CSP) headers to prevent inline script execution; disable or restrict chat feature access to authenticated internal users only; segment OpenShift instances from internet-facing infrastructure; enable comprehensive logging/monitoring of chat interactions for IOC detection; consider temporary alternative tools for critical AI-driven research workflows.

Threat Intelligence Overview

EPSS Score

0.0%

Top 85% exploitable

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.0%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.