What is the CVSS score of CVE-2026-27375?

CVE-2026-27375 has a CVSS 3.1 base score of 7.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L. EPSS exploitation probability: 0.0%.

Which versions of JanStudio Gecko are affected by CVE-2026-27375?

JanStudio Gecko versions 1.9.8 and earlier contain a reflected cross-site scripting (XSS) vulnerability that could allow attackers to steal user sessions, credentials, or sensitive data from affected…

How to fix or mitigate CVE-2026-27375?

Within 24 hours: Identify all systems running Gecko and assess user-facing exposure; notify stakeholders of the vulnerability. Within 7 days: Implement WAF rules to block malicious XSS payloads, disable Gecko if not business-critical, or restrict access to authenticated users only. Within 30 days: Evaluate alternative solutions or commit to a vendor roadmap for patching; establish compensating controls as interim measures until patch availability.

JanStudio Gecko CVE-2026-27375

HIGH

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

2026-03-05 audit@patchstack.com

XSS

7.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.1 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

Low

Lifecycle Timeline

Re-analysis Queued

Apr 22, 2026 - 21:37 vuln.today

cvss_changed

Analysis Generated

Mar 12, 2026 - 22:06 vuln.today

CVE Published

Mar 05, 2026 - 06:16 nvd

HIGH 7.1

DescriptionCVE.org

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in JanStudio Gecko gecko allows Reflected XSS.This issue affects Gecko: from n/a through <= 1.9.8.

AnalysisAI

JanStudio Gecko version 1.9.8 and earlier contain a reflected cross-site scripting (XSS) vulnerability that allows unauthenticated remote attackers to inject malicious scripts through improper input validation during web page generation. Successful exploitation requires user interaction and can lead to unauthorized access to sensitive information, data modification, or service disruption. No patch is currently available.

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects JanStudio Gecko gecko. Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in JanStudio Gecko gecko allows Reflected XSS.This issue affects Gecko: from n/a through <= 1.9.8.

Affected ProductsAI

Product: JanStudio Gecko gecko.

RemediationAI

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.