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LimeSurvey CVE-2026-63360

| EUVDEUVD-2026-66773 HIGH
Cross-site Scripting (XSS) (CWE-79)
2026-08-26 Fluid Attacks GHSA-65x5-6vw6-2f55
7.4
CVSS 4.0 · Vendor: Fluid Attacks
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Severity by source

Vendor (Fluid Attacks) PRIMARY
7.4 HIGH
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
6.1 MEDIUM

Reflected XSS requires victim user interaction and scope change to browser context; attacker needs no privileges and there is no availability impact.

3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (Fluid Attacks).

CVSS VectorVendor: Fluid Attacks

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
A
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 26, 2026 - 22:23 vuln.today
CVE Published
Aug 26, 2026 - 21:47 cve.org
HIGH 7.4

DescriptionCVE.org

LimeSurvey Community Edition 7.0.5+260623 contains an authenticated reflected Cross-Site Scripting vulnerability in the user activation confirmation endpoint. The action query parameter is copied into the response and inserted into a hidden input attribute without HTML attribute encoding.

This issue affects LimeSurvey: 7.0.5.

AnalysisAI

Reflected Cross-Site Scripting in LimeSurvey Community Edition 7.0.5+260623 allows a remote unauthenticated attacker to execute arbitrary JavaScript in the browser of an authenticated user by crafting a malicious URL targeting the user activation confirmation endpoint. The action query parameter is inserted unsanitized into a hidden HTML input attribute, enabling attribute context breakout and script injection. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
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Delivery
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Exploit
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Install
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C2
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Execute
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Impact
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Vulnerability AssessmentAI

Exploitation The victim must be authenticated to LimeSurvey at the time they visit the crafted URL - the payload executes in the context of their active session, which is what makes session theft the primary impact. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 7.4 (AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N) captures the combination of network exploitability and high vulnerable-system impact, offset by mandatory user interaction and the AT:P prerequisite. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation No exact patched version is confirmed in the available data; organizations should monitor the LimeSurvey GitHub repository at https://github.com/LimeSurvey/LimeSurvey and the Fluid Attacks advisory at https://fluidattacks.com/advisories/raine for a confirmed fix release and upgrade immediately upon availability. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify all LimeSurvey 7.0.5+ deployments and issue urgent user communication advising against clicking suspicious links from untrusted sources; implement Web Application Firewall rules to block malicious action parameter values and deploy restrictive Content Security Policy headers. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-63360 vulnerability details – vuln.today

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