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Movary CVE-2026-23840

CRITICAL
Improper Input Validation (CWE-20)
2026-01-19 security-advisories@github.com
XSS Movary
9.3
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
9.3 CRITICAL
AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

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

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
PoC Detected
Feb 03, 2026 - 14:47 vuln.today
Public exploit code
CVE Published
Jan 19, 2026 - 19:16 nvd
CRITICAL 9.3

DescriptionGitHub Advisory

Movary is a web application to track, rate and explore your movie watch history. Due to insufficient input validation, attackers can trigger cross-site scripting payloads in versions prior to 0.70.0. The vulnerable parameter is ?categoryDeleted=. Version 0.70.0 fixes the issue.

AnalysisAI

Movary has a second input validation vulnerability allowing authenticated users to write arbitrary files on the server, enabling code execution through web shell upload.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malicious URL with XSS payload in categoryDeleted parameter
Delivery
Send link to Movary user
Exploit
User clicks link in browser
Execution
JavaScript executes in user session context
Impact
Attacker steals session cookies or performs unauthorized actions
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Vulnerability AssessmentAI

Exploitation Movary versions prior to 0.70.0 with the categoryDeleted URL parameter accepting unvalidated user input. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 9.3 with PoC. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated attacker exploits the file write vulnerability to place a PHP web shell in the web root, then accesses it to execute arbitrary commands on the server.
Remediation Update Movary. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all affected systems running versions and apply vendor patches immediately. …

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CVE-2026-23840 vulnerability details – vuln.today
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