Shaarli
CVE-2026-24476
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
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. |
| Impact | CVSS 5.4 (MEDIUM). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: Required. Public exploit/POC available. |
| Exploit ScenarioDerived | An attacker could exploit this vulnerability to add arbitrary html leading to a possible XSS attack. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Stored XSS in Shaarli versions before 0.16.0 allows authenticated attackers to inject malicious HTML by crafting tags starting with a double quote character, which breaks out of input tag validation on the homepage. An attacker with login credentials can exploit this to execute arbitrary JavaScript in victims' browsers with the victim's interaction. A patch is available in version 0.16.0 and public exploit code exists.
Earlier versions of this analysis (1)
Shaarli is a personal bookmarking service. Prior to version 0.16.0, crafting a malicious tag which starting with " prematurely ends the <input> tag on the start page and allows an attacker to add arbitrary html leading to a possible XSS attack. [CVSS 5.4 MEDIUM]
RemediationAI
A vendor patch is available — apply it immediately. 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 Shaarli. Shaarli is a personal bookmarking service. Prior to version 0.16.0, crafting a malicious tag which starting with " prematurely ends the <input> tag on the start page and allows an attacker to add arbitrary html leading to a possible XSS attack. Version 0.16.0 fixes the issue.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
3DescriptionGitHub Advisory
Shaarli is a personal bookmarking service. Prior to version 0.16.0, crafting a malicious tag which starting with " prematurely ends the <input> tag on the start page and allows an attacker to add arbitrary html leading to a possible XSS attack. Version 0.16.0 fixes the issue.
Executive ViewAI
Organizations using Shaarli should be aware of moderate risk from CVE-2026-24476, a cross-site scripting vulnerability rated CVSS 5.4. Attackers could inject scripts to steal sessions or perform actions as authenticated users. Proof-of-concept code is publicly available. A patch is available and should be applied during regular vulnerability management.
Apply vendor patch. If patching is delayed: implement CSP headers, enable HttpOnly cookies, deploy WAF XSS rules.
Threat Intelligence Overview
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.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
Affected Products (CPE)GitHub Advisory
Reflected Cross Site Scripting (XSS) vulnerability in Shaarli v0.12.2, allows remote attackers to execute arbitrary code
Stored XSS in Shaarli versions prior to 0.16.3 enables administrator account takeover through a low-effort social engine
Reflected XSS vulnerability in Shaarli v0.9.1 allows an unauthenticated attacker to inject JavaScript via the searchtags
Cross-site scripting (XSS) vulnerability in Shaarli before 0.8.5 and 0.9.x before 0.9.3 allows remote attackers to injec
DOM-based XSS in Shaarli's Thumbnail Synchronizer allows stored malicious bookmark titles to execute arbitrary JavaScrip
Stored XSS in Shaarli's Markdown rendering pipeline (versions 0.16.1 and prior) allows an authenticated user to inject m
Server-side request forgery (SSRF) in Shaarli up to 0.16.3 allows an attacker who can reach the admin-only MetadataContr
Stored XSS in Shaarli's tag filtering functionality permits an authenticated user to inject persistent JavaScript payloa
Exploit-DB