Stored XSS via unchecked Markdown reference URLs
Published Jun 17, 2026 · Updated Jun 17, 2026
Stored XSS in Shaarli 0.16.1 and earlier allows attackers to execute JavaScript when another user clicks a crafted link. BookmarkMarkdownFormatter.php's filterProtocols method checks only inline Markdown links before parsing, so reference definitions carrying javascript: URLs bypass inspection. The attacker must log in and save a malicious bookmark description, and a victim must click the rendered link; successful exploitation runs script in the victim's Shaarli session.
Summary
What happened
Stored XSS in Shaarli 0.16.1 and earlier allows attackers to execute JavaScript when another user clicks a crafted link. BookmarkMarkdownFormatter.php's filterProtocols method checks only inline Markdown links before parsing, so reference definitions carrying javascript: URLs bypass inspection. The attacker must log in and save a malicious bookmark description, and a victim must click the rendered link; successful exploitation runs script in the victim's Shaarli session.
The record
- CVE
- CVE-2026-48822
- Published
- Jun 17, 2026
- Updated
- Jun 17, 2026
- Vendor
- Shaarli
- Product
- Shaarli
- Classifications
- CWE-79, T1204.001
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 17, 2026CVE publishedPublication date reported by the CVE source.
- Jun 17, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 0.16.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Upstream Markdown reference-link XSS proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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