Stored XSS via unescaped shortcode attributes
Published Aug 10, 2026 · Updated Aug 10, 2026
Stored XSS in WebSharks s2Member before 260805 allows remote authenticated users with Contributor access to run JavaScript in viewers' browsers. The s2Stream shortcode writes player_title, player_description, player_tracks, and player_option_blocks into a single-quoted inline player script without context-appropriate escaping; base64-decoded values also reach that context unfiltered. Exploitation requires multisite or DISALLOW_UNFILTERED_HTML, an active plugin, a reachable JW Player library, Editor publication, and a viewer opening the post.
Summary
What happened
Stored XSS in WebSharks s2Member before 260805 allows remote authenticated users with Contributor access to run JavaScript in viewers' browsers. The s2Stream shortcode writes player_title, player_description, player_tracks, and player_option_blocks into a single-quoted inline player script without context-appropriate escaping; base64-decoded values also reach that context unfiltered. Exploitation requires multisite or DISALLOW_UNFILTERED_HTML, an active plugin, a reachable JW Player library, Editor publication, and a viewer opening the post.
The record
- CVE
- CVE-2026-15047
- Published
- Aug 10, 2026
- Updated
- Aug 10, 2026
- Vendor
- Cristián Lávaque
- Product
- s2Member
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 10, 2026CVE publishedPublication date reported by the CVE source.
- Aug 10, 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 <260805
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
- WPScan s2Stream shortcode stored XSS proof of conceptfunctional · validated
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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