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GHSA-3jp5-3h47-28qf
mediawiki/semantic-media-wikiFailure mode
When headers=plain, table header text was emitted into <th> via a raw HTML path. User-controlled mainlabel content could therefore become executable HTML.
Remediation
TableResultPrinternow applies output-context escaping before passing plain headers to the table renderer.- The fix is limited to the HTML/plain-header branch so safe rendering modes are unaffected.
Why this is the right layer
The header value is not a structural token; it is display data. Sanitizing it at the sink is correct because the renderer owns the final HTML emission.
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a low impact on the confidentiality of the information. There is a low impact on the integrity of the data.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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