GHSA-95m2-chm4-mq7m
HIGHPHP-Textile has persistent XSS vulnerability in image link handling
Blast Radius
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Description
Details
Persistent XSS vulnerability in image link handling of PHP-Textile versions 4.1.2 and older, when running the parser in restricted mode. In restricted mode it is expected that the input would be sanitized, allowing user-input (such as user comments) to be parsed and handled safely by the PHP-Textile library.
In restricted mode, the version 4.1.2 of the library does not sanitize or validate user-controllable href input in image links, but allows any link protocol or JavaScriptt links to be used. The vulnerability allows an attacker to add malicious JavaScript code to the page which is then executed when an unexpecting user clicks the link.
In non-restricted mode, the library allows mixed HTML input, and any link protocol by design. In restricted mode, text links were already handled correctly and the vulnerability only affects image links.
Resolution
This issue was fixed in PHP-Textile version 4.1.3. Version 4.1.3 disallows use of JavaScript in image links when the parser is ran in restricted mode. Restricted mode can be enabled with Parser::setRestricted() method prior to calling the parse method. For more information, see Parsing unstructed input in the project's README.
PoC
The following Textile input:
!securing.pl(Click Tu)!:javascript:document.innerHTML='<script>alert(1);</script>'+document.cookie)
Would render as the following HTML even in restricted mode:
<p><a href="javascript:document.innerHTML='<script>alert(1);</script>'+document.cookie"><img alt="Click Tu" src="securing.pl" title="Click Tu"></a>)</p>
Impact
The attacker can perform any operation in the application with user’s privileges or remotely control user’s browser with automated tools.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | netcarver/textile | all versions | 4.1.3 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for netcarver/textile. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update netcarver/textile to 4.1.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-95m2-chm4-mq7m is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-95m2-chm4-mq7m is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-95m2-chm4-mq7m. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-95m2-chm4-mq7m in your dependencies?
O3 detects GHSA-95m2-chm4-mq7m across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.