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GHSA-7v5m-pr3q-6453
No affected components available
Potential XSS in HTML session exports via Markdown URL handling
Pi HTML exports render session Markdown into a static HTML file. Affected versions did not consistently reject unsafe Markdown link and image URL schemes. In versions with scheme filtering, C0 control characters in the URL scheme could bypass the check because browsers normalize those characters before navigation.
Impact
The realistic attack path is indirect. An attacker would need to get suitable Markdown into a session, for example through prompt injection that causes the model to include an unsafe link, or through other untrusted session content. The user would then need to export the session as HTML, open or share that file, and click the link.
If triggered, script runs in the exported document, not in pi or the user's shell. The main risk is limited disclosure of data embedded in that exported session file.
Affected versions
- Affected:
@mariozechner/pi-coding-agent >= 0.27.5, <= 0.73.1 - Affected:
@earendil-works/pi-coding-agent >= 0.74.0, < 0.78.1 - Patched:
@earendil-works/pi-coding-agent 0.78.1
The old @mariozechner/pi-coding-agent package scope has no patched release. It was renamed to @earendil-works/pi-coding-agent; users of the old scope should migrate to the new package and upgrade to version 0.78.1 or later.
Resolution
Version 0.78.1 sanitizes Markdown link and image URLs with an allow-list after stripping C0 control characters.
Recommendations
Upgrade @earendil-works/pi-coding-agent to version 0.78.1 or later. Regenerate shared HTML exports after upgrading if the underlying sessions contained untrusted content.
Timeline
- 2026-05-29: Report received through GitHub Security Advisories
- 2026-06-02: Fix committed
- 2026-06-04: Fixed version 0.78.1 released
- 2026-06-08: Advisory prepared for publication
Credits
Reported by Paul Urian and Cosmin Alexa of CrowdStrike.
The vulnerability requires local access to the device to be exploited. It is difficult for an attacker to exploit this vulnerability and may require special conditions. 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 impact is confined to the system where the vulnerability exists. There is a low impact on the confidentiality of the information.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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