EUVD-2026-38581
GHSA-7v5m-pr3q-6453
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
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Alert meAnalysisAIv1 – Jun 17, 2026
Stored XSS in the HTML session export feature of pi-coding-agent allows script execution in an exported document when a user clicks a crafted Markdown link. Affected npm packages (@mariozechner/pi-coding-agent 0.27.5–0.73.1 and @earendil-works/pi-coding-agent 0.74.0–0.78.0) either omitted URL scheme validation entirely or implemented a blocklist that could be defeated by prepending C0 control characters (bytes 0x00–0x1F), which browsers silently strip before navigation. No public exploit is identified at time of analysis and this vulnerability is not in CISA KEV; the CVSS score of 2.5 and local attack vector reflect the multi-step, user-dependent exploitation chain discovered and responsibly disclosed by CrowdStrike researchers.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 3 packages in npm, euvd
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Severity by source
AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Primary rating from Vendor (https://github.com/earendil-works/pi) · only source for this CVE.
CVSS VectorVendor: https://github.com/earendil-works/pi
DescriptionCVE.org
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.
Blast Radius
ecosystem impact- 30 npm packages depend on @earendil-works/pi-coding-agent (30 direct, 0 indirect)
Ecosystem-wide dependent count for version 0.74.0.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
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