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isso

Open actionable advisories and recorded vendor fixes. This public package view has no inventory attached and cannot establish whether your deployment is affected. A vendor fix never resolves your finding; verify your installed version and the source guidance.

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1 actionable advisory, newest first. Withdrawn advisories and news are excluded. Coverage is partial.

  1. Medium, CVSS 6.1PyPIAmendedPublished

    Isso affected by Stored XSS via comment website field

    CVE-2026-27469 · GHSA-9fww-8cpr-q66r

    Affected
    • PyPI isso < 0.13.2
    Fixed in
    0.13.2· Vendor fix available
    Issue
    Impact This is a stored Cross-Site Scripting (XSS) vulnerability affecting the website and author comment fields. The website field was HTML-escaped using quote=False, which left single and double quotes unescaped. Since the frontend inserts the website value directly into a single-quoted href attribute via string concatenation, a single quote in the URL breaks out of the attribute context, allowing injection of arbitrary event handlers (e.g. onmouseover, onclick). The same escaping was missing entirely from the user-facing comment edit endpoint (PUT /id/<id) and the moderation edit endpoint (POST /id/<id/edit/<key). Any visitor to a page embedding isso comments is impacted. No authentication or interaction beyond mouse movement is required to trigger a payload — an attacker can post a comment anonymously (moderation is off by default) with a crafted website URL, and the payload persists in the database and fires on every page load. With the full-page invisible overlay technique…

    Recommended action: Upgrade to 0.13.2 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.

    Sources:osv.dev (1)github.com (2)Source checked Evidence →