GHSA-75mw-h36v-2jv7: Dosage Vulnerable to Stored Cross-Site Scripting (XSS) in HTML/RSS Output Handlers

June 26, 2026 (updated July 21, 2026)

The HTML and RSS output handlers in dosagelib/events.py write user-controlled content (comic text and page URLs) directly into generated files without proper HTML escaping. When a user scrapes a malicious webcomic and opens the generated HTML/RSS file, attacker-controlled JavaScript can execute in their browser.

CWE: CWE-79 - Improper Neutralization of Input During Web Page Generation (Cross-site Scripting)

References

github.com/advisories/GHSA-75mw-h36v-2jv7
github.com/webcomics/dosage/commit/b91fd5cc3889aed3d9cc81b98834648197b2859a
github.com/webcomics/dosage/releases/tag/3.3
github.com/webcomics/dosage/security/advisories/GHSA-75mw-h36v-2jv7

Code Behaviors & Features

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