Vulnerability Description
Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 5.0.0, Wallos allows authenticated users to inject arbitrary iCalendar properties and events into their exported .ics feed by embedding raw CRLF sequences in subscription names or notes. Because the input validation layer only encodes HTML metacharacters but never strips newlines, and the export layer decodes those entities back before writing iCal output, an attacker with any valid account can craft a subscription whose name breaks out of the current VEVENT block and inserts fully attacker-controlled calendar events — including spoofed organizers, arbitrary email addresses in ATTENDEE properties, and misleading event content — into any calendar application subscribed to that feed. This issue has been patched in version 5.0.0.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/ellite/Wallos/commit/11eaf402e841a628c68a805694227ce66c45f6f3
- https://github.com/ellite/Wallos/releases/tag/v5.0.0
- https://github.com/ellite/Wallos/security/advisories/GHSA-q2r8-m9wm-5547
- https://github.com/ellite/Wallos/security/advisories/GHSA-q2r8-m9wm-5547
FAQ
What is CVE-2026-77353?
CVE-2026-77353 is a vulnerability with a CVSS score of 4.6 (MEDIUM). Wallos is an open-source, self-hostable personal subscription tracker. Prior to version 5.0.0, Wallos allows authenticated users to inject arbitrary iCalendar properties and events into their exported...
How severe is CVE-2026-77353?
CVE-2026-77353 has been rated MEDIUM with a CVSS base score of 4.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-77353?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.