ellite Wallos up to 4.x crlf injection

Summaryinfo

A vulnerability was found in ellite Wallos up to 4.x. It has been declared as critical. This impacts an unknown function. The manipulation results in crlf injection. This vulnerability is cataloged as CVE-2026-77353. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical has been found in ellite Wallos up to 4.x. Affected is some unknown processing. The manipulation with an unknown input leads to a crlf injection vulnerability. CWE is classifying the issue as CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-77353 since 08/20/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available.

Upgrading to version 5.0.0 eliminates this vulnerability.

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Productinfo

Vendor

• ellite

Name

• Wallos

Version

• 4.x

Website

• Product: https://github.com/ellite/Wallos/

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