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CVE-2026-77353— Wallos: iCalendar Injection via CRLF in Subscription Name/Notes Export

Quick assessment

Affected
ellite Wallos
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Wallos 是一个开源、可自托管的个人订阅追踪工具。在 5.0.0 版本之前，Wallos 允许经过身份验证的用户通过在订阅名称或备注中嵌入原始的 CRLF（回车换行）序列，向导出的 .ics 订阅源中注入任意的 iCalendar 属性和事件。 由于输入验证层仅对 HTML 元字符进行编码，但从未去除换行符，而导出层在生成 iCal 输出前会先将这些实体解码还原，因此，任何拥有有效账户的攻击者都可以构造一个订阅，使其名称能够“跳出”当前的 VEVENT 块，并在任何订阅了该源的日历应用中插入完全由攻击者控制的日

CVSS 4.6 · Medium
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I. Basic Information for CVE-2026-77353

Vulnerability Information
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Vulnerability Title
Wallos: iCalendar Injection via CRLF in Subscription Name/Notes Export
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输出中的特殊元素转义处理不恰当(注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ellite Wallos < 5.0.0 -

II. Public POCs for CVE-2026-77353

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III. Intelligence Information for CVE-2026-77353

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Other References for CVE-2026-77353 (3)

Same Patch Batch · ellite · 2026-08-31 · 13 CVEs total

CVE-2026-61640 8.5 HIGH Wallos: SSRF via OIDC Token/UserInfo URL Configuration
CVE-2026-61639 8.5 HIGH Wallos: Zip Slip path traversal in database restore writes files to webroot
CVE-2026-54600 8.2 HIGH Wallos: Unauthenticated database replacement via import endpoint on fresh install
CVE-2026-61638 8.2 HIGH Wallos: SSRF via Test Email Notification - unvalidated SMTP host/port
CVE-2026-77348 8.2 HIGH Wallos incomplete fix for CVE-2026-33407: unauthenticated httpoxy SSRF still reachable via
CVE-2026-61641 8.1 HIGH Wallos: OIDC account takeover via email-based account linking without `email_verified` che
CVE-2026-54598 7.5 HIGH Missing Authentication for Critical Function in wallos
CVE-2026-54599 7.5 HIGH Wallos: OIDC state parameter never validated — login CSRF / account takeover
CVE-2026-50199 4.3 MEDIUM Wallos: Cross-user Fixer/API Layer credential consumption in exchange-rate refresh
CVE-2026-50198 4.3 MEDIUM Wallos: Cross-user subscription cost inference via replacement_subscription_id
CVE-2026-77352 4.3 MEDIUM Wallos: Authenticated SSRF via per-user SMTP notification host (low-privilege user)
CVE-2026-77351 3.5 LOW Wallos: SSRF via Unvalidated User-Level SMTP Host in Email Notification Settings

IV. Related Vulnerabilities

Same product: Wallos
Same vendor: ellite
Same weakness: CWE-74

V. Comments for CVE-2026-77353

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