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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.

Miguel Ribeiro Wallos是Miguel Ribeiro个人开发者开源的一个开源个人订阅跟踪器。 Miguel Ribeiro Wallos 5.0.0之前版本存在安全漏洞，该漏洞源于输入验证层仅编码HTML元字符而未去除换行符，导出层在写入iCal输出前解码实体，导致经过身份验证的攻击者可通过在订阅名称或备注中嵌入原始CRLF序列，向导出的ICS订阅源注入任意iCalendar属性和事件，包括伪造组织者、任意邮件地址的ATTENDEE属性及误导性事件内容。

CVSS 4.6 · Medium EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
ellite Wallos < 5.0.0 affected
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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
Vulnerability Title
Miguel Ribeiro Wallos 输出处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Miguel Ribeiro Wallos是Miguel Ribeiro个人开发者开源的一个开源个人订阅跟踪器。 Miguel Ribeiro Wallos 5.0.0之前版本存在安全漏洞，该漏洞源于输入验证层仅编码HTML元字符而未去除换行符，导出层在写入iCal输出前解码实体，导致经过身份验证的攻击者可通过在订阅名称或备注中嵌入原始CRLF序列，向导出的ICS订阅源注入任意iCalendar属性和事件，包括伪造组织者、任意邮件地址的ATTENDEE属性及误导性事件内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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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Patches & Fixes for CVE-2026-77353 (1)

Vendor Advisories for CVE-2026-77353 (1)

Vendor Pages for CVE-2026-77353 (1)

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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