---
id: "CVE-2026-126778"
page: "https://infrastack.ai/live/CVE-2026-126778"
kind: "vulnerability"
aliases: ["CVE-2026-126778"]
title: "Wallos: stored script injection via notification responses runs in admin session"
severity: "medium"
cvss: 5.4
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Wallos", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["other", "php", "self-hosted", "wallos"]
not_affected_if: ["managed-hosting", "no-untrusted-registration", "version-5.10.3-or-later"]
published_at: "2026-11-11T19:17:38+00:00"
first_seen_at: "2026-11-11T19:28:47+00:00"
updated_at: "2026-11-11T19:30:27+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126778", "first_seen_at": "2026-11-11T19:28:47+00:00"}]
exploit_sources: []
---

# Wallos: stored script injection via notification responses runs in admin session

Link for people: https://infrastack.ai/live/CVE-2026-126778 (this .md is for agents)

Wallos, a self-hosted subscription tracker, fails to escape responses from notification services in sendnotifications.php, so a registered user can store JavaScript that runs when an administrator opens that page. The attacker gets the administrator's session, which can expose or change data in the app.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Wallos affected range not listed fixed no fixed version listed

## How to check

- Check the installed Wallos version; it is affected if it is from `4.4.0` up to but not including `5.10.3`
- Look at the Wallos instance's `endpoints/cronjobs/sendnotifications.php` file and confirm whether it outputs notification service responses unescaped
- Review which users are registered on the instance; registration by untrusted people raises the risk

## Fix

- Wallos: move to `5.10.3` or later

## Timeline

- 2026-11-11T19:28:47+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-126778

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/wallos-4.4.0-before-5.10.3-stored-xss-via-sendnotifications-php
- [fix] Patch: github.com https://github.com/ellite/Wallos/commit/693d8676f3e5b0c85e120fc5958ccb82f37ee89c
- [fix] Release notes: github.com https://github.com/ellite/Wallos/releases/tag/v5.10.3

## From the sources

Wallos 4.4.0 before 5.10.3 contains a stored cross-site scripting vulnerability in endpoints/cronjobs/sendnotifications.php that allows registered users to inject scripts via unescaped notification service responses. Attackers can point their Mattermost webhook URL or Web Push endpoint at a controlled server returning JavaScript, which executes in the administrator's session when sendnotifications.php is opened.

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