---
id: "CVE-2024-12139"
kind: "vulnerability"
aliases: ["CVE-2024-12139"]
title: "Error pages reflect URL input, enabling phishing-style fake error messages"
severity: "medium"
cvss: 4.3
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["other", "web-applications"]
not_affected_if: []
published_at: "2026-11-02T18:18:33+00:00"
first_seen_at: "2026-11-02T18:24:24+00:00"
updated_at: "2026-11-02T18:24:34+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-12139", "first_seen_at": "2026-11-02T18:24:24+00:00"}]
---

# Error pages reflect URL input, enabling phishing-style fake error messages

The error handling in an unnamed application does not sanitize user-supplied URL parameters under specific conditions. An attacker can craft a link that injects arbitrary content into displayed error messages, enabling phishing or credential theft.

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

## Timeline

- 2026-11-02T18:24:24+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2024-12139

## From the sources

The error handling implementation fails to properly sanitize or validate user-supplied input within URL parameters under specific conditions. This allows end-users to manipulate the error messages that are displayed by the application.

By exploiting this vulnerability, malicious actors can inject arbitrary content into error messages. This enables them to perform social engineering attacks, such as phishing or credential theft, by replacing legitimate error messages with malicious content, misleading users into compromising sensitive information or taking harmful actions.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_