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8.1

LinkAce password reset link can be hijacked

CVE-2026-40905 · published 6 months ago
Summary

LinkAce versions before 2.5.4 use a web request header that can be forged to change the address in password reset emails. An attacker who manipulates this header can make the email contain a link to their own site, capture the reset token, and take over the user’s account. Upgrade to version 2.5.4 or later to stop this from happening.

Original advisory text
LinkAce: Password Reset Poisoning via X-Forwarded-Host Header Injection Leading to Account Takeover
LinkAce is a self-hosted archive to collect website links. Prior to 2.5.4, a password reset poisoning vulnerability was identified in the application due to improper trust of user-controlled HTTP headers. The application uses the X-Forwarded-Host header when generating password reset URLs. By manipulating this header during a password reset request, an attacker can inject an attacker-controlled domain into the reset link sent via email. As a result, the victim receives a password reset email containing a malicious link pointing to an attacker-controlled domain. When the victim clicks the link, the password reset token is transmitted to the attacker-controlled server. An attacker can capture this token and use it to reset the victim’s password, leading to full account takeover. This vulnerability is fixed in 2.5.4.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
8.1 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-601Open Redirect
Timeline
Published21 Apr 2026
Updated3 Nov 2026
First seen21 Apr 2026
Sources
CVE-2026-40905 · NVD
CVE-2026-40905 · OSV
GHSA-48wv-jpf4-vjfv · GHSA
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