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Advisory record · GHSA-ffpg-gm3h-4p5p

Backdrop CMS Host Header Injection vulnerability

CVSS 6.1 MediumEPSS 0.0023 · 13th percentile

Published by the GitHub Advisory Database at 18 Nov 2025, 18:32 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
backdrop/backdropPackagist<=1.32.0No fixed version yet
Identifiers
GHSA-ffpg-gm3h-4p5p · CVE-2025-63828 · PKSA-2f77-cwcx-9j4j
Weakness (CWE)
CWE-601 · CWE-644
Tags
Published
18 Nov 2025
Updated
20 Nov 2025

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Backdrop CMS (backdrop/backdrop) versions up to and including 1.32.0 are affected by a Host Header Injection vulnerability. An attacker can manipulate the Host header in password reset requests, which can redirect users to malicious domains and may enable session hijacking through cookie injection. The source gives few details about the required attacker position or user interaction. No fixed version is listed.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.1 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N ADP (CISA-ADP)
  • CISA KEV Not listed.
  • EPSS 0.0023, the 13th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 18 Nov 2025, 18:16 UTC Confirmed by NVD
  2. 31 Oct 2026, 14:26 UTC First seen by agentprime
  3. 31 Oct 2026, 14:26 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.