# CVE-2026-127088: 2FAuth before 9.0.1 Password Reset Poisoning via Host Header

Status: published. Published: 2026-11-13. Updated: 2026-11-13.

2FAuth before 9.0.1 contains a weak password recovery vulnerability that allows unauthenticated attackers to poison reset links by forging the HTTP Host header. Attackers can request password or WebAuthn recovery emails with an attacker-controlled host, capture the victim's token, and take over accounts exposing stored TOTP/HOTP secrets.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/Bubka/2FAuth/commit/35ce085b69f9f5044dfb94017c3f27c1dc2668f3

## Affected products and versions

- Bubka / 2FAuth (Bubka/2FAuth): ≥ 0; < 9.0.1 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.6 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 8.1 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N; source: CNA: VulnCheck

- CVSS 4.0: 8.6 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 8.1 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.54% as of 2026-11-13; percentile 46.01%

- SSVC: exploitation none; automatable yes; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-640

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/Bubka/2FAuth/security/advisories/GHSA-v9qw-r94g-95qv (CNA: VulnCheck; vendor-advisory)

- https://github.com/Bubka/2FAuth/commit/35ce085b69f9f5044dfb94017c3f27c1dc2668f3 (CNA: VulnCheck; patch)

- https://github.com/Bubka/2FAuth/releases/tag/v9.0.1 (CNA: VulnCheck; release-notes)

- https://github.com/Bubka/2FAuth/blob/v9.0.0/app/Http/Kernel.php#L47 (CNA: VulnCheck; technical-description)

- https://github.com/Bubka/2FAuth/blob/v9.0.0/app/Notifications/WebauthnRecoveryNotification.php#L62-L64 (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/2fauth-before-9.0.1-password-reset-poisoning-via-host-header (CNA: VulnCheck; third-party-advisory)

- https://github.com/Bubka/2FAuth/blob/v9.0.0/app/Http/Kernel.php#L47 (disclosure@vulncheck.com)

- https://github.com/Bubka/2FAuth/blob/v9.0.0/app/Notifications/WebauthnRecoveryNotification.php#L62-L64 (disclosure@vulncheck.com)

- https://github.com/Bubka/2FAuth/commit/35ce085b69f9f5044dfb94017c3f27c1dc2668f3 (disclosure@vulncheck.com)

- https://github.com/Bubka/2FAuth/releases/tag/v9.0.1 (disclosure@vulncheck.com)

- https://github.com/Bubka/2FAuth/security/advisories/GHSA-v9qw-r94g-95qv (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/2fauth-before-9.0.1-password-reset-poisoning-via-host-header (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-127088; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-127088; retrieved 2026-11-14; source updated 2026-11-13

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-127088; retrieved 2026-11-13; source updated Not reported

Revision: 7020aa5aea8e6a40a598eed1c2363e78fe766ddf51f985ec8620fc66d9225e1b

Canonical: https://y2.dev/cve/CVE-2026-127088

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