---
id: CVE-2026-93868
title: >-
  Cotonti through 1.0.0 derives password recovery validation tokens from
  md5(microtime()) in users.passrecover.php, creating a predictable token space
  of approximately one million values per second
summary: >-
  Cotonti through 1.0.0 derives password recovery validation tokens from
  md5(microtime()) in users.passrecover.php, creating a predictable token space
  of approximately one million values per second. Unauthenticated attackers can
  read the s…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-338
vendor: Cotonti
product: Cotonti
affected:
  - Cotonti <= 1.0.0
published: '2026-09-18'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T20:53:07.383'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93868'
references:
  - url: 'https://github.com/Cotonti/Cotonti'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/Cotonti/Cotonti/blob/1.0.0/modules/users/inc/users.passrecover.php
    label: disclosure@vulncheck.com
  - url: 'https://github.com/Cotonti/Cotonti/issues/1890'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/Cotonti/Cotonti/pull/1898'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/cotonti-through-1.0.0-predictable-password-recovery-token-via-weak-prng
    label: disclosure@vulncheck.com
  - url: 'https://github.com/Cotonti/Cotonti/issues/1890'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00734
epssPercentile: 0.52399
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-18T20:19:56.767733Z'
ingestedAt: '2026-09-18T20:51:25.688Z'
---

## Overview

Cotonti through 1.0.0 derives password recovery validation tokens from md5(microtime()) in users.passrecover.php, creating a predictable token space of approximately one million values per second. Unauthenticated attackers can read the server Date header, precompute candidate tokens within a narrow time window, and probe them against the passrecover authentication endpoint to reset any account password including administrators.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.