CVE-2026-93868: Weak RNG (CVSS 8.1)

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.

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CVSS v3.1 Score

8.1

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0073

Probability of exploitation

0.53%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-338 CWE-338

References

Other References

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

Frequently Asked Questions

What is CVE-2026-93868? +

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. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-93868? +

CVE-2026-93868 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0073, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-93868? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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