Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) Affecting github.com/hfo4/cloudreve/service/user package, versions <4.13.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-GOLANG-GITHUBCOMHFO4CLOUDREVESERVICEUSER-15930482
- published8 Apr 2026
- disclosed31 Mar 2026
- creditorenyomtov
Introduced: 31 Mar 2026
CVE-2026-25726 (opens in a new tab)How to fix?
Upgrade github.com/HFO4/cloudreve/service/user to version 4.13.0 or higher.
Overview
Affected versions of this package are vulnerable to Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) seeded with predictable values in the secret_key and hash_id_salt. An attacker can gain unauthorized access to any user account, including administrators, by brute-forcing the PRNG seed using publicly available account creation times and validating the seed with known hash IDs. This enables the attacker to forge valid authentication tokens and escalate privileges.
Note:
This is only exploitable if the instance was initially deployed with a version prior to 4.10.0, even if later upgraded.
Workaround
This vulnerability can be mitigated by manually rotating the critical secrets in the configuration file, replacing them with long, random values, and restarting the service.