CVE-2026-25726 | Cloudreve up to 4.12.x API Endpoint time.Now.UnixNano weak prng (GHSA-f8xp-wvcx-p6f4)

VDB-355204 · CVE-2026-25726 · GHSA-F8XP-WVCX-P6F4 CLOUDREVE UP TO 4.12.X API ENDPOINT TIME.NOW.UNIXNANO WEAK PRNG HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.8 $0-$5k 0.48+ Summaryinfo A vulnerability labeled as problematic has been found in Cloudreve up to 4.12.x. This vulnerability affects the function time.Now.UnixNano of the component API Endpoint. Executing a manipulation can lead to weak prng. The identification of this vulnerability is CVE-2026-25726. The attack may be launched remotely. There is no exploit available. The affected component should be upgraded. Detailsinfo A vulnerability classified as problematic was found in Cloudreve up to 4.12.x. This vulnerability affects the function time.Now.UnixNano of the component API Endpoint. The manipulation with an unknown input leads to a weak prng vulnerability. The CWE definition for the vulnerability is CWE-338. The product uses a Pseudo-Random Number Generator (PRNG) in a security context, but the PRNG's algorithm is not cryptographically strong. As an impact it is known to affect confidentiality. CVE summarizes: Cloudreve is a self-hosted file management and sharing system. Prior to version 4.13.0, the application uses the weak pseudo-random number generator math/rand seeded with time.Now().UnixNano() to generate critical security secrets, including the secret_key, and hash_id_salt. These secrets are generated upon first startup and persisted in the database. An attacker can exploit this by obtaining the administrator's account creation time (via public API endpoints) to narrow the search window for the PRNG seed, and use known hashid to validate the seed. By brute-forcing the seed (demonstrated to take <3 hours on general consumer PC), an attacker can predict the secret_key. This allows them to forge valid JSON Web Tokens (JWTs) for any user, including administrators, leading to full account takeover and privilege escalation. This issue has been patched in version 4.13.0. The advisory is shared for download at github.com. This vulnerability was named CVE-2026-25726 since 02/05/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1600.001. Upgrading to version 4.13.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Productinfo Type Cloud Software Name Cloudreve Version 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 4.11 4.12 Website Product: https://github.com/cloudreve/cloudreve/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 5.9 VulDB Meta Temp Score: 5.8 VulDB Base Score: 3.7 VulDB Temp Score: 3.6 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 8.1 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Weak prng CWE: CWE-338 / CWE-331 / CWE-330 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: Cloudreve 4.13.0 Timelineinfo 02/05/2026 CVE reserved 04/03/2026 +56 days Advisory disclosed 04/03/2026 +0 days VulDB entry created 04/03/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-f8xp-wvcx-p6f4 Status: Confirmed CVE: CVE-2026-25726 (🔒) GCVE (CVE): GCVE-0-2026-25726 GCVE (VulDB): GCVE-100-355204 Entryinfo Created: 04/03/2026 23:28 Changes: 04/03/2026 23:28 (67) Complete: 🔍 Cache ID: 99:D5C:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸