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

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2025-62710: 0.20% estimated exploitation activity in the next 30 days; percentile 9.86 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact 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. Patches SAK-49866 is patched in Sakai 23.5, 25.0, and trunk. Credits - Reported by Suraj Gangwar. - Patched by Sam Ottenhoff (Longsight).

Published by the source

22 Oct 2025, 19:41 UTC

Last modified by the source

24 Oct 2025, 18:27 UTC

Source last checked

26 Oct 2026, 16:40 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-gr7h-xw4f-wh86

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# Patch Next advisory brief: CVE-2025-62710

Advisory: Sakai kernel-impl: predictable PRNG used to generate server‑side encryption key in EncryptionUtilityServiceImpl
IDs: CVE-2025-62710, GHSA-gr7h-xw4f-wh86
Record: https://patchnext.com/advisories/cve-2025-62710 (revision 1, source checked 26 Oct 2026, 16:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.sakaiproject.kernel:sakai-kernel-impl: affected <= 23.3

## Suggested inspection (read-only)
- Maven org.sakaiproject.kernel:sakai-kernel-impl: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.sakaiproject.kernel:sakai-kernel-impl.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-gr7h-xw4f-wh86 (GitHub-reviewed advisory GHSA-gr7h-xw4f-wh86 lists affected ranges: Maven org.sakaiproject.kernel:sakai-kernel-impl >=0 <=23.3)

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