Vulnerability · Published Nov 20, 2025 · Assigned by GitHub_M

CVE-2025-62724Open OnDemand allowlist bypass using symlinks in directory downloads (TOCTOU)

Medium 4.3

In plain English

A medium-severity security flaw in ondemand from OSC. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.2%top 87.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Open OnDemand is an open-source HPC portal. Prior to versions 4.0.8 and 3.1.16, users can craft a "Time of Check to Time of Use" (TOCTOU) attack when downloading zip files to access files outside of the OOD_ALLOWLIST. This vulnerability impacts sites that use the file browser allowlists in all current versions of OOD. However, files accessed are still protected by the UNIX permissions. Open OnDemand versions 4.0.8 and 3.1.16 have been patched for this vulnerability.

Affected products (as reported)

Vendor	Product	Versions
OSC	ondemand	< 4.0.8< 3.1.16

Weakness: CWE-61, CWE-367 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

https://github.com/OSC/ondemand/security/advisories/GHSA-vjpg-34px-gjrw x_refsource_CONFIRM