PSIRTSSL-VPN Symlink Persistence Patch Bypass
Summary
An Exposure of Sensitive Information to an Unauthorized Actor vulnerability [CWE-200] in FortiOS SSL-VPN may allow a remote unauthenticated attacker to bypass the patch developed for the symbolic link persistency mechanism observed in some post-exploit cases, via crafted HTTP requests. An attacker would need first to have compromised the product via another vulnerability, at filesystem level.
| Version | Affected | Solution |
|---|---|---|
| FortiOS 7.6 | 7.6.0 through 7.6.1 | Upgrade to 7.6.2 or above |
| FortiOS 7.4 | 7.4.0 through 7.4.6 | Upgrade to 7.4.7 or above |
| FortiOS 7.2 | 7.2 all versions | Migrate to a fixed release |
| FortiOS 7.0 | 7.0 all versions | Migrate to a fixed release |
| FortiOS 6.4 | 6.4 all versions | Migrate to a fixed release |
This vulnerability can only be abused as a consequence of a threat actor exploiting a known vulnerability to implement read-only access to vulnerable FortiGate devices, at file system level.
Products that never had SSL-VPN enabled, are not impacted by this issue.
Virtual Patch named "FG-VD-60389.0day." is available in FMWP db update 26.033
Acknowledgement
Fortinet is pleased to thank Peter Gabaldon from ITRESIT (https://itresit.es/en/home-en/) for reporting this vulnerability under responsible disclosure.Timeline
2026-02-10: Initial publication2026-03-12: Added IPS package info