CVE-2026-5084 WebDyne::Session versions before 3.003_704 for Perl generate the session id insecurely
Insecure session ID generation in WebDyne::Session allows attackers to predict IDs and hijack user sessions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-5084?
CVE-2026-5084 is a medium-severity vulnerability in ASPEER WebDyne::Session, published on 11 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
WebDyne::Session versions before 3.003_704 for Perl generate the session id insecurely.
The session handler generates the session id from an MD5 hash seeded with a call to the built-in rand() function. The rand function is passed a maximum value based on the process id, the epoch time and the reference address of the object, but this information will have no effect on the overall quality of the seed of the message digest.
The rand function is seeded by 32-bits and is predictable. It is considered unsuitable for cryptographic purposes.
Predictable session ids could allow an attacker to gain access to systems.
Note that WebDyne::Session versions 1.042 and earlier appear to be in separate distributions from WebDyne.
Which versions are affected by CVE-2026-5084?
How do I fix CVE-2026-5084?
No fix has been published for CVE-2026-5084 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-5084 being exploited?
There is no known exploitation of CVE-2026-5084 in the wild and no public exploit code.
Sources
Also known as GHSA-462c-h7qr-cxm6.