PT-2026-39577 · Unknown · Webdyne::Session

Stig Palmquist · Published 2026-05-11 · Updated 2026-05-15 · CVE-2026-5084

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions WebDyne::Session versions prior to 2.076

Description The session handler generates session identifiers insecurely using an MD5 hash seeded with the built-in rand() function. The rand() function is seeded by 32-bits, making it predictable and unsuitable for cryptographic purposes. This predictability could allow an attacker to gain unauthorized access to systems.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Weakness Enumeration

CWE-340

CWE-338

Related Identifiers

CVE-2026-5084

Affected Products

Webdyne::Session

References · 13

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5084.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-5084 · Security Note
• https://osv.dev/vulnerability/CVE-2026-5084 · Vendor Advisory
• https://github.com/aspeer/WebDyne · Note
• https://twitter.com/CVEnew/status/2053954498716983618 · Twitter Post
• https://webdyne.org · Note
• https://t.me/CVEtracker/53356 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2053769661871784194 · Twitter Post
• https://twitter.com/oss_security/status/2055155326559686841 · Twitter Post
• http://openwall.com/lists/oss-security/2026/05/11/3 · Note
• https://security.metacpan.org/docs/guides/random-data-for-security.html · Note
• https://metacpan.org/release/ASPEER/WebDyne-2.075/source/lib/WebDyne/Session.pm#L120 · Note
• https://cpan.org/modules · Note