WebDyne session cookies lack Secure, HttpOnly and SameSite attributes
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
WebDyne versions from 2.014 before 3.022 for Perl issue session cookies without the Secure, HttpOnly and SameSite attributes (CWE-614). WebDyne::Session sets its session cookie with only a name, value and path. A network attacker or an injected script can steal the session ID, and another site can send requests that carry it. The attack requires user interaction.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
WebDyne versions from 2.014 before 3.022 for Perl issue session cookies without the Secure, HttpOnly and SameSite attributes. WebDyne::Session sets its session cookie with only a name, value and path. Browsers then send the session ID over plain HTTP and with cross-site requests, and expose it to page scripts. A network attacker or an injected script can steal the session, and another site can make requests that carry it.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | WebDyne | 2.014 to before 3.022 | 3.022 | Patch available | CNA |
- WebDyne Vendor— Affected 2.014 to before 3.022 Fixed in 3.022 Patch available CNA
Remediation
Upgrade WebDyne for Perl to version 3.022, the fixed version.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
- Fix · CNA WebDyne Fixed in 3.022
Timeline
- 2026-10-31 Threatist record created from CVE-2026-78188
- 2026-10-31 Alias added: GHSA-939g-4f3p-xc2m
- 2026-11-06 CVSS score added · CISA ADP
- 2026-11-06 CISA SSVC decision points changed
References
Sources
- CVE-2026-78188 · CVE Program
- CVE-2026-78188 · NVD
- FIRST EPSS
- GHSA-939g-4f3p-xc2m · GitHub Advisory Database · CC BY 4.0
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