WebDyne runs uploaded files with .psp in their name as Perl pages
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
WebDyne versions from 2.031 before 3.022 for Perl execute any file with .psp anywhere in its name as a Perl page. The regular expression that matches page names has no end anchor (CWE-777). An application that checks only the final extension on uploads lets a remote attacker upload a file such as report.psp.pdf and run its embedded Perl by requesting it.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
WebDyne versions from 2.031 before 3.022 for Perl execute files with .psp anywhere in the name as Perl pages. WebDyne decides whether to run a requested file as a page by matching its name against WEBDYNE_PSP_EXT_RE, which has no end anchor. An application that accepts uploads by checking only the final extension lets a remote attacker upload a file such as report.psp.pdf and run its embedded Perl by requesting it.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
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 | 2.031 to before 3.022 | 3.022 | Patch available | CNA |
- WebDyne Vendor— Affected 2.031 to before 3.022 Fixed in 3.022 Patch available CNA
Remediation
WebDyne version 3.022 fixes this flaw. Upgrade WebDyne to version 3.022.
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-2026-78191
- 2026-10-31 Alias added: GHSA-xv5f-qcmp-v8w2
- 2026-11-06 CVSS score added · CISA ADP
- 2026-11-06 CISA SSVC decision points changed
- 2026-11-06 Priority changed: LOW → MEDIUM
References
Sources
- CVE-2026-78191 · CVE Program
- CVE-2026-78191 · NVD
- FIRST EPSS
- GHSA-xv5f-qcmp-v8w2 · GitHub Advisory Database · CC BY 4.0
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