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CVE-2026-78191

WebDyne versions from 2.031 before 3.022 for Perl execute files with .psp anywhere in the name as Perl pages

Critical9.8EPSS 0.45%
Published
Updated
Reserved
Assigned by
CPANSec

Description

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.

Scores

CVSS scores of CVE-2026-78191, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Deferred3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.45% · top 60% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.

Weakness

Affected products

  • WebDyne

    • affected 2.031 – < 3.022

What to do

Solution: Upgrade to WebDyne 3.022 or later.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .