Missing integrity verification in the Progress Software Fiddler Download and Setup Skill on Linux, macOS, and Windows which allows an attacker to compromise or influence a release component and execute attacker-controlled code when a user runs the skill. On macOS, the skill stages the package at a predictable path and installs it with administrator privileges, which may allow code execution with root privileges after user approval. A local process may also replace the staged macOS package while the skill waits for approval.
Severity
CVSS 3.1
7.5 high
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
0.2% estimated probability of exploitation activity in the next 30 days; 6th percentile. Scored 2026-11-10. A forecast for this CVE across the internet, not for your own systems.
CISA's assessment (SSVC)
Exploitation: none · Automatable: no · Technical impact: total, assessed 2026-11-06. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
CWEs
CWE-377Insecure Temporary Filedeprecated by MITRE CWE-494Download of Code Without Integrity Check
Show the promptExplain CVE-2026-104657 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-104657?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-104657?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-104657 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.
Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.
Affected
progress software:fiddler download & setup skill
Versions
From the CNA's record in the CVE List.
Product
Affected
Progress Software Fiddler Download & Setup Skill
before 8.3.0
Attack patterns (CAPEC)
CAPEC-149 Explore for Predictable Temporary File Names Severity: Medium
CAPEC-155 Screen Temporary Files for Sensitive Information Likelihood: Medium · Severity: Medium
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits. More on the page of CWE-494 (12).