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CVE-2026-104657

Missing Integrity Verification in Progress Software Fiddler Download & Setup Skill

Products / packages Progress Software Fiddler Download & Setup Skill

Published

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 22:25:34 UTC
ProgressSoftware · CVSS:3.1 · 7.5
Assessment vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Severity

high7.5

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Source guidance available

Review the recorded instructions. Guidance may be a workaround rather than a fixed version.

What this means

The Progress Software Fiddler Download and Setup Skill is affected by missing integrity verification, allowing an attacker to compromise a release component. This may enable code execution with administrator or root privileges on Linux, macOS, and Windows. A local process can replace the staged package on macOS.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Progress Software · ProgressSoftware

Fiddler Download & Setup Skill

1 range
ProgressSoftware version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → before 8.3.0

semver versions

unaffected

unknown

Other versions: unaffected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

Do not run the affected skill version. Install Fiddler manually from the official distribution source, verify the downloaded artifact's publisher signature and available checksum, and on macOS use a per-user DMG installation without administrator privileges.

ProgressSoftware guidance ↗

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

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.

References

1 sources
www.telerik.com/fiddler/fiddler-everywhere/documentation/knowledge-base/kb-security-missing-download-integrity-verification-cve-2026-104657
Vendor advisoryProgressSoftware

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-104657

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-494 ↗

CWE-494: Download of Code Without Integrity Check

ProgressSoftware

Related →
CWE-377 ↗

CWE-377: Insecure Temporary File

ProgressSoftware

Related →
Contributing organizations · 2
ProgressSoftware

Assigning organization

2026-11-09
CISA-ADP

Additional data publisher

2026-11-06

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
  1. CVE · CVE-2026-104657

    Observed 2026-11-06T18:21:27.658Z · upstream updated 2026-11-06T17:47:49.791Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-11-06T17:14:11.732315Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "total"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.