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CVE-2026-104656

Cross-site Scripting in Progress Telerik Fiddler Everywhere

CVSS score

7.3

EPSS probability

%0.2

Risk score

0.0

Published

1 d ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

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Vulnerability description

DayBreach AI Explanation

Verified against sources

XSS in Progress Telerik Fiddler Everywhere (CVE-2026-104656)

Sources read

1

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

Improper input neutralization in the sessions grid of Progress Telerik Fiddler Everywhere versions 8.3.0 and earlier allows an attacker to execute backend IPC commands by convincing a user to open a crafted SAZ file. The vulnerability is high severity (CVSS 7.3) and is not listed in the CISA KEV; patch status could not be verified in official sources.

Why does it matter?

Executing unauthorized backend commands via a local file can lead to system compromise and exposure of sensitive data.

What should be done?

  • Monitor the vendor’s security advisory
  • Apply a patch when released
  • Upgrade to version 8.3.0 or later
  • Avoid opening untrusted SAZ files
  • Monitor application and system logs
Chain of evidence and sources3 verified claims

CVE-2026-104656, Progress Telerik Fiddler Everywhere’da oturum ızgarasındaki yetersiz girdi temizliği nedeniyle Cross‑Site Scripting (XSS) açığıdır.

S0 · daybreach-canonicalS1 · cvelist

Açık, 8.3.0 öncesi tüm sürümleri etkiler; resmi kaynaklarda yama durumu doğrulanamadığı için belirsizdir.

S0 · daybreach-canonical

CVE, CISA KEV listesinde yer almıyor; aktif istismar kanıtı bulunmamaktadır.

S0 · daybreach-canonical
Show the technical text from the sources

Improper neutralization of input in the sessions grid in Progress Telerik Fiddler Everywhere 8.3.0 and earlier allows an attacker to execute backend IPC commands by convincing a user to open a specially crafted SAZ file.

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

CWE: CWE-79

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-104656 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1Progress SoftwareProgress® Telerik® Fiddler® Everywhere View
Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
7.3CVSS V31HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:LNVD
7.3CVSS V3_1HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:LCVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-104656 is associated with the following CWEs:

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-104656 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureYerel erişim
PermissionsGerekmiyor
UserGerekiyor

Official Sources and Advisories

https://www.telerik.com/fiddler/fiddler-everywhere/documentation/knowledge-base/kb-security-cross-site-scripting-cve-2026-104656vendor-advisory

CVSS Vector Radar Chart

7.3 / 10
Attack VectorLocalComplexityLowPrivilegesNoneUser Interact.RequiredConfidentialityLowIntegrityHighAvailabilityLow

Vulnerability Scoring Details

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredNone required
User Interaction—
Confidentiality (Gizlilik)Low
Integrity (Bütünlük)High
Availability (Erişilebilirlik)Low

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

PS
Progress Software logo
Progress Software

Weakness Type (CWE & CAPEC)

CWE-79

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