CVE-2026-29971Public exploitNetwork attack vector

Browser script execution via unencoded reflected input

Published Apr 27, 2026 · Updated Apr 27, 2026

Reflected XSS in WebFileSys 2.31.1 allows remote attackers to execute JavaScript in a victim's browser through crafted requests. The login, search, ftpBackup, and error-rendering paths place user-controlled input into HTML or JavaScript contexts without output encoding. Exploitation requires a victim to open or submit a crafted request, enabling actions within that browser session.

CVSS severity6.1
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in WebFileSys 2.31.1 allows remote attackers to execute JavaScript in a victim's browser through crafted requests. The login, search, ftpBackup, and error-rendering paths place user-controlled input into HTML or JavaScript contexts without output encoding. Exploitation requires a victim to open or submit a crafted request, enabling actions within that browser session.

The record

CVE
CVE-2026-29971
Published
Apr 27, 2026
Updated
Apr 27, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1TenableCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.4TenableAV:N/AC:L/Au:N/C:P/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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