CVE-2025-49909Network attack vector

Reflected script execution via undisclosed request input

Published Nov 6, 2025 · Updated Nov 6, 2025

Reflected XSS in PenciDesign Penci Bookmark & Follow before 2.4 allows remote attackers to execute script via crafted web requests. Patchstack has not disclosed the affected request parameter, code path, or missing output-encoding operation that reflects untrusted input into a response. Exploitation requires a victim to follow a crafted link or request, after which the script runs in the vulnerable site's browser context and can read or alter accessible data.

CVSS severity7.1
High
EPSS probability0.21%
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 PenciDesign Penci Bookmark & Follow before 2.4 allows remote attackers to execute script via crafted web requests. Patchstack has not disclosed the affected request parameter, code path, or missing output-encoding operation that reflects untrusted input into a response. Exploitation requires a victim to follow a crafted link or request, after which the script runs in the vulnerable site's browser context and can read or alter accessible data.

The record

CVE
CVE-2025-49909
Published
Nov 6, 2025
Updated
Nov 6, 2025
Vendor
PenciDesign
Product
Penci Bookmark & Follow
Classifications
CWE-79, CAPEC-591, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 6, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a <=< 2.4 changes=[{"at":"2.4","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PenciDesign · Penci Bookmark & Followversion=n/a <=< 2.4 changes=[{"at":"2.4","status":"unaffected"}]

Published CVSS scores

7.1PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-591Reflected XSS
T1204.001User Execution: Malicious Link

Public exploit references

No public exploit references are available in this record.

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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