CVE-2025-61773Public exploitNetwork attack vector

Unauthenticated session compromise via reflected CNL script injection

Published Oct 9, 2025 · Updated Oct 9, 2025

Cross-site scripting in the pyLoad web interface before 0.5.0b3.dev91 allows remote attackers to execute JavaScript via crafted CNL requests. The /flash/addcrypted2 handler accepts the jk parameter without adequate validation or output encoding, reflecting attacker-supplied JavaScript into the browser context. No authentication is required, but a user must process the crafted response; successful exploitation exposes the victim's session to data theft and unauthorized actions.

CVSS severity8.1
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in the pyLoad web interface before 0.5.0b3.dev91 allows remote attackers to execute JavaScript via crafted CNL requests. The /flash/addcrypted2 handler accepts the jk parameter without adequate validation or output encoding, reflecting attacker-supplied JavaScript into the browser context. No authentication is required, but a user must process the crafted response; successful exploitation exposes the victim's session to data theft and unauthorized actions.

The record

CVE
CVE-2025-61773
Published
Oct 9, 2025
Updated
Oct 9, 2025
Vendor
pyLoad
Product
pyLoad
Classifications
CWE-74, CWE-79, CWE-116, CWE-94, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 0.5.0b3.dev91

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

pyLoad · pyLoadversion=< 0.5.0b3.dev91

Published CVSS scores

8.1GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-116Improper Encoding or Escaping of Output
CWE-94Improper Control of Generation of Code ('Code Injection')
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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