CVE-2020-35592Public exploitNetwork attack vector

Session-cookie theft via reflected Origin header

Published Feb 18, 2021 · Updated Aug 4, 2024

Reflected XSS in Pi-hole 5.0, 5.1, and 5.1.1 allows remote attackers to steal session cookies through a crafted HTTP request. The admin/ endpoint reflects an unsanitized Origin header into its response, causing a victim’s browser to execute injected script. Exploitation requires an authenticated user to open an attacker-controlled page, and the missing HttpOnly flag exposes the PHP session cookie.

CVSS severity5.4
Medium
EPSS probability0.86%
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 Pi-hole 5.0, 5.1, and 5.1.1 allows remote attackers to steal session cookies through a crafted HTTP request. The admin/ endpoint reflects an unsanitized Origin header into its response, causing a victim’s browser to execute injected script. Exploitation requires an authenticated user to open an attacker-controlled page, and the missing HttpOnly flag exposes the PHP session cookie.

The record

CVE
CVE-2020-35592
Published
Feb 18, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, CAPEC-591, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 18, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-591Reflected XSS
T1189Drive-by Compromise

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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