CVE-2020-35933Public exploitNetwork attack vector

Script execution via unfiltered AJAX render options

Published Jan 1, 2021 · Updated Aug 4, 2024

Reflected XSS in Newsletter before 6.8.2 allows remote attackers to execute JavaScript in an authenticated victim's browser via AJAX. The tnpc_render_callback handler passes unfiltered options or base64-decoded JSON through restore_options_from_request to render_block, which reflects the content as executable script. Exploitation requires a logged-in victim to submit the crafted request; the script runs with that victim's WordPress session privileges.

CVSS severity6.5
Medium
EPSS probability0.85%
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 Newsletter before 6.8.2 allows remote attackers to execute JavaScript in an authenticated victim's browser via AJAX. The tnpc_render_callback handler passes unfiltered options or base64-decoded JSON through restore_options_from_request to render_block, which reflects the content as executable script. Exploitation requires a logged-in victim to submit the crafted request; the script runs with that victim's WordPress session privileges.

The record

CVE
CVE-2020-35933
Published
Jan 1, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1204
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 1, 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

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
6.5WordfenceCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
6.5MITRECVSS:3.1/AV:N/AC:L/PR:L/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 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')
T1204User 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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