CVE-2026-66706Network attack vector

Author-level stored XSS

Published Aug 6, 2026 · Updated Aug 6, 2026

Stored cross-site scripting in Mark Jaquith Subscribe to Comments 2.3.1 and earlier allows remote authenticated users to inject scripts. Patchstack identifies an author-controlled stored script injection but does not disclose the affected field, function, or missing encoding operation. Author privileges and interaction by another user are required; the payload then executes in that visitor's browser and can alter content or act with the browser session's access.

CVSS severity5.9
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Mark Jaquith Subscribe to Comments 2.3.1 and earlier allows remote authenticated users to inject scripts. Patchstack identifies an author-controlled stored script injection but does not disclose the affected field, function, or missing encoding operation. Author privileges and interaction by another user are required; the payload then executes in that visitor's browser and can alter content or act with the browser session's access.

The record

CVE
CVE-2026-66706
Published
Aug 6, 2026
Updated
Aug 6, 2026
Vendor
Mark Jaquith
Product
Subscribe to Comments
Classifications
CWE-79, CAPEC-592, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 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?

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

  1. Affected versionversion=n/a <=2.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mark Jaquith · Subscribe to Commentsversion=n/a <=2.3.1

Published CVSS scores

5.9PatchstackCVSS:3.1/AV:N/AC:L/PR:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1203Exploitation for Client Execution

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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