CVE-2026-81825Network attack vector

Unauthenticated stored XSS via unsanitized chat messages

Published Sep 11, 2026 · Updated Sep 11, 2026

Stored XSS in Jeff Starr Simple Ajax Chat 20260811 and earlier allows remote attackers to run scripts in visitors' browsers via chat messages. The public submission nonce permits unauthenticated posting, while insufficient message sanitization and output escaping persistently render attacker-controlled markup. A visitor must load a page containing the chat; the script then runs in that visitor's WordPress origin, including for administrators.

CVSS severityUnavailable
Unscored
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Jeff Starr Simple Ajax Chat 20260811 and earlier allows remote attackers to run scripts in visitors' browsers via chat messages. The public submission nonce permits unauthenticated posting, while insufficient message sanitization and output escaping persistently render attacker-controlled markup. A visitor must load a page containing the chat; the script then runs in that visitor's WordPress origin, including for administrators.

The record

CVE
CVE-2026-81825
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
Plugin Planet
Product
Simple Ajax Chat
Classifications
T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=0 <=20260811

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Plugin Planet · Simple Ajax Chatversion=0 <=20260811

Published CVSS scores

No CVSS assessment is available in this record.

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.

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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 exploitUnconfirmed

Weakness, pattern, technique

T1189Drive-by Compromise

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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