CVE-2026-2987Network attack vector

Unauthenticated stored XSS via unsanitized chat messages

Published Mar 12, 2026 · Updated Mar 12, 2026

Stored XSS in Jeff Starr Simple Ajax Chat 20260217 and earlier allows remote attackers to inject scripts through chat messages. The chat submission path accepts the c parameter without sufficient sanitization and later renders the stored message without output escaping. Execution requires a user to open a page containing the chat, exposing that user's browser session to attacker-controlled script.

CVSS severity6.1
Medium
EPSS probability0.17%
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 20260217 and earlier allows remote attackers to inject scripts through chat messages. The chat submission path accepts the c parameter without sufficient sanitization and later renders the stored message without output escaping. Execution requires a user to open a page containing the chat, exposing that user's browser session to attacker-controlled script.

The record

CVE
CVE-2026-2987
Published
Mar 12, 2026
Updated
Mar 12, 2026
Vendor
Plugin Planet
Product
Simple Ajax Chat
Classifications
CWE-79, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 12, 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=* <=20260217

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Plugin Planet · Simple Ajax Chatversion=* <=20260217

Published CVSS scores

6.1WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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