CVE-2026-77830Network attack vector

Stored XSS via unescaped comment aria-label output

Published Sep 5, 2026 · Updated Sep 8, 2026

Stored XSS in Spam protection, Honeypot, Anti-Spam by CleanTalk 6.86 and earlier allows remote attackers to execute scripts in visitors' browsers. The contacts encoder places attacker-controlled comment content in an aria-label attribute without sufficient input sanitization or output escaping. Unauthenticated comment submission delivers the payload, but it runs only for non-logged-in visitors and moderation requires approval before publication.

CVSS severity7.2
High
EPSS probability0.27%
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 Spam protection, Honeypot, Anti-Spam by CleanTalk 6.86 and earlier allows remote attackers to execute scripts in visitors' browsers. The contacts encoder places attacker-controlled comment content in an aria-label attribute without sufficient input sanitization or output escaping. Unauthenticated comment submission delivers the payload, but it runs only for non-logged-in visitors and moderation requires approval before publication.

The record

CVE
CVE-2026-77830
Published
Sep 5, 2026
Updated
Sep 8, 2026
Vendor
CleanTalk
Product
Spam protection, Honeypot, Anti-Spam by CleanTalk
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 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 <=6.86

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CleanTalk · Spam protection, Honeypot, Anti-Spam by CleanTalkversion=0 <=6.86

Published CVSS scores

7.2WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

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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