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TI-2026-82943 Aliases CVE-2026-118071GHSA-f3rx-q599-wf5g

Stored cross-site scripting in Joinchat button block message

Priority LOW 32CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.

Summary

The Joinchat WordPress plugin before 6.4.2 does not escape the message of its button block before outputting it in an HTML attribute on the front end, which is a cross-site scripting flaw (CWE-79). An authenticated user with the Author role or higher can store a script that runs in the browser of any visitor to the post, including administrators. An exploit link is listed in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Description from the CNA

The Joinchat WordPress plugin before 6.4.2 does not escape the message of its button block before outputting it in an HTML attribute on the front end, which could allow users with the Author role and above to perform Stored Cross-Site Scripting attacks against any visitor of the post, including administrators.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00235 14th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Joinchat (Unknown): 6.4.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
UnknownJoinchat6.3.2 to before 6.4.26.4.2Patch availableCNA
  • Joinchat VendorUnknown Affected 6.3.2 to before 6.4.2 Fixed in 6.4.2 Patch available CNA

Remediation

Update Joinchat to version 6.4.2 or later, which fixes the flaw in versions from 6.3.2 before 6.4.2.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

  • Fix · CNA Joinchat (Unknown) Fixed in 6.4.2

Timeline

  1. 2026-10-30 Threatist record created from CVE-2026-118071
  2. 2026-10-30 Alias added: GHSA-f3rx-q599-wf5g
  3. 2026-10-30 CVSS score added · CISA ADP
  4. 2026-10-30 Weakness changed · CISA ADP
  5. 2026-10-30 CISA SSVC decision points changed

References

Exploit 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences