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TI-2026-03355 Aliases CVE-2026-3876GHSA-4mcf-jj9c-gvp6

Prismatic <= 3.7.3 - Unauthenticated Stored Cross-Site Scripting via 'prismatic_encoded' Pseudo-Shortcode

Priority LOW 37CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

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

Summary

The Prismatic plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'prismatic_encoded' pseudo-shortcode in all versions up to, and including, 3.7.3. This is due to insufficient input sanitization and output escaping on user-supplied attributes within the 'prismatic_decode' function. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page by submitting a comment containing a crafted 'prismatic_encoded' pseudo-shortcode.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00274 19th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
specialkPrismaticup to 3.7.3—No fix listedCNA
  • Prismatic Vendorspecialk Affected up to 3.7.3 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-3876
  2. 2026-10-03 Alias added: GHSA-4mcf-jj9c-gvp6

References

Other 2

  • TI-2024-01845 Simple Ajax Chat < 20240223 - Unauthenticated Stored XSS CVSS 3.1HIGH 7.1
  • TI-2024-02296 Simple Ajax Chat < 20240412 - Admin+ Stored XSS CVSS 3.1MEDIUM 5.4
  • TI-2024-04645 User Submitted Posts < 20240516 - Admin+ Stored XSS CVSS 3.1MEDIUM 4.8
  • TI-2019-15241 User Submitted Posts <= 20190312 - Unauthenticated Arbitrary File Upload CVSS 3.1CRITICAL 9.8
  • TI-2022-10732 WordPress Simple Ajax Chat plugin <= 20220115 - Sensitive Information Disclosure vulnerability CVSS 3.1HIGH 7.5
  • TI-2023-24406 WordPress User Submitted Posts Plugin <= 20230902 is vulnerable to Arbitrary File Upload CVSS 3.1CRITICAL 9.8
See all 44 →

Sources

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