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TI-2026-04390 Aliases CVE-2026-5032GHSA-fxg7-rh9m-q77p

W3 Total Cache <= 2.9.3 - Unauthenticated Security Token Exposure via User-Agent Header

Priority MEDIUM 45CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-200.

Summary

The W3 Total Cache plugin for WordPress is vulnerable to information exposure in all versions up to, and including, 2.9.3. This is due to the plugin bypassing its entire output buffering and processing pipeline when the request's User-Agent header contains "W3 Total Cache", which causes raw mfunc/mclude dynamic fragment HTML comments — including the W3TC_DYNAMIC_SECURITY security token — to be rendered in the page source. This makes it possible for unauthenticated attackers to discover the value of the W3TC_DYNAMIC_SECURITY constant by sending a crafted User-Agent header to any page that contains developer-placed dynamic fragment tags, granted the site has the fragment caching feature enabled. With the leaked W3TC_DYNAMIC_SECURITY token, an attacker can craft valid mfunc tags to execute arbitrary PHP code on the server, achieving remote code execution.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.03211 88th 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
BoldGridW3 Total Cacheup to 2.9.3—No fix listedCNA
  • W3 Total Cache VendorBoldGrid Affected up to 2.9.3 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:boldgrid:w3_total_cache:*:*:*:*:*:*:*:*——BoldGrid
  • cpe:2.3:a:boldgrid:w3_total_cache:*:*:*:*:*:*:*:* Versions — — ·BoldGrid

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-5032
  2. 2026-10-03 Alias added: GHSA-fxg7-rh9m-q77p

References

Other 3

  • TI-2013-01782 WordPress W3 Total Cache Plugin 0.9.2.8 has a Remote PHP Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2019-04758 pub/sns.php in the W3 Total Cache plugin before 0.9.4 for WordPress allows remote… CVSS 3.1HIGH 7.5
  • TI-2025-39670 WordPress Client Invoicing by Sprout Invoices plugin <= 20.8.7 - PHP Object Injection vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2026-08154 W3 Total Cache <= 2.9.4 - Unauthenticated Arbitrary File Read via 'f_array[]' Parameter CVSS 3.1HIGH 7.5
  • TI-2024-11141 W3 Total Cache <= 2.8.1 Information Exposure via Log Files CVSS 3.1HIGH 7.5
  • TI-2020-18983 Total Upkeep by BoldGrid <= 1.14.9 - Unauthenticated Backup Download CVSS 3.1HIGH 7.5
See all 67 →

Sources

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