Security readout for executives and security teams
Plain-English summary
A critical flaw in W3 Total Cache before 2.10.5 lets an unauthenticated internet attacker write or overwrite files in existing server directories. On Apache, attackers can overwrite .htaccess files, potentially taking sites offline and removing security rules. Confidentiality impact is not established, but integrity and availability risks are severe.
Executive priority
Remediate immediately on public-facing sites. Prioritize Apache deployments and business-critical WordPress services because exploitation could overwrite files, disrupt availability, and remove access or hardening controls without credentials. Investigate for file changes rather than assuming an upgrade alone reverses prior damage.
Technical view
Improper path validation in the page-cache key permits path traversal and arbitrary file writes outside the intended cache directory. Exploitation requires no authentication or user interaction. The CVSS 3.1 score is 10.0, with high integrity and availability impact and changed scope. Apache deployments additionally risk .htaccess overwrite.
Likely exposure
Internet-accessible WordPress sites running W3 Total Cache earlier than 2.10.5 are potentially exposed. Apache-hosted sites face the specifically documented .htaccess risk. The supplied affected-product metadata is inconsistent, listing version “0” and default status unaffected, so inventory validation is important.
Exploitation context
The WPScan reference is tagged as containing exploit information, but the supplied sources do not establish active exploitation. The CVE is not listed as KEV in the bundle. Treat exploitation as technically plausible because the flaw is remote, unauthenticated, low-complexity, and requires no user interaction.
Researcher notes
The weakness is classified as CWE-22. The supplied record supports arbitrary writes only into existing directories and overwrite of the target filename. It does not establish confidentiality loss, code execution, active exploitation, or a specific affected operating-system range. Product-version metadata conflicts with the narrative and warrants confirmation against current vendor information.
Mitigation direction
- Upgrade W3 Total Cache to version 2.10.5 or later.
- Check current vendor guidance for any additional remediation or configuration requirements.
- Temporarily disable the plugin if immediate upgrading is impossible.
- Restore altered .htaccess files from trusted backups and review their security rules.
Validation and detection
- Inventory WordPress sites and record installed W3 Total Cache versions.
- Confirm every installation is version 2.10.5 or later.
- Inspect .htaccess files for unexpected changes, especially on Apache servers.
- Review file-integrity and web-server logs for unexplained writes or cache-related anomalies.
- Verify affected sites and security controls operate normally after remediation.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-22: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-18051 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 10 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H3.95.8CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
10CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://wpscan.com/vulnerability/dc56cdd2-419b-4a64-9d2a-29dc7e79cb6d/CVE reference, WPScan · exploit, vdb-entry
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.