Security readout for executives and security teams
Plain-English summary
This is a stored cross-site scripting flaw in GetSimpleCMS-CE. A logged-in administrator can save script content in a component slug, causing that script to run later in the CMS admin interface. The main risk is compromise of administrator sessions or unauthorized actions inside the CMS.
Executive priority
Treat as a moderate-priority CMS hardening issue. Patch affected sites promptly, especially where multiple administrators have access or the CMS manages public-facing content. It is not described as internet-wormable or actively exploited in the supplied sources.
Technical view
GetSimpleCMS-CE versions before 3.3.22 are affected, with 3.3.16 tested. The components.php Theme to Components feature stores the slug field without proper output encoding, then renders it in the authenticated administrative interface. The issue is classified as CWE-79 with CVSS 4.0 score 4.8.
Likely exposure
Exposure is limited to GetSimpleCMS-CE deployments before 3.3.22 where authenticated administrators can manage theme components. High privileges are required, reducing broad external risk, but shared admin teams, reused credentials, or compromised admin accounts can make persistence inside the CMS more serious.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not listed as KEV. Exploitation requires administrator authentication and a user viewing the affected Components page. The advisory describes potential session hijacking, unauthorized administrative actions, and persistent compromise of the admin interface.
Researcher notes
The evidence identifies the vulnerable sink as administrative rendering of the component slug from XML, while other fields use safe_slash_html(). Public evidence supports affected versions before 3.3.22 and a patch release, but does not provide broad exploitation telemetry.
Mitigation direction
- Upgrade GetSimpleCMS-CE to version 3.3.22 or later.
- Review vendor advisory and release notes for approved remediation details.
- Restrict CMS administrator access to trusted users and networks where feasible.
- Review component slugs for unexpected script content and remove suspicious entries.
- Rotate administrator sessions or credentials if malicious admin execution is suspected.
Validation and detection
- Inventory GetSimpleCMS-CE installations and confirm each reported version.
- Identify systems below 3.3.22 and prioritize administrator-facing sites.
- Review Components page data for suspicious slug values or unexpected script-like content.
- Confirm upgraded systems are running 3.3.22 or later.
- Check admin audit logs for unusual component edits or account activity.
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-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. 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 lookupCVE-2026-26351 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
- Medium
- CVSS
- 4.8 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
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:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
4.8MediumVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
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://github.com/GetSimpleCMS-CE/GetSimpleCMS-CE/security/advisories/GHSA-95f7-vm92-8gpxCVE reference, VulnCheck · vendor-advisory
- https://github.com/GetSimpleCMS-CE/GetSimpleCMS-CE/releases/tag/v3.3.22CVE reference, VulnCheck · release-notes, patch
- https://getsimple-ce.ovh/CVE reference, VulnCheck · product
- https://www.vulncheck.com/advisories/getsimplecms-ce-stored-xss-via-components-phpCVE reference, VulnCheck · third-party-advisory
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.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.