Security readout for executives and security teams
Plain-English summary
This is a reflected XSS issue in the WordPress s2Member plugin through version 241216. An attacker could trick a visitor or administrator into opening a crafted link, causing script to run in the trusted site context. The sources rate it high, but they do not show active exploitation.
Executive priority
Prioritize this for WordPress sites that handle memberships, payments, or administrator workflows. It is not confirmed exploited in the supplied evidence, but XSS in a trusted site can support account compromise and business-impacting changes.
Technical view
CVE-2025-26879 is CWE-79 improper input neutralization during page generation in s2Member. CVSS 3.1 is 7.1: network reachable, low complexity, no attacker privileges, user interaction required, changed scope, and low confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to WordPress sites running the s2Member plugin at version 241216 or earlier. The bundle does not provide CPEs or reliable package-version detail beyond the title and description.
Exploitation context
The CVSS vector requires user interaction, so exploitation likely depends on getting a target to follow attacker-controlled content. The CVE is not marked KEV, and the provided sources do not claim active exploitation.
Researcher notes
The bundle has a version-data inconsistency: the affected object lists version “0” and defaultStatus “unaffected,” while the title and description state affected through <= 241216. Treat the human-readable range as the working exposure signal until vendor data confirms otherwise.
Mitigation direction
- Inventory WordPress sites using the s2Member plugin.
- Check vendor or Patchstack guidance for a fixed version or recommended workaround.
- Update s2Member if an official fixed release is available.
- Disable or remove the plugin where it is not business-critical.
- Increase monitoring for suspicious WordPress admin or member-management activity.
Validation and detection
- Confirm installed s2Member versions across all WordPress properties.
- Compare versions against the affected range: through 241216.
- Review vendor and Patchstack pages for current remediation status.
- Check web logs for unusual requests targeting s2Member pages.
- Verify no compensating controls depend on untrusted reflected input.
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-2025-26879 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
- High
- CVSS
- 7.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
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.
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:R/S:C/C:L/I:L/A:L2.83.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.1HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Source materials
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.