XSS in 12 Step Meeting List

CVE-2026-78333

The 12 Step Meeting List WordPress plugin before 3.19.17 does not sanitise and escape a value submitted by unauthenticated users before storing it in its activity log and outputting it back in an admin area page, leading to a Stored Cross-Site Scripting issue which could be used against high privilege users such as admin.

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (41.3th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-78333: held from 0.003 to 0.005.

EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002

Affected products

  • 12 Step Meeting List

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-78333?
CVE-2026-78333 is a high-severity vulnerability in 12 Step Meeting List, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-08-27.
How severe is CVE-2026-78333?
High severity. CVSS v3 base score is 8.8 out of 10.